Can anyone help me fix my custom x86EMU BIOS? \ VOGONS

Can anyone help me fix my custom x86EMU BIOS?

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First post, by superfury

Posted on 2016-07-11, 14:20

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When I boot MS-DOS normally using an external BIOS(Generic Super PC/Turbo XT BIOS v2.6) it boots without problems. But when I try to boot it with the emulator's own BIOS(which is based on Dosbox's BIOS interrupts), I see it reading some sectors from the harddisk(booting from the harddisk), but nothing appears on the screen? Is there something required missing?

Currently interrupt handlers installed in the "Normal" execution mode(currently interrupt 10h(working VGA BIOS based on Dosbox's), 11h, 12h, 13h, 15h(partly implemented), 16h(again, together with the IRQ1 handler, based on Dosbox's), 18h, 19h and 05h(dummy handler)):
https://bitbucket.org/superfury/x86emu/src/32 … upts/?at=master

Does MS-DOS need any more interrupts to boot?

Edit: When booting from a floppy disk(MS-DOS 3.3), I notice it executes interrrupt 13h function 4Fh when trying to boot? Ralf Brown's interrupt list doesn't say anything about this?

Edit: This is the int13h log I'm getting booting MS-DOS 3.3 from a floppy disk:

100:00:26:30.02638: Function 00 called.
200:00:26:30.03264: Function 02 called.
300:00:26:30.03412: Read 1/1 sectors from drive 00, start 19. Requested: Head: 1, Track: 0, Sector: 2. Start sector: 19, Destination: ES:BX=0000:00000500
400:00:26:30.03684: Function 02 called.
500:00:26:30.03800: Read 1/1 sectors from drive 00, start 33. Requested: Head: 1, Track: 0, Sector: 16. Start sector: 33, Destination: ES:BX=0000:00000700
600:00:26:30.03936: Function 02 called.
700:00:26:30.04050: Read 1/1 sectors from drive 00, start 34. Requested: Head: 1, Track: 0, Sector: 17. Start sector: 34, Destination: ES:BX=0000:00000900
800:00:26:30.06384: Function 02 called.
900:00:26:30.07002: Read 9/9 sectors from drive 00, start 1. Requested: Head: 0, Track: 0, Sector: 2. Start sector: 1, Destination: ES:BX=0800:00000000
1000:00:26:30.07288: Function 02 called.
1100:00:26:30.07404: Read 1/1 sectors from drive 00, start 33. Requested: Head: 1, Track: 0, Sector: 16. Start sector: 33, Destination: ES:BX=0070:00000000
1200:00:26:30.07754: Function 02 called.
1300:00:26:30.07866: Read 1/1 sectors from drive 00, start 34. Requested: Head: 1, Track: 0, Sector: 17. Start sector: 34, Destination: ES:BX=0070:00000200
1400:00:26:30.08216: Function 02 called.
1500:00:26:30.08340: Read 1/1 sectors from drive 00, start 35. Requested: Head: 1, Track: 0, Sector: 18. Start sector: 35, Destination: ES:BX=0070:00000400
1600:00:26:30.08676: Function 02 called.
1700:00:26:30.08792: Read 1/1 sectors from drive 00, start 36. Requested: Head: 0, Track: 1, Sector: 1. Start sector: 36, Destination: ES:BX=0070:00000600
1800:00:26:30.09136: Function 02 called.
1900:00:26:30.09252: Read 1/1 sectors from drive 00, start 37. Requested: Head: 0, Track: 1, Sector: 2. Start sector: 37, Destination: ES:BX=0070:00000800
2000:00:26:30.09588: Function 02 called.
2100:00:26:30.09704: Read 1/1 sectors from drive 00, start 38. Requested: Head: 0, Track: 1, Sector: 3. Start sector: 38, Destination: ES:BX=0070:00000A00
2200:00:26:31.00060: Function 02 called.
2300:00:26:31.00204: Read 1/1 sectors from drive 00, start 39. Requested: Head: 0, Track: 1, Sector: 4. Start sector: 39, Destination: ES:BX=0070:00000C00
2400:00:26:31.00554: Function 02 called.
2500:00:26:31.00678: Read 1/1 sectors from drive 00, start 40. Requested: Head: 0, Track: 1, Sector: 5. Start sector: 40, Destination: ES:BX=0070:00000E00
2600:00:26:31.00958: Function 02 called.
2700:00:26:31.01070: Read 1/1 sectors from drive 00, start 41. Requested: Head: 0, Track: 1, Sector: 6. Start sector: 41, Destination: ES:BX=0070:00001000
2800:00:26:31.01332: Function 02 called.
2900:00:26:31.01444: Read 1/1 sectors from drive 00, start 42. Requested: Head: 0, Track: 1, Sector: 7. Start sector: 42, Destination: ES:BX=0070:00001200
3000:00:26:31.01704: Function 02 called.
3100:00:26:31.01826: Read 1/1 sectors from drive 00, start 43. Requested: Head: 0, Track: 1, Sector: 8. Start sector: 43, Destination: ES:BX=0070:00001400
3200:00:26:31.02076: Function 02 called.
3300:00:26:31.02188: Read 1/1 sectors from drive 00, start 44. Requested: Head: 0, Track: 1, Sector: 9. Start sector: 44, Destination: ES:BX=0070:00001600
3400:00:26:31.08456: Function 02 called.
3500:00:26:31.08644: Read 1/1 sectors from drive 00, start 45. Requested: Head: 0, Track: 1, Sector: 10. Start sector: 45, Destination: ES:BX=0070:00001800
3600:00:26:31.09004: Function 02 called.
3700:00:26:31.09166: Read 1/1 sectors from drive 00, start 46. Requested: Head: 0, Track: 1, Sector: 11. Start sector: 46, Destination: ES:BX=0070:00001A00
3800:00:26:31.09508: Function 02 called.
3900:00:26:31.09646: Read 1/1 sectors from drive 00, start 47. Requested: Head: 0, Track: 1, Sector: 12. Start sector: 47, Destination: ES:BX=0070:00001C00
4000:00:26:32.00012: Function 02 called.
4100:00:26:32.00212: Read 1/1 sectors from drive 00, start 48. Requested: Head: 0, Track: 1, Sector: 13. Start sector: 48, Destination: ES:BX=0070:00001E00
4200:00:26:32.00622: Function 02 called.
4300:00:26:32.00754: Read 1/1 sectors from drive 00, start 49. Requested: Head: 0, Track: 1, Sector: 14. Start sector: 49, Destination: ES:BX=0070:00002000
4400:00:26:32.01194: Function 02 called.
4500:00:26:32.01384: Read 1/1 sectors from drive 00, start 50. Requested: Head: 0, Track: 1, Sector: 15. Start sector: 50, Destination: ES:BX=0070:00002200
4600:00:26:32.01754: Function 02 called.
4700:00:26:32.01880: Read 1/1 sectors from drive 00, start 51. Requested: Head: 0, Track: 1, Sector: 16. Start sector: 51, Destination: ES:BX=0070:00002400
4800:00:26:32.02260: Function 02 called.
4900:00:26:32.02388: Read 1/1 sectors from drive 00, start 52. Requested: Head: 0, Track: 1, Sector: 17. Start sector: 52, Destination: ES:BX=0070:00002600
5000:00:26:32.02772: Function 02 called.
5100:00:26:32.02908: Read 1/1 sectors from drive 00, start 53. Requested: Head: 0, Track: 1, Sector: 18. Start sector: 53, Destination: ES:BX=0070:00002800
5200:00:26:32.03340: Function 02 called.
5300:00:26:32.03500: Read 1/1 sectors from drive 00, start 54. Requested: Head: 1, Track: 1, Sector: 1. Start sector: 54, Destination: ES:BX=0070:00002A00
5400:00:26:33.03084: Function 02 called.
5500:00:26:33.03292: Read 1/1 sectors from drive 00, start 55. Requested: Head: 1, Track: 1, Sector: 2. Start sector: 55, Destination: ES:BX=0070:00002C00
5600:00:26:33.03660: Function 02 called.
5700:00:26:33.03788: Read 1/1 sectors from drive 00, start 56. Requested: Head: 1, Track: 1, Sector: 3. Start sector: 56, Destination: ES:BX=0070:00002E00
5800:00:26:33.04152: Function 02 called.
5900:00:26:33.04278: Read 1/1 sectors from drive 00, start 57. Requested: Head: 1, Track: 1, Sector: 4. Start sector: 57, Destination: ES:BX=0070:00003000
6000:00:26:33.04672: Function 02 called.

…Show last 52 lines

6100:00:26:33.04788: Read 1/1 sectors from drive 00, start 58. Requested: Head: 1, Track: 1, Sector: 5. Start sector: 58, Destination: ES:BX=0070:00003200
6200:00:26:33.05142: Function 02 called.
6300:00:26:33.05256: Read 1/1 sectors from drive 00, start 59. Requested: Head: 1, Track: 1, Sector: 6. Start sector: 59, Destination: ES:BX=0070:00003400
6400:00:26:33.05616: Function 02 called.
6500:00:26:33.05736: Read 1/1 sectors from drive 00, start 60. Requested: Head: 1, Track: 1, Sector: 7. Start sector: 60, Destination: ES:BX=0070:00003600
6600:00:26:33.06108: Function 02 called.
6700:00:26:33.06224: Read 1/1 sectors from drive 00, start 61. Requested: Head: 1, Track: 1, Sector: 8. Start sector: 61, Destination: ES:BX=0070:00003800
6800:00:26:33.06572: Function 02 called.
6900:00:26:33.06702: Read 1/1 sectors from drive 00, start 62. Requested: Head: 1, Track: 1, Sector: 9. Start sector: 62, Destination: ES:BX=0070:00003A00
7000:00:26:33.07100: Function 02 called.
7100:00:26:33.07214: Read 1/1 sectors from drive 00, start 63. Requested: Head: 1, Track: 1, Sector: 10. Start sector: 63, Destination: ES:BX=0070:00003C00
7200:00:26:33.07576: Function 02 called.
7300:00:26:33.07688: Read 1/1 sectors from drive 00, start 64. Requested: Head: 1, Track: 1, Sector: 11. Start sector: 64, Destination: ES:BX=0070:00003E00
7400:00:26:33.08046: Function 02 called.
7500:00:26:33.08160: Read 1/1 sectors from drive 00, start 65. Requested: Head: 1, Track: 1, Sector: 12. Start sector: 65, Destination: ES:BX=0070:00004000
7600:00:26:33.08504: Function 02 called.
7700:00:26:33.08616: Read 1/1 sectors from drive 00, start 66. Requested: Head: 1, Track: 1, Sector: 13. Start sector: 66, Destination: ES:BX=0070:00004200
7800:00:26:33.08960: Function 02 called.
7900:00:26:33.09100: Read 1/1 sectors from drive 00, start 67. Requested: Head: 1, Track: 1, Sector: 14. Start sector: 67, Destination: ES:BX=0070:00004400
8000:00:26:33.09440: Function 02 called.
8100:00:26:33.09576: Read 1/1 sectors from drive 00, start 68. Requested: Head: 1, Track: 1, Sector: 15. Start sector: 68, Destination: ES:BX=0070:00004600
8200:00:26:33.09928: Function 02 called.
8300:00:26:34.00052: Read 1/1 sectors from drive 00, start 69. Requested: Head: 1, Track: 1, Sector: 16. Start sector: 69, Destination: ES:BX=0070:00004800
8400:00:26:34.00400: Function 02 called.
8500:00:26:34.00532: Read 1/1 sectors from drive 00, start 70. Requested: Head: 1, Track: 1, Sector: 17. Start sector: 70, Destination: ES:BX=0070:00004A00
8600:00:26:34.00896: Function 02 called.
8700:00:26:34.01026: Read 1/1 sectors from drive 00, start 71. Requested: Head: 1, Track: 1, Sector: 18. Start sector: 71, Destination: ES:BX=0070:00004C00
8800:00:26:34.01360: Function 02 called.
8900:00:26:34.01484: Read 1/1 sectors from drive 00, start 72. Requested: Head: 0, Track: 2, Sector: 1. Start sector: 72, Destination: ES:BX=0070:00004E00
9000:00:26:34.01836: Function 02 called.
9100:00:26:34.01954: Read 1/1 sectors from drive 00, start 73. Requested: Head: 0, Track: 2, Sector: 2. Start sector: 73, Destination: ES:BX=0070:00005000
9200:00:26:34.02288: Function 02 called.
9300:00:26:34.02408: Read 1/1 sectors from drive 00, start 74. Requested: Head: 0, Track: 2, Sector: 3. Start sector: 74, Destination: ES:BX=0070:00005200
9400:00:26:34.02748: Function 02 called.
9500:00:26:34.02864: Read 1/1 sectors from drive 00, start 75. Requested: Head: 0, Track: 2, Sector: 4. Start sector: 75, Destination: ES:BX=0070:00005400
9600:00:26:34.03200: Function 02 called.
9700:00:26:34.03314: Read 1/1 sectors from drive 00, start 76. Requested: Head: 0, Track: 2, Sector: 5. Start sector: 76, Destination: ES:BX=0070:00005600
9800:00:26:34.03648: Function 02 called.
9900:00:26:34.03760: Read 1/1 sectors from drive 00, start 77. Requested: Head: 0, Track: 2, Sector: 6. Start sector: 77, Destination: ES:BX=0070:00005800
10000:00:26:34.04126: Function 02 called.
10100:00:26:34.04240: Read 1/1 sectors from drive 00, start 78. Requested: Head: 0, Track: 2, Sector: 7. Start sector: 78, Destination: ES:BX=0070:00005A00
10200:00:26:34.04584: Function 02 called.
10300:00:26:34.04696: Read 1/1 sectors from drive 00, start 79. Requested: Head: 0, Track: 2, Sector: 8. Start sector: 79, Destination: ES:BX=0070:00005C00
10400:00:26:34.05040: Function 02 called.
10500:00:26:34.05150: Read 1/1 sectors from drive 00, start 80. Requested: Head: 0, Track: 2, Sector: 9. Start sector: 80, Destination: ES:BX=0070:00005E00
10600:00:26:34.05486: Function 02 called.
10700:00:26:34.05632: Read 1/1 sectors from drive 00, start 81. Requested: Head: 0, Track: 2, Sector: 10. Start sector: 81, Destination: ES:BX=0070:00006000
10800:00:26:34.05988: Function 02 called.
10900:00:26:34.06110: Read 1/1 sectors from drive 00, start 82. Requested: Head: 0, Track: 2, Sector: 11. Start sector: 82, Destination: ES:BX=0070:00006200
11000:00:26:34.06434: Function 02 called.
11100:00:26:34.06568: Read 1/1 sectors from drive 00, start 83. Requested: Head: 0, Track: 2, Sector: 12. Start sector: 83, Destination: ES:BX=0070:00006400

Since I'm pretty sure the CPU emulation is correct(since it already can run a lot of things, including 8088 MPH demo without crashing in any way using a real BIOS(Super PC/Turbo XT BIOS v2.6)), there muse be an error in the other factor faked by my emulator: The BIOS interrupts themselves.

Anyone can see what's going wrong here? peterferrie?

Last edited by superfury on 2016-07-12, 05:06. Edited 1 time in total.

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Reply 1 of 14, by peterferrie

Posted on 2016-07-11, 20:54

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I'll try to look tomorrow. Too many meetings today.

Reply 2 of 14, by peterferrie

Posted on 2016-07-12, 16:52

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I don't see function 4F in your log, nor do I see it in boot sequence. When did you see it appear?
In any case, your int 13 log matches what DOS 3.3 does during boot. After the read completes, there are calls to int 11h, 15h, and only then is text printed via int 10h.
Can you give more detail about what's different in your environment?

unrelated: best way to get my attention is PM. I just happened to check this post. I don't read them all.

Reply 3 of 14, by superfury

Posted on 2016-07-12, 17:48

superfury Offline

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I see the calls to int 15h at least, but no calls to int 10h?

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Reply 4 of 14, by peterferrie

Posted on 2016-07-12, 20:14

peterferrie Offline

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That's interesting.
At 0070:3514 is a call to int 11h.
At 0070:354C is a call to int 15h with ah=C0h. This is the first call to int 15h.
At 0070:3578 is a call to 0070:41C0.
At 0070:41D2 is the call to int 10h with ah=0Eh, and printing the "NEC IO.SYS for MS-DOS (R) Version 3.30" text.
Do you reach any or all of those points?

Reply 5 of 14, by superfury

Posted on 2016-07-13, 05:08

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Well, I know that it isn't printing that text on the screen(or anything at all). I'll have to debug the INT calls if I want to find out anything more. I do remember a call to interrupt 15h, which resulted in a invalid bootdisk-type message(I believe it was some kind of bootfiles not found error) because of my int 15h handler. I had to add a "RETF 2" instruction into the int 15h handler(see interrupt15.c), according to found documentation, which prevents a normal IRET. Or is that only for the keyboard decoder subfunction(4Fh)? Is that correct?

1void BIOS_int15()
2{
3	switch (REG_AH) //What function?
4	{
5	case 0xC0: //Get configuration?
6		REG_AH = 0x00; //Supported!
7		CALLBACK_SCF(0); //Set carry flag to indicate an error!
8		MMU_ww(CPU_SEGMENT_ES, REG_ES, REG_BX, 8); //8 bytes following!
9		switch (EMULATED_CPU) //What CPU are we emulating?
10		{
11		case 0: //8086?
12			MMU_wb(CPU_SEGMENT_ES, REG_ES, REG_BX + 0x02, 0xFB); //PC/XT!
13			break;
14		case 1: //NECV30?
15			MMU_wb(CPU_SEGMENT_ES, REG_ES, REG_BX + 0x02, 0xFB); //PC/XT!
16			break;
17		case 2: //80286?
18		case 3: //80386?
19		case 4: //80486?
20		case 5: //Pentium?
21			MMU_wb(CPU_SEGMENT_ES, REG_ES, REG_BX + 0x02, 0xF8); //386 or higher CPU!
22			break;
23		}
24		MMU_wb(CPU_SEGMENT_ES, REG_ES, REG_BX + 0x03, 0x00); //Unknown submodel!
25		MMU_wb(CPU_SEGMENT_ES, REG_ES, REG_BX + 0x04, 0x01); //First BIOS revision!
26		MMU_wb(CPU_SEGMENT_ES, REG_ES, REG_BX + 0x05, 0x40|0x20); //We have 2nd PIC and RTC!
27		MMU_wb(CPU_SEGMENT_ES, REG_ES, REG_BX + 0x06, 0x00); //No extra hardware!
28		MMU_wb(CPU_SEGMENT_ES, REG_ES, REG_BX + 0x07, 0x00); //No extra support!
29		MMU_wb(CPU_SEGMENT_ES, REG_ES, REG_BX + 0x08, 0x00); //No extra support!
30		MMU_wb(CPU_SEGMENT_ES, REG_ES, REG_BX + 0x09, 0x00); //No enhanced mouse mode or Flash BIOS!
31		break;
32	case 0x4F: //Translate scan code?
33		CALLBACK_SCF(0);
34		break;
35	default: //Unknown function? 
36		REG_AH = 0x86; //Not supported!
37		CALLBACK_SCF(1); //Set carry flag to indicate an error!
38		break;
39	}
40	external8086RETF(2); //RETF 2 simulated!
41}

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Reply 6 of 14, by Jepael

Posted on 2016-07-13, 20:05

Jepael Offline

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superfury wrote:
Well, I know that it isn't printing that text on the screen(or anything at all). I'll have to debug the INT calls if I want to find out anything more. I do remember a call to interrupt 15h, which resulted in a invalid bootdisk-type message(I believe it was some kind of bootfiles not found error) because of my int 15h handler. I had to add a "RETF 2" instruction into the int 15h handler(see interrupt15.c), according to found documentation, which prevents a normal IRET. Or is that only for the keyboard decoder subfunction(4Fh)? Is that correct?

If that code is called by invoking "int 15h" which clears interrupt flag and jumps to execute the vector, then normally "IRET" is used to restore the flags as they were which will also enable interrupts if they were enabled before invoking int15h. Your "RETF 2" trick won't pop the flags so interrupts stay disabled after invoking "int 15h".

Some int15 routines run with interrupts enabled and some disabled, but the first thing in int 15 handler is STI to enable interrupts again. Further subroutines then use CLI/STI as they need, but will do STI before returning with "RETF 2".

If you do "STI", you are free to change flags and indicate success/error with STC/CLC before "RETF 2".

Reply 7 of 14, by superfury

Posted on 2016-07-13, 21:49

superfury Offline

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Well, those returning flags on the stack are changed by callback_scf, which pops the flags, modifies CF, then writes it back on the stack, with the stack address being used depending on callback method(zero callback(call) vs normal interrupt(int):

1 //Flag set/reset for interrupts called by callbacks. Compatible with both callback calls and normal calls.
2
3uint_32 FLAGS_offset()
4{
5	return REG_SP+4+(callbackzero<<2); //Apply zero callback if needed (call adds 4 bytes to stack)!
6}
7
8void CALLBACK_SZF(byte val) {
9	uint_32 flags=0;
10	if (EMU_RUNNING == 1)
11	{
12		flags = REG_EFLAGS; //Read flags!
13		REG_EFLAGS = MMU_rw(CPU_SEGMENT_SS, REG_SS, FLAGS_offset(), 0);
14	}
15	if (val) FLAG_ZF = 1;
16	else FLAG_ZF = 0; 
17	if (EMU_RUNNING==1)
18	{
19		MMU_ww(CPU_SEGMENT_SS, REG_SS, FLAGS_offset(), REG_EFLAGS);
20		REG_EFLAGS = flags; //Restore!
21	}
22}
23
24void CALLBACK_SCF(byte val) {
25	uint_32 flags=0;
26	if (EMU_RUNNING == 1)
27	{
28		flags = REG_EFLAGS; //Read flags!
29		REG_EFLAGS = MMU_rw(CPU_SEGMENT_SS, REG_SS, FLAGS_offset(), 0);
30	}
31	if (val) FLAG_CF = 1;
32	else FLAG_CF = 0; 
33	if (EMU_RUNNING==1)
34	{
35		MMU_ww(CPU_SEGMENT_SS, REG_SS, FLAGS_offset(), REG_EFLAGS);
36		REG_EFLAGS = flags; //Restore!
37	}
38}
39
40void CALLBACK_SIF(byte val) {
41	uint_32 flags=0;
42	if (EMU_RUNNING == 1)
43	{
44		flags = REG_EFLAGS; //Read flags!
45		REG_EFLAGS = MMU_rw(CPU_SEGMENT_SS, REG_SS, FLAGS_offset(), 0);
46	}
47	if (val) FLAG_IF = 1;
48	else FLAG_IF = 0; 
49	if (EMU_RUNNING==1)
50	{
51		MMU_ww(CPU_SEGMENT_SS, REG_SS, FLAGS_offset(), REG_EFLAGS);
52		REG_EFLAGS = flags; //Restore!
53	}
54}

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Reply 8 of 14, by Jepael

Posted on 2016-07-13, 22:42

Jepael Offline

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superfury wrote:
Well, those returning flags on the stack are changed by callback_scf, which pops the flags, modifies CF, then writes it back on the stack, with the stack address being used depending on callback method(zero callback(call) vs normal interrupt(int):

I hope during that int15h C function the CPU_RUNNING is 0, as it would not make any sense to change the flags in the stack.

The problem still is:
opcodes CD 15 (INT 15H invocation) pushes flags, CS and IP, disables IF and TF, loads IP and CS from IVT and jumps there to execute (your trap for the interrupt).
RETF 2 just pops IP and CS and skips flags by adjusting SP by 2, resuming execution right after the CD 15 opcodes. But nothing has enabled IF back, ever.

Reply 9 of 14, by peterferrie

Posted on 2016-07-14, 00:18

peterferrie Offline

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If you can post some execution logs from around the time of the int 15h call, the problem might be easier to solve.
The flow from the int 15h call until the int 10h call is linear, so if you hit the first, you should also hit the second, unless your code is being diverted by something else (there's an sti shortly before the int 15h call, perhaps an interrupt is occurring and never returning?).

Reply 10 of 14, by superfury

Posted on 2016-07-14, 08:15

superfury Offline

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Location: Netherlands

Well, simply looking at the code reveals:
EMU_RUNNING should be 1: The emulator CPU is running after all(not executing the BIOS Setting Menu or debugging, which pause the execution).
CALLBACK_SCF and CALLBACK_SIF should apply their changes both to the current flags on the stack and active flags(so it has correct effect on both IRET-returned and RETF 2-returned code: The EMU_RUNNING flags ensure that the stack is changed correctly. The FLAG_CF and FLAG_IF themselves change the result stored back onto the stack as well as the active flags, which stay that value, even after a RETF 2 instruction).
So the flags should be returned correctly both with IRET and RETF 2 instructions, as long as the stack position (SP+4+(4 when zero callback)) contains a valid copy of the flags, whether it's used or not.

So after the INT 15h function C0h, the carry flag in memory(might be unused by code) should be cleared, as well as in the flags register. The return address should have the correct flags anyway, with the structure at ES:BX being filled with it's 10 bytes of data. AH should be 00h.

Edit: I've made a little log using a new debugger logging mode i've implemented, which only logs INT instructions:

100:00:13:71.03866: 0000:7C6E (CD13)INT 13
200:00:13:71.04067: Registers:
300:00:13:71.04076: AX: 0000, BX: 0078, CX: 0000, DX: 0000
400:00:13:71.04083: CS: 0000, DS: 0000, ES: 0000, SS: 0000
500:00:13:71.04091: SP: 7BF8, BP: 0000, SI: 014B, DI: 7C36
600:00:13:71.04096: IP: 7C6E, FLAGS: F246
700:00:13:71.04104: FLAGSINFO:c1P0a0ZstIdo1111 
800:00:13:71.04113: Interrupt status: 0000000000000010
900:00:13:71.04118: VGA@84,360(CRT:111,419)
1000:00:13:71.04122: Display=712,446
11
1200:00:13:71.04217: Function 00 called.
1300:00:13:71.04960: 0000:7D74 (CD13)INT 13
1400:00:13:71.04963: Registers:
1500:00:13:71.04971: AX: 0201, BX: 0500, CX: 0002, DX: 0100
1600:00:13:71.04978: CS: 0000, DS: 0000, ES: 0000, SS: 0000
1700:00:13:71.04986: SP: 7BF4, BP: 0000, SI: 014B, DI: 7C36
1800:00:13:71.04991: IP: 7D74, FLAGS: F202
1900:00:13:71.04999: FLAGSINFO:c1p0a0zstIdo1111 
2000:00:13:71.05008: Interrupt status: 0000000000000010
2100:00:13:71.05015: VGA@487,365(CRT:514,424)
2200:00:13:71.05032: Display=712,446
23
2400:00:13:71.05122: Function 02 called.
2500:00:13:71.05245: Read 1/1 sectors from drive 00, start 19. Requested: Head: 1, Track: 0, Sector: 2. Start sector: 19, Destination: ES:BX=0000:00000500
2600:00:13:71.05964: 0000:7D74 (CD13)INT 13
2700:00:13:71.05967: Registers:
2800:00:13:71.05975: AX: 0201, BX: 0700, CX: 0010, DX: 0100
2900:00:13:71.05983: CS: 0000, DS: 0000, ES: 0000, SS: 0000
3000:00:13:71.05990: SP: 7BF4, BP: 0000, SI: 7DF6, DI: 052B
3100:00:13:71.05995: IP: 7D74, FLAGS: F202
3200:00:13:71.06015: FLAGSINFO:c1p0a0zstIdo1111 
3300:00:13:71.06025: Interrupt status: 0000000000000010
3400:00:13:71.06030: VGA@130,371(CRT:157,430)
3500:00:13:71.06034: Display=712,446
36
3700:00:13:71.06150: Function 02 called.
3800:00:13:71.06263: Read 1/1 sectors from drive 00, start 33. Requested: Head: 1, Track: 0, Sector: 16. Start sector: 33, Destination: ES:BX=0000:00000700
3900:00:13:71.06663: 0000:7D74 (CD13)INT 13
4000:00:13:71.06666: Registers:
4100:00:13:71.06674: AX: 0201, BX: 0900, CX: 0011, DX: 0100
4200:00:13:71.06681: CS: 0000, DS: 0000, ES: 0000, SS: 0000
4300:00:13:71.06689: SP: 7BF4, BP: 0000, SI: 7DF6, DI: 052B
4400:00:13:71.06694: IP: 7D74, FLAGS: F206
4500:00:13:71.06702: FLAGSINFO:c1P0a0zstIdo1111 
4600:00:13:71.06712: Interrupt status: 0000000000000010
4700:00:13:71.06717: VGA@353,373(CRT:380,432)
4800:00:13:71.06721: Display=712,446
49
5000:00:13:71.06800: Function 02 called.
5100:00:13:71.06911: Read 1/1 sectors from drive 00, start 34. Requested: Head: 1, Track: 0, Sector: 17. Start sector: 34, Destination: ES:BX=0000:00000900
5200:00:13:73.04073: 0000:7E03 (CD13)INT 13
5300:00:13:73.04079: Registers:
5400:00:13:73.04089: AX: 0209, BX: 0000, CX: 0002, DX: 0000
5500:00:13:73.04098: CS: 0000, DS: 0000, ES: 0800, SS: 0000
5600:00:13:73.04105: SP: 7BDA, BP: 7BE2, SI: 0009, DI: 0000
5700:00:13:73.04110: IP: 7E03, FLAGS: F202
5800:00:13:73.04120: FLAGSINFO:c1p0a0zstIdo1111 
5900:00:13:73.04132: Interrupt status: 0000000000000010
6000:00:13:73.04137: VGA@97,424(CRT:124,10)

…Show last 690 lines

6100:00:13:73.04141: Display=801,471
62
6300:00:13:73.04247: Function 02 called.
6400:00:13:73.05185: Read 9/9 sectors from drive 00, start 1. Requested: Head: 0, Track: 0, Sector: 2. Start sector: 1, Destination: ES:BX=0800:00000000
6500:00:13:73.06000: 0000:7E03 (CD13)INT 13
6600:00:13:73.06003: Registers:
6700:00:13:73.06011: AX: 0201, BX: 0000, CX: 0010, DX: 0100
6800:00:13:73.06050: CS: 0000, DS: 0000, ES: 0070, SS: 0000
6900:00:13:73.06058: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 0000
7000:00:13:73.06063: IP: 7E03, FLAGS: F202
7100:00:13:73.06071: FLAGSINFO:c1p0a0zstIdo1111 
7200:00:13:73.06090: Interrupt status: 0000000000000010
7300:00:13:73.06106: VGA@573,429(CRT:600,15)
7400:00:13:73.06110: Display=801,471
75
7600:00:13:73.06197: Function 02 called.
7700:00:13:73.06324: Read 1/1 sectors from drive 00, start 33. Requested: Head: 1, Track: 0, Sector: 16. Start sector: 33, Destination: ES:BX=0070:00000000
7800:00:13:73.07316: 0000:7E03 (CD13)INT 13
7900:00:13:73.07320: Registers:
8000:00:13:73.07328: AX: 0201, BX: 0200, CX: 0011, DX: 0100
8100:00:13:73.07335: CS: 0000, DS: 0000, ES: 0070, SS: 0000
8200:00:13:73.07343: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 0200
8300:00:13:73.07418: IP: 7E03, FLAGS: F206
8400:00:13:73.07427: FLAGSINFO:c1P0a0zstIdo1111 
8500:00:13:73.07436: Interrupt status: 0000000000000010
8600:00:13:73.07441: VGA@7,437(CRT:34,23)
8700:00:13:73.07445: Display=801,471
88
8900:00:13:73.07533: Function 02 called.
9000:00:13:73.07650: Read 1/1 sectors from drive 00, start 34. Requested: Head: 1, Track: 0, Sector: 17. Start sector: 34, Destination: ES:BX=0070:00000200
9100:00:13:73.08817: 0000:7E03 (CD13)INT 13
9200:00:13:73.08821: Registers:
9300:00:13:73.08830: AX: 0201, BX: 0400, CX: 0012, DX: 0100
9400:00:13:73.08842: CS: 0000, DS: 0000, ES: 0070, SS: 0000
9500:00:13:73.08850: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 0400
9600:00:13:73.08855: IP: 7E03, FLAGS: F206
9700:00:13:73.08865: FLAGSINFO:c1P0a0zstIdo1111 
9800:00:13:73.08877: Interrupt status: 0000000000000010
9900:00:13:73.08882: VGA@318,444(CRT:345,30)
10000:00:13:73.08886: Display=801,471
101
10200:00:13:73.08980: Function 02 called.
10300:00:13:73.09156: Read 1/1 sectors from drive 00, start 35. Requested: Head: 1, Track: 0, Sector: 18. Start sector: 35, Destination: ES:BX=0070:00000400
10400:00:13:74.00169: 0000:7E03 (CD13)INT 13
10500:00:13:74.00172: Registers:
10600:00:13:74.00180: AX: 0201, BX: 0600, CX: 0101, DX: 0000
10700:00:13:74.00188: CS: 0000, DS: 0000, ES: 0070, SS: 0000
10800:00:13:74.00196: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 0600
10900:00:13:74.00201: IP: 7E03, FLAGS: F202
11000:00:13:74.00209: FLAGSINFO:c1p0a0zstIdo1111 
11100:00:13:74.00218: Interrupt status: 0000000000000010
11200:00:13:74.00223: VGA@656,3(CRT:683,37)
11300:00:13:74.00227: Display=801,471
114
11500:00:13:74.00306: Function 02 called.
11600:00:13:74.00421: Read 1/1 sectors from drive 00, start 36. Requested: Head: 0, Track: 1, Sector: 1. Start sector: 36, Destination: ES:BX=0070:00000600
11700:00:13:74.01665: 0000:7E03 (CD13)INT 13
11800:00:13:74.01669: Registers:
11900:00:13:74.01677: AX: 0201, BX: 0800, CX: 0102, DX: 0000
12000:00:13:74.01684: CS: 0000, DS: 0000, ES: 0070, SS: 0000
12100:00:13:74.01692: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 0800
12200:00:13:74.01697: IP: 7E03, FLAGS: F202
12300:00:13:74.01705: FLAGSINFO:c1p0a0zstIdo1111 
12400:00:13:74.01715: Interrupt status: 0000000000000010
12500:00:13:74.01720: VGA@76,11(CRT:103,45)
12600:00:13:74.01724: Display=801,471
127
12800:00:13:74.01806: Function 02 called.
12900:00:13:74.01923: Read 1/1 sectors from drive 00, start 37. Requested: Head: 0, Track: 1, Sector: 2. Start sector: 37, Destination: ES:BX=0070:00000800
13000:00:13:74.03017: 0000:7E03 (CD13)INT 13
13100:00:13:74.03030: Registers:
13200:00:13:74.03039: AX: 0201, BX: 0A00, CX: 0103, DX: 0000
13300:00:13:74.03047: CS: 0000, DS: 0000, ES: 0070, SS: 0000
13400:00:13:74.03055: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 0A00
13500:00:13:74.03068: IP: 7E03, FLAGS: F206
13600:00:13:74.03077: FLAGSINFO:c1P0a0zstIdo1111 
13700:00:13:74.03086: Interrupt status: 0000000000000010
13800:00:13:74.03091: VGA@419,18(CRT:446,52)
13900:00:13:74.03095: Display=801,471
140
14100:00:13:74.03176: Function 02 called.
14200:00:13:74.03294: Read 1/1 sectors from drive 00, start 38. Requested: Head: 0, Track: 1, Sector: 3. Start sector: 38, Destination: ES:BX=0070:00000A00
14300:00:13:74.04485: 0000:7E03 (CD13)INT 13
14400:00:13:74.04489: Registers:
14500:00:13:74.04497: AX: 0201, BX: 0C00, CX: 0104, DX: 0000
14600:00:13:74.04506: CS: 0000, DS: 0000, ES: 0070, SS: 0000
14700:00:13:74.04519: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 0C00
14800:00:13:74.04525: IP: 7E03, FLAGS: F202
14900:00:13:74.04533: FLAGSINFO:c1p0a0zstIdo1111 
15000:00:13:74.04544: Interrupt status: 0000000000000010
15100:00:13:74.04552: VGA@747,25(CRT:774,59)
15200:00:13:74.04556: Display=801,471
153
15400:00:13:74.04641: Function 02 called.
15500:00:13:74.04757: Read 1/1 sectors from drive 00, start 39. Requested: Head: 0, Track: 1, Sector: 4. Start sector: 39, Destination: ES:BX=0070:00000C00
15600:00:13:74.05941: 0000:7E03 (CD13)INT 13
15700:00:13:74.05945: Registers:
15800:00:13:74.05953: AX: 0201, BX: 0E00, CX: 0105, DX: 0000
15900:00:13:74.05961: CS: 0000, DS: 0000, ES: 0070, SS: 0000
16000:00:13:74.05969: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 0E00
16100:00:13:74.05974: IP: 7E03, FLAGS: F206
16200:00:13:74.06065: FLAGSINFO:c1P0a0zstIdo1111 
16300:00:13:74.06081: Interrupt status: 0000000000000010
16400:00:13:74.06089: VGA@187,33(CRT:214,67)
16500:00:13:74.06095: Display=801,471
166
16700:00:13:74.06269: Function 02 called.
16800:00:13:74.06465: Read 1/1 sectors from drive 00, start 40. Requested: Head: 0, Track: 1, Sector: 5. Start sector: 40, Destination: ES:BX=0070:00000E00
16900:00:13:74.08082: 0000:7E03 (CD13)INT 13
17000:00:13:74.08086: Registers:
17100:00:13:74.08094: AX: 0201, BX: 1000, CX: 0106, DX: 0000
17200:00:13:74.08102: CS: 0000, DS: 0000, ES: 0070, SS: 0000
17300:00:13:74.08110: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 1000
17400:00:13:74.08115: IP: 7E03, FLAGS: F206
17500:00:13:74.08124: FLAGSINFO:c1P0a0zstIdo1111 
17600:00:13:74.08134: Interrupt status: 0000000000000010
17700:00:13:74.08139: VGA@507,40(CRT:534,74)
17800:00:13:74.08143: Display=801,471
179
18000:00:13:74.08224: Function 02 called.
18100:00:13:74.08377: Read 1/1 sectors from drive 00, start 41. Requested: Head: 0, Track: 1, Sector: 6. Start sector: 41, Destination: ES:BX=0070:00001000
18200:00:13:74.09496: 0000:7E03 (CD13)INT 13
18300:00:13:74.09500: Registers:
18400:00:13:74.09508: AX: 0201, BX: 1200, CX: 0107, DX: 0000
18500:00:13:74.09529: CS: 0000, DS: 0000, ES: 0070, SS: 0000
18600:00:13:74.09538: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 1200
18700:00:13:74.09543: IP: 7E03, FLAGS: F202
18800:00:13:74.09551: FLAGSINFO:c1p0a0zstIdo1111 
18900:00:13:74.09570: Interrupt status: 0000000000000010
19000:00:13:74.09575: VGA@850,48(CRT:0,82)
19100:00:13:74.09579: Display=801,471
192
19300:00:13:74.09664: Function 02 called.
19400:00:13:74.09939: Read 1/1 sectors from drive 00, start 42. Requested: Head: 0, Track: 1, Sector: 7. Start sector: 42, Destination: ES:BX=0070:00001200
19500:00:13:75.01006: 0000:7E03 (CD13)INT 13
19600:00:13:75.01009: Registers:
19700:00:13:75.01022: AX: 0201, BX: 1400, CX: 0108, DX: 0000
19800:00:13:75.01063: CS: 0000, DS: 0000, ES: 0070, SS: 0000
19900:00:13:75.01080: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 1400
20000:00:13:75.01085: IP: 7E03, FLAGS: F202
20100:00:13:75.01093: FLAGSINFO:c1p0a0zstIdo1111 
20200:00:13:75.01103: Interrupt status: 0000000000000010
20300:00:13:75.01108: VGA@278,55(CRT:305,89)
20400:00:13:75.01112: Display=801,471
205
20600:00:13:75.01204: Function 02 called.
20700:00:13:75.01324: Read 1/1 sectors from drive 00, start 43. Requested: Head: 0, Track: 1, Sector: 8. Start sector: 43, Destination: ES:BX=0070:00001400
20800:00:13:75.02442: 0000:7E03 (CD13)INT 13
20900:00:13:75.02446: Registers:
21000:00:13:75.02453: AX: 0201, BX: 1600, CX: 0109, DX: 0000
21100:00:13:75.02461: CS: 0000, DS: 0000, ES: 0070, SS: 0000
21200:00:13:75.02469: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 1600
21300:00:13:75.02474: IP: 7E03, FLAGS: F206
21400:00:13:75.02482: FLAGSINFO:c1P0a0zstIdo1111 
21500:00:13:75.02491: Interrupt status: 0000000000000010
21600:00:13:75.02497: VGA@625,62(CRT:652,96)
21700:00:13:75.02500: Display=801,471
218
21900:00:13:75.02615: Function 02 called.
22000:00:13:75.02730: Read 1/1 sectors from drive 00, start 44. Requested: Head: 0, Track: 1, Sector: 9. Start sector: 44, Destination: ES:BX=0070:00001600
22100:00:13:75.03761: 0000:7E03 (CD13)INT 13
22200:00:13:75.03764: Registers:
22300:00:13:75.03772: AX: 0201, BX: 1800, CX: 010A, DX: 0000
22400:00:13:75.03780: CS: 0000, DS: 0000, ES: 0070, SS: 0000
22500:00:13:75.03787: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 1800
22600:00:13:75.03792: IP: 7E03, FLAGS: F206
22700:00:13:75.03800: FLAGSINFO:c1P0a0zstIdo1111 
22800:00:13:75.03810: Interrupt status: 0000000000000010
22900:00:13:75.03815: VGA@53,70(CRT:80,104)
23000:00:13:75.03819: Display=801,471
231
23200:00:13:75.03900: Function 02 called.
23300:00:13:75.04015: Read 1/1 sectors from drive 00, start 45. Requested: Head: 0, Track: 1, Sector: 10. Start sector: 45, Destination: ES:BX=0070:00001800
23400:00:13:75.05078: 0000:7E03 (CD13)INT 13
23500:00:13:75.05081: Registers:
23600:00:13:75.05089: AX: 0201, BX: 1A00, CX: 010B, DX: 0000
23700:00:13:75.05097: CS: 0000, DS: 0000, ES: 0070, SS: 0000
23800:00:13:75.05104: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 1A00
23900:00:13:75.05109: IP: 7E03, FLAGS: F202
24000:00:13:75.05118: FLAGSINFO:c1p0a0zstIdo1111 
24100:00:13:75.05127: Interrupt status: 0000000000000010
24200:00:13:75.05144: VGA@405,77(CRT:432,111)
24300:00:13:75.05147: Display=801,471
244
24500:00:13:75.05229: Function 02 called.
24600:00:13:75.05343: Read 1/1 sectors from drive 00, start 46. Requested: Head: 0, Track: 1, Sector: 11. Start sector: 46, Destination: ES:BX=0070:00001A00
24700:00:13:75.06471: 0000:7E03 (CD13)INT 13
24800:00:13:75.06474: Registers:
24900:00:13:75.06482: AX: 0201, BX: 1C00, CX: 010C, DX: 0000
25000:00:13:75.06490: CS: 0000, DS: 0000, ES: 0070, SS: 0000
25100:00:13:75.06497: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 1C00
25200:00:13:75.06502: IP: 7E03, FLAGS: F206
25300:00:13:75.06510: FLAGSINFO:c1P0a0zstIdo1111 
25400:00:13:75.06525: Interrupt status: 0000000000000010
25500:00:13:75.06539: VGA@742,84(CRT:769,118)
25600:00:13:75.06543: Display=801,471
257
25800:00:13:76.04886: Function 02 called.
25900:00:13:76.05020: Read 1/1 sectors from drive 00, start 47. Requested: Head: 0, Track: 1, Sector: 12. Start sector: 47, Destination: ES:BX=0070:00001C00
26000:00:13:76.06328: 0000:7E03 (CD13)INT 13
26100:00:13:76.06331: Registers:
26200:00:13:76.06339: AX: 0201, BX: 1E00, CX: 010D, DX: 0000
26300:00:13:76.06346: CS: 0000, DS: 0000, ES: 0070, SS: 0000
26400:00:13:76.06354: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 1E00
26500:00:13:76.06359: IP: 7E03, FLAGS: F202
26600:00:13:76.06366: FLAGSINFO:c1p0a0zstIdo1111 
26700:00:13:76.06376: Interrupt status: 0000000000000010
26800:00:13:76.06381: VGA@185,92(CRT:212,126)
26900:00:13:76.06385: Display=801,471
270
27100:00:13:76.06466: Function 02 called.
27200:00:13:76.06619: Read 1/1 sectors from drive 00, start 48. Requested: Head: 0, Track: 1, Sector: 13. Start sector: 48, Destination: ES:BX=0070:00001E00
27300:00:13:76.07682: 0000:7E03 (CD13)INT 13
27400:00:13:76.07685: Registers:
27500:00:13:76.07693: AX: 0201, BX: 2000, CX: 010E, DX: 0000
27600:00:13:76.07700: CS: 0000, DS: 0000, ES: 0070, SS: 0000
27700:00:13:76.07708: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 2000
27800:00:13:76.07712: IP: 7E03, FLAGS: F202
27900:00:13:76.07720: FLAGSINFO:c1p0a0zstIdo1111 
28000:00:13:76.07730: Interrupt status: 0000000000000010
28100:00:13:76.07735: VGA@505,99(CRT:532,133)
28200:00:13:76.07739: Display=801,471
283
28400:00:13:76.07817: Function 02 called.
28500:00:13:76.07931: Read 1/1 sectors from drive 00, start 49. Requested: Head: 0, Track: 1, Sector: 14. Start sector: 49, Destination: ES:BX=0070:00002000
28600:00:13:76.08991: 0000:7E03 (CD13)INT 13
28700:00:13:76.08994: Registers:
28800:00:13:76.09002: AX: 0201, BX: 2200, CX: 010F, DX: 0000
28900:00:13:76.09010: CS: 0000, DS: 0000, ES: 0070, SS: 0000
29000:00:13:76.09031: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 2200
29100:00:13:76.09036: IP: 7E03, FLAGS: F206
29200:00:13:76.09045: FLAGSINFO:c1P0a0zstIdo1111 
29300:00:13:76.09054: Interrupt status: 0000000000000010
29400:00:13:76.09059: VGA@848,107(CRT:0,141)
29500:00:13:76.09063: Display=801,471
296
29700:00:13:76.09158: Function 02 called.
29800:00:13:76.09271: Read 1/1 sectors from drive 00, start 50. Requested: Head: 0, Track: 1, Sector: 15. Start sector: 50, Destination: ES:BX=0070:00002200
29900:00:13:77.00320: 0000:7E03 (CD13)INT 13
30000:00:13:77.00323: Registers:
30100:00:13:77.00331: AX: 0201, BX: 2400, CX: 0110, DX: 0000
30200:00:13:77.00339: CS: 0000, DS: 0000, ES: 0070, SS: 0000
30300:00:13:77.00346: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 2400
30400:00:13:77.00351: IP: 7E03, FLAGS: F202
30500:00:13:77.00359: FLAGSINFO:c1p0a0zstIdo1111 
30600:00:13:77.00368: Interrupt status: 0000000000000010
30700:00:13:77.00374: VGA@276,114(CRT:303,148)
30800:00:13:77.00377: Display=801,471
309
31000:00:13:77.00457: Function 02 called.
31100:00:13:77.00614: Read 1/1 sectors from drive 00, start 51. Requested: Head: 0, Track: 1, Sector: 16. Start sector: 51, Destination: ES:BX=0070:00002400
31200:00:13:77.01901: 0000:7E03 (CD13)INT 13
31300:00:13:77.01905: Registers:
31400:00:13:77.01913: AX: 0201, BX: 2600, CX: 0111, DX: 0000
31500:00:13:77.01921: CS: 0000, DS: 0000, ES: 0070, SS: 0000
31600:00:13:77.01928: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 2600
31700:00:13:77.01933: IP: 7E03, FLAGS: F206
31800:00:13:77.01942: FLAGSINFO:c1P0a0zstIdo1111 
31900:00:13:77.01951: Interrupt status: 0000000000000010
32000:00:13:77.01957: VGA@623,121(CRT:650,155)
32100:00:13:77.01972: Display=801,471
322
32300:00:13:77.02082: Function 02 called.
32400:00:13:77.02344: Read 1/1 sectors from drive 00, start 52. Requested: Head: 0, Track: 1, Sector: 17. Start sector: 52, Destination: ES:BX=0070:00002600
32500:00:13:77.03487: 0000:7E03 (CD13)INT 13
32600:00:13:77.03491: Registers:
32700:00:13:77.03499: AX: 0201, BX: 2800, CX: 0112, DX: 0000
32800:00:13:77.03507: CS: 0000, DS: 0000, ES: 0070, SS: 0000
32900:00:13:77.03516: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 2800
33000:00:13:77.03534: IP: 7E03, FLAGS: F206
33100:00:13:77.03543: FLAGSINFO:c1P0a0zstIdo1111 
33200:00:13:77.03553: Interrupt status: 0000000000000010
33300:00:13:77.03558: VGA@42,129(CRT:69,163)
33400:00:13:77.03562: Display=801,471
335
33600:00:13:77.03662: Function 02 called.
33700:00:13:77.03781: Read 1/1 sectors from drive 00, start 53. Requested: Head: 0, Track: 1, Sector: 18. Start sector: 53, Destination: ES:BX=0070:00002800
33800:00:13:77.04843: 0000:7E03 (CD13)INT 13
33900:00:13:77.04846: Registers:
34000:00:13:77.04854: AX: 0201, BX: 2A00, CX: 0101, DX: 0100
34100:00:13:77.04862: CS: 0000, DS: 0000, ES: 0070, SS: 0000
34200:00:13:77.04870: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 2A00
34300:00:13:77.04874: IP: 7E03, FLAGS: F202
34400:00:13:77.04883: FLAGSINFO:c1p0a0zstIdo1111 
34500:00:13:77.04892: Interrupt status: 0000000000000010
34600:00:13:77.04898: VGA@394,136(CRT:421,170)
34700:00:13:77.04901: Display=801,471
348
34900:00:13:77.04981: Function 02 called.
35000:00:13:77.05122: Read 1/1 sectors from drive 00, start 54. Requested: Head: 1, Track: 1, Sector: 1. Start sector: 54, Destination: ES:BX=0070:00002A00
35100:00:13:77.06287: 0000:7E03 (CD13)INT 13
35200:00:13:77.06291: Registers:
35300:00:13:77.06308: AX: 0201, BX: 2C00, CX: 0102, DX: 0100
35400:00:13:77.06334: CS: 0000, DS: 0000, ES: 0070, SS: 0000
35500:00:13:77.06353: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 2C00
35600:00:13:77.06358: IP: 7E03, FLAGS: F202
35700:00:13:77.06367: FLAGSINFO:c1p0a0zstIdo1111 
35800:00:13:77.06376: Interrupt status: 0000000000000010
35900:00:13:77.06382: VGA@731,143(CRT:758,177)
36000:00:13:77.06386: Display=801,471
361
36200:00:13:77.06506: Function 02 called.
36300:00:13:77.06667: Read 1/1 sectors from drive 00, start 55. Requested: Head: 1, Track: 1, Sector: 2. Start sector: 55, Destination: ES:BX=0070:00002C00
36400:00:13:77.07790: 0000:7E03 (CD13)INT 13
36500:00:13:77.07793: Registers:
36600:00:13:77.07801: AX: 0201, BX: 2E00, CX: 0103, DX: 0100
36700:00:13:77.07809: CS: 0000, DS: 0000, ES: 0070, SS: 0000
36800:00:13:77.07816: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 2E00
36900:00:13:77.07821: IP: 7E03, FLAGS: F206
37000:00:13:77.07829: FLAGSINFO:c1P0a0zstIdo1111 
37100:00:13:77.07839: Interrupt status: 0000000000000010
37200:00:13:77.07844: VGA@181,151(CRT:208,185)
37300:00:13:77.07848: Display=801,471
374
37500:00:13:77.07935: Function 02 called.
37600:00:13:77.08068: Read 1/1 sectors from drive 00, start 56. Requested: Head: 1, Track: 1, Sector: 3. Start sector: 56, Destination: ES:BX=0070:00002E00
37700:00:13:77.09218: 0000:7E03 (CD13)INT 13
37800:00:13:77.09222: Registers:
37900:00:13:77.09230: AX: 0201, BX: 3000, CX: 0104, DX: 0100
38000:00:13:77.09237: CS: 0000, DS: 0000, ES: 0070, SS: 0000
38100:00:13:77.09245: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 3000
38200:00:13:77.09250: IP: 7E03, FLAGS: F202
38300:00:13:77.09258: FLAGSINFO:c1p0a0zstIdo1111 
38400:00:13:77.09268: Interrupt status: 0000000000000010
38500:00:13:77.09273: VGA@509,158(CRT:536,192)
38600:00:13:77.09277: Display=801,471
387
38800:00:13:77.09357: Function 02 called.
38900:00:13:77.09476: Read 1/1 sectors from drive 00, start 57. Requested: Head: 1, Track: 1, Sector: 4. Start sector: 57, Destination: ES:BX=0070:00003000
39000:00:13:78.00556: 0000:7E03 (CD13)INT 13
39100:00:13:78.00559: Registers:
39200:00:13:78.00567: AX: 0201, BX: 3200, CX: 0105, DX: 0100
39300:00:13:78.00574: CS: 0000, DS: 0000, ES: 0070, SS: 0000
39400:00:13:78.00582: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 3200
39500:00:13:78.00587: IP: 7E03, FLAGS: F206
39600:00:13:78.00595: FLAGSINFO:c1P0a0zstIdo1111 
39700:00:13:78.00605: Interrupt status: 0000000000000010
39800:00:13:78.00610: VGA@861,166(CRT:0,200)
39900:00:13:78.00614: Display=801,471
400
40100:00:13:78.00744: Function 02 called.
40200:00:13:78.00859: Read 1/1 sectors from drive 00, start 58. Requested: Head: 1, Track: 1, Sector: 5. Start sector: 58, Destination: ES:BX=0070:00003200
40300:00:13:78.02117: 0000:7E03 (CD13)INT 13
40400:00:13:78.02120: Registers:
40500:00:13:78.02128: AX: 0201, BX: 3400, CX: 0106, DX: 0100
40600:00:13:78.02136: CS: 0000, DS: 0000, ES: 0070, SS: 0000
40700:00:13:78.02143: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 3400
40800:00:13:78.02148: IP: 7E03, FLAGS: F206
40900:00:13:78.02156: FLAGSINFO:c1P0a0zstIdo1111 
41000:00:13:78.02166: Interrupt status: 0000000000000010
41100:00:13:78.02171: VGA@298,173(CRT:325,207)
41200:00:13:78.02175: Display=801,471
413
41400:00:13:78.02259: Function 02 called.
41500:00:13:78.02375: Read 1/1 sectors from drive 00, start 59. Requested: Head: 1, Track: 1, Sector: 6. Start sector: 59, Destination: ES:BX=0070:00003400
41600:00:13:78.03455: 0000:7E03 (CD13)INT 13
41700:00:13:78.03458: Registers:
41800:00:13:78.03466: AX: 0201, BX: 3600, CX: 0107, DX: 0100
41900:00:13:78.03474: CS: 0000, DS: 0000, ES: 0070, SS: 0000
42000:00:13:78.03482: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 3600
42100:00:13:78.03486: IP: 7E03, FLAGS: F202
42200:00:13:78.03495: FLAGSINFO:c1p0a0zstIdo1111 
42300:00:13:78.03504: Interrupt status: 0000000000000010
42400:00:13:78.03510: VGA@653,180(CRT:680,214)
42500:00:13:78.03513: Display=801,471
426
42700:00:13:78.03599: Function 02 called.
42800:00:13:78.03713: Read 1/1 sectors from drive 00, start 60. Requested: Head: 1, Track: 1, Sector: 7. Start sector: 60, Destination: ES:BX=0070:00003600
42900:00:13:78.04788: 0000:7E03 (CD13)INT 13
43000:00:13:78.04792: Registers:
43100:00:13:78.04800: AX: 0201, BX: 3800, CX: 0108, DX: 0100
43200:00:13:78.04807: CS: 0000, DS: 0000, ES: 0070, SS: 0000
43300:00:13:78.04815: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 3800
43400:00:13:78.04819: IP: 7E03, FLAGS: F202
43500:00:13:78.04828: FLAGSINFO:c1p0a0zstIdo1111 
43600:00:13:78.04837: Interrupt status: 0000000000000010
43700:00:13:78.04843: VGA@91,188(CRT:118,222)
43800:00:13:78.04846: Display=801,471
439
44000:00:13:78.04928: Function 02 called.
44100:00:13:78.05048: Read 1/1 sectors from drive 00, start 61. Requested: Head: 1, Track: 1, Sector: 8. Start sector: 61, Destination: ES:BX=0070:00003800
44200:00:13:78.06142: 0000:7E03 (CD13)INT 13
44300:00:13:78.06146: Registers:
44400:00:13:78.06154: AX: 0201, BX: 3A00, CX: 0109, DX: 0100
44500:00:13:78.06161: CS: 0000, DS: 0000, ES: 0070, SS: 0000
44600:00:13:78.06169: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 3A00
44700:00:13:78.06174: IP: 7E03, FLAGS: F206
44800:00:13:78.06182: FLAGSINFO:c1P0a0zstIdo1111 
44900:00:13:78.06192: Interrupt status: 0000000000000010
45000:00:13:78.06197: VGA@452,195(CRT:479,229)
45100:00:13:78.06201: Display=801,471
452
45300:00:13:78.06280: Function 02 called.
45400:00:13:78.06393: Read 1/1 sectors from drive 00, start 62. Requested: Head: 1, Track: 1, Sector: 9. Start sector: 62, Destination: ES:BX=0070:00003A00
45500:00:13:78.07539: 0000:7E03 (CD13)INT 13
45600:00:13:78.07554: Registers:
45700:00:13:78.07562: AX: 0201, BX: 3C00, CX: 010A, DX: 0100
45800:00:13:78.07569: CS: 0000, DS: 0000, ES: 0070, SS: 0000
45900:00:13:78.07586: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 3C00
46000:00:13:78.07591: IP: 7E03, FLAGS: F206
46100:00:13:78.07599: FLAGSINFO:c1P0a0zstIdo1111 
46200:00:13:78.07609: Interrupt status: 0000000000000010
46300:00:13:78.07614: VGA@798,203(CRT:0,237)
46400:00:13:78.07618: Display=801,471
465
46600:00:13:78.07705: Function 02 called.
46700:00:13:78.07819: Read 1/1 sectors from drive 00, start 63. Requested: Head: 1, Track: 1, Sector: 10. Start sector: 63, Destination: ES:BX=0070:00003C00
46800:00:13:78.08931: 0000:7E03 (CD13)INT 13
46900:00:13:78.08935: Registers:
47000:00:13:78.08943: AX: 0201, BX: 3E00, CX: 010B, DX: 0100
47100:00:13:78.08950: CS: 0000, DS: 0000, ES: 0070, SS: 0000
47200:00:13:78.08958: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 3E00
47300:00:13:78.08963: IP: 7E03, FLAGS: F202
47400:00:13:78.08971: FLAGSINFO:c1p0a0zstIdo1111 
47500:00:13:78.08981: Interrupt status: 0000000000000010
47600:00:13:78.08986: VGA@241,210(CRT:268,244)
47700:00:13:78.08990: Display=801,471
478
47900:00:13:78.09103: Function 02 called.
48000:00:13:78.09218: Read 1/1 sectors from drive 00, start 64. Requested: Head: 1, Track: 1, Sector: 11. Start sector: 64, Destination: ES:BX=0070:00003E00
48100:00:13:79.00337: 0000:7E03 (CD13)INT 13
48200:00:13:79.00341: Registers:
48300:00:13:79.00349: AX: 0201, BX: 4000, CX: 010C, DX: 0100
48400:00:13:79.00356: CS: 0000, DS: 0000, ES: 0070, SS: 0000
48500:00:13:79.00364: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 4000
48600:00:13:79.00369: IP: 7E03, FLAGS: F206
48700:00:13:79.00377: FLAGSINFO:c1P0a0zstIdo1111 
48800:00:13:79.00386: Interrupt status: 0000000000000010
48900:00:13:79.00392: VGA@557,217(CRT:584,251)
49000:00:13:79.00396: Display=801,471
491
49200:00:13:79.00500: Function 02 called.
49300:00:13:79.00712: Read 1/1 sectors from drive 00, start 65. Requested: Head: 1, Track: 1, Sector: 12. Start sector: 65, Destination: ES:BX=0070:00004000
49400:00:13:80.00642: 0000:7E03 (CD13)INT 13
49500:00:13:80.00646: Registers:
49600:00:13:80.00654: AX: 0201, BX: 4200, CX: 010D, DX: 0100
49700:00:13:80.00662: CS: 0000, DS: 0000, ES: 0070, SS: 0000
49800:00:13:80.00669: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 4200
49900:00:13:80.00674: IP: 7E03, FLAGS: F202
50000:00:13:80.00683: FLAGSINFO:c1p0a0zstIdo1111 
50100:00:13:80.00692: Interrupt status: 0000000000000010
50200:00:13:80.00697: VGA@898,225(CRT:25,259)
50300:00:13:80.00701: Display=801,471
504
50500:00:13:80.00785: Function 02 called.
50600:00:13:80.00927: Read 1/1 sectors from drive 00, start 66. Requested: Head: 1, Track: 1, Sector: 13. Start sector: 66, Destination: ES:BX=0070:00004200
50700:00:13:80.02112: 0000:7E03 (CD13)INT 13
50800:00:13:80.02125: Registers:
50900:00:13:80.02133: AX: 0201, BX: 4400, CX: 010E, DX: 0100
51000:00:13:80.02151: CS: 0000, DS: 0000, ES: 0070, SS: 0000
51100:00:13:80.02168: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 4400
51200:00:13:80.02173: IP: 7E03, FLAGS: F202
51300:00:13:80.02181: FLAGSINFO:c1p0a0zstIdo1111 
51400:00:13:80.02191: Interrupt status: 0000000000000010
51500:00:13:80.02197: VGA@323,232(CRT:350,266)
51600:00:13:80.02201: Display=801,471
517
51800:00:13:80.02304: Function 02 called.
51900:00:13:80.02462: Read 1/1 sectors from drive 00, start 67. Requested: Head: 1, Track: 1, Sector: 14. Start sector: 67, Destination: ES:BX=0070:00004400
52000:00:13:80.03587: 0000:7E03 (CD13)INT 13
52100:00:13:80.03590: Registers:
52200:00:13:80.03598: AX: 0201, BX: 4600, CX: 010F, DX: 0100
52300:00:13:80.03606: CS: 0000, DS: 0000, ES: 0070, SS: 0000
52400:00:13:80.03614: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 4600
52500:00:13:80.03619: IP: 7E03, FLAGS: F206
52600:00:13:80.03627: FLAGSINFO:c1P0a0zstIdo1111 
52700:00:13:80.03637: Interrupt status: 0000000000000010
52800:00:13:80.03643: VGA@666,239(CRT:693,273)
52900:00:13:80.03647: Display=801,471
530
53100:00:13:80.03728: Function 02 called.
53200:00:13:80.03845: Read 1/1 sectors from drive 00, start 68. Requested: Head: 1, Track: 1, Sector: 15. Start sector: 68, Destination: ES:BX=0070:00004600
53300:00:13:80.04885: 0000:7E03 (CD13)INT 13
53400:00:13:80.04888: Registers:
53500:00:13:80.04896: AX: 0201, BX: 4800, CX: 0110, DX: 0100
53600:00:13:80.04904: CS: 0000, DS: 0000, ES: 0070, SS: 0000
53700:00:13:80.04912: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 4800
53800:00:13:80.04917: IP: 7E03, FLAGS: F202
53900:00:13:80.04925: FLAGSINFO:c1p0a0zstIdo1111 
54000:00:13:80.04935: Interrupt status: 0000000000000010
54100:00:13:80.04941: VGA@92,247(CRT:119,281)
54200:00:13:80.04944: Display=801,471
543
54400:00:13:80.05031: Function 02 called.
54500:00:13:80.05147: Read 1/1 sectors from drive 00, start 69. Requested: Head: 1, Track: 1, Sector: 16. Start sector: 69, Destination: ES:BX=0070:00004800
54600:00:13:80.06192: 0000:7E03 (CD13)INT 13
54700:00:13:80.06195: Registers:
54800:00:13:80.06203: AX: 0201, BX: 4A00, CX: 0111, DX: 0100
54900:00:13:80.06211: CS: 0000, DS: 0000, ES: 0070, SS: 0000
55000:00:13:80.06219: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 4A00
55100:00:13:80.06224: IP: 7E03, FLAGS: F206
55200:00:13:80.06232: FLAGSINFO:c1P0a0zstIdo1111 
55300:00:13:80.06242: Interrupt status: 0000000000000010
55400:00:13:80.06247: VGA@441,254(CRT:468,288)
55500:00:13:80.06252: Display=801,471
556
55700:00:13:80.06340: Function 02 called.
55800:00:13:80.06463: Read 1/1 sectors from drive 00, start 70. Requested: Head: 1, Track: 1, Sector: 17. Start sector: 70, Destination: ES:BX=0070:00004A00
55900:00:13:80.07589: 0000:7E03 (CD13)INT 13
56000:00:13:80.07594: Registers:
56100:00:13:80.07602: AX: 0201, BX: 4C00, CX: 0112, DX: 0100
56200:00:13:80.07610: CS: 0000, DS: 0000, ES: 0070, SS: 0000
56300:00:13:80.07618: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 4C00
56400:00:13:80.07622: IP: 7E03, FLAGS: F206
56500:00:13:80.07631: FLAGSINFO:c1P0a0zstIdo1111 
56600:00:13:80.07641: Interrupt status: 0000000000000010
56700:00:13:80.07646: VGA@766,261(CRT:793,295)
56800:00:13:80.07650: Display=801,471
569
57000:00:13:80.07733: Function 02 called.
57100:00:13:80.07871: Read 1/1 sectors from drive 00, start 71. Requested: Head: 1, Track: 1, Sector: 18. Start sector: 71, Destination: ES:BX=0070:00004C00
57200:00:13:80.08938: 0000:7E03 (CD13)INT 13
57300:00:13:80.08941: Registers:
57400:00:13:80.08949: AX: 0201, BX: 4E00, CX: 0201, DX: 0000
57500:00:13:80.08956: CS: 0000, DS: 0000, ES: 0070, SS: 0000
57600:00:13:80.08964: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 4E00
57700:00:13:80.08969: IP: 7E03, FLAGS: F202
57800:00:13:80.08977: FLAGSINFO:c1p0a0zstIdo1111 
57900:00:13:80.08987: Interrupt status: 0000000000000010
58000:00:13:80.08992: VGA@212,269(CRT:239,303)
58100:00:13:80.08996: Display=801,471
582
58300:00:13:80.09079: Function 02 called.
58400:00:13:80.09191: Read 1/1 sectors from drive 00, start 72. Requested: Head: 0, Track: 2, Sector: 1. Start sector: 72, Destination: ES:BX=0070:00004E00
58500:00:13:81.00230: 0000:7E03 (CD13)INT 13
58600:00:13:81.00233: Registers:
58700:00:13:81.00241: AX: 0201, BX: 5000, CX: 0202, DX: 0000
58800:00:13:81.00249: CS: 0000, DS: 0000, ES: 0070, SS: 0000
58900:00:13:81.00256: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 5000
59000:00:13:81.00261: IP: 7E03, FLAGS: F202
59100:00:13:81.00270: FLAGSINFO:c1p0a0zstIdo1111 
59200:00:13:81.00279: Interrupt status: 0000000000000010
59300:00:13:81.00284: VGA@538,276(CRT:565,310)
59400:00:13:81.00288: Display=801,471
595
59600:00:13:81.00393: Function 02 called.
59700:00:13:81.00508: Read 1/1 sectors from drive 00, start 73. Requested: Head: 0, Track: 2, Sector: 2. Start sector: 73, Destination: ES:BX=0070:00005000
59800:00:13:81.01571: 0000:7E03 (CD13)INT 13
59900:00:13:81.01575: Registers:
60000:00:13:81.01583: AX: 0201, BX: 5200, CX: 0203, DX: 0000
60100:00:13:81.01590: CS: 0000, DS: 0000, ES: 0070, SS: 0000
60200:00:13:81.01598: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 5200
60300:00:13:81.01603: IP: 7E03, FLAGS: F206
60400:00:13:81.01611: FLAGSINFO:c1P0a0zstIdo1111 
60500:00:13:81.01621: Interrupt status: 0000000000000010
60600:00:13:81.01626: VGA@887,284(CRT:14,318)
60700:00:13:81.01630: Display=801,471
608
60900:00:13:81.01712: Function 02 called.
61000:00:13:81.01824: Read 1/1 sectors from drive 00, start 74. Requested: Head: 0, Track: 2, Sector: 3. Start sector: 74, Destination: ES:BX=0070:00005200
61100:00:13:81.02866: 0000:7E03 (CD13)INT 13
61200:00:13:81.02869: Registers:
61300:00:13:81.02877: AX: 0201, BX: 5400, CX: 0204, DX: 0000
61400:00:13:81.02885: CS: 0000, DS: 0000, ES: 0070, SS: 0000
61500:00:13:81.02893: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 5400
61600:00:13:81.02898: IP: 7E03, FLAGS: F202
61700:00:13:81.02906: FLAGSINFO:c1p0a0zstIdo1111 
61800:00:13:81.02916: Interrupt status: 0000000000000010
61900:00:13:81.02921: VGA@321,291(CRT:348,325)
62000:00:13:81.02925: Display=801,471
621
62200:00:13:81.03005: Function 02 called.
62300:00:13:81.03116: Read 1/1 sectors from drive 00, start 75. Requested: Head: 0, Track: 2, Sector: 4. Start sector: 75, Destination: ES:BX=0070:00005400
62400:00:13:81.04176: 0000:7E03 (CD13)INT 13
62500:00:13:81.04179: Registers:
62600:00:13:81.04187: AX: 0201, BX: 5600, CX: 0205, DX: 0000
62700:00:13:81.04195: CS: 0000, DS: 0000, ES: 0070, SS: 0000
62800:00:13:81.04202: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 5600
62900:00:13:81.04207: IP: 7E03, FLAGS: F206
63000:00:13:81.04215: FLAGSINFO:c1P0a0zstIdo1111 
63100:00:13:81.04225: Interrupt status: 0000000000000010
63200:00:13:81.04230: VGA@673,298(CRT:700,332)
63300:00:13:81.04234: Display=801,471
634
63500:00:13:81.04313: Function 02 called.
63600:00:13:81.04426: Read 1/1 sectors from drive 00, start 76. Requested: Head: 0, Track: 2, Sector: 5. Start sector: 76, Destination: ES:BX=0070:00005600
63700:00:13:81.05498: 0000:7E03 (CD13)INT 13
63800:00:13:81.05501: Registers:
63900:00:13:81.05509: AX: 0201, BX: 5800, CX: 0206, DX: 0000
64000:00:13:81.05517: CS: 0000, DS: 0000, ES: 0070, SS: 0000
64100:00:13:81.05524: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 5800
64200:00:13:81.05529: IP: 7E03, FLAGS: F206
64300:00:13:81.05537: FLAGSINFO:c1P0a0zstIdo1111 
64400:00:13:81.05547: Interrupt status: 0000000000000010
64500:00:13:81.05552: VGA@107,306(CRT:134,340)
64600:00:13:81.05556: Display=801,471
647
64800:00:13:81.05642: Function 02 called.
64900:00:13:81.05753: Read 1/1 sectors from drive 00, start 77. Requested: Head: 0, Track: 2, Sector: 6. Start sector: 77, Destination: ES:BX=0070:00005800
65000:00:13:81.06837: 0000:7E03 (CD13)INT 13
65100:00:13:81.06841: Registers:
65200:00:13:81.06849: AX: 0201, BX: 5A00, CX: 0207, DX: 0000
65300:00:13:81.06867: CS: 0000, DS: 0000, ES: 0070, SS: 0000
65400:00:13:81.06875: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 5A00
65500:00:13:81.06879: IP: 7E03, FLAGS: F202
65600:00:13:81.06888: FLAGSINFO:c1p0a0zstIdo1111 
65700:00:13:81.06897: Interrupt status: 0000000000000010
65800:00:13:81.06902: VGA@465,313(CRT:492,347)
65900:00:13:81.06906: Display=801,471
660
66100:00:13:81.06988: Function 02 called.
66200:00:13:81.07102: Read 1/1 sectors from drive 00, start 78. Requested: Head: 0, Track: 2, Sector: 7. Start sector: 78, Destination: ES:BX=0070:00005A00
66300:00:13:81.08176: 0000:7E03 (CD13)INT 13
66400:00:13:81.08179: Registers:
66500:00:13:81.08187: AX: 0201, BX: 5C00, CX: 0208, DX: 0000
66600:00:13:81.08195: CS: 0000, DS: 0000, ES: 0070, SS: 0000
66700:00:13:81.08202: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 5C00
66800:00:13:81.08207: IP: 7E03, FLAGS: F202
66900:00:13:81.08216: FLAGSINFO:c1p0a0zstIdo1111 
67000:00:13:81.08225: Interrupt status: 0000000000000010
67100:00:13:81.08230: VGA@809,321(CRT:0,355)
67200:00:13:81.08234: Display=801,471
673
67400:00:13:81.08317: Function 02 called.
67500:00:13:81.08445: Read 1/1 sectors from drive 00, start 79. Requested: Head: 0, Track: 2, Sector: 8. Start sector: 79, Destination: ES:BX=0070:00005C00
67600:00:13:81.09512: 0000:7E03 (CD13)INT 13
67700:00:13:81.09515: Registers:
67800:00:13:81.09523: AX: 0201, BX: 5E00, CX: 0209, DX: 0000
67900:00:13:81.09531: CS: 0000, DS: 0000, ES: 0070, SS: 0000
68000:00:13:81.09539: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 5E00
68100:00:13:81.09543: IP: 7E03, FLAGS: F206
68200:00:13:81.09552: FLAGSINFO:c1P0a0zstIdo1111 
68300:00:13:81.09561: Interrupt status: 0000000000000010
68400:00:13:81.09566: VGA@258,328(CRT:285,362)
68500:00:13:81.09570: Display=801,471
686
68700:00:13:81.09651: Function 02 called.
68800:00:13:81.09763: Read 1/1 sectors from drive 00, start 80. Requested: Head: 0, Track: 2, Sector: 9. Start sector: 80, Destination: ES:BX=0070:00005E00
68900:00:13:82.00783: 0000:7E03 (CD13)INT 13
69000:00:13:82.00786: Registers:
69100:00:13:82.00794: AX: 0201, BX: 6000, CX: 020A, DX: 0000
69200:00:13:82.00802: CS: 0000, DS: 0000, ES: 0070, SS: 0000
69300:00:13:82.00810: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 6000
69400:00:13:82.00815: IP: 7E03, FLAGS: F206
69500:00:13:82.00823: FLAGSINFO:c1P0a0zstIdo1111 
69600:00:13:82.00834: Interrupt status: 0000000000000010
69700:00:13:82.00849: VGA@583,335(CRT:610,369)
69800:00:13:82.00853: Display=801,471
699
70000:00:13:82.00946: Function 02 called.
70100:00:13:82.01059: Read 1/1 sectors from drive 00, start 81. Requested: Head: 0, Track: 2, Sector: 10. Start sector: 81, Destination: ES:BX=0070:00006000
70200:00:13:82.02079: 0000:7E03 (CD13)INT 13
70300:00:13:82.02082: Registers:
70400:00:13:82.02090: AX: 0201, BX: 6200, CX: 020B, DX: 0000
70500:00:13:82.02098: CS: 0000, DS: 0000, ES: 0070, SS: 0000
70600:00:13:82.02106: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 6200
70700:00:13:82.02111: IP: 7E03, FLAGS: F202
70800:00:13:82.02119: FLAGSINFO:c1p0a0zstIdo1111 
70900:00:13:82.02128: Interrupt status: 0000000000000010
71000:00:13:82.02133: VGA@32,343(CRT:59,377)
71100:00:13:82.02137: Display=801,471
712
71300:00:13:82.02219: Function 02 called.
71400:00:13:82.02331: Read 1/1 sectors from drive 00, start 82. Requested: Head: 0, Track: 2, Sector: 11. Start sector: 82, Destination: ES:BX=0070:00006200
71500:00:13:82.03391: 0000:7E03 (CD13)INT 13
71600:00:13:82.03431: Registers:
71700:00:13:82.03439: AX: 0201, BX: 6400, CX: 020C, DX: 0000
71800:00:13:82.03446: CS: 0000, DS: 0000, ES: 0070, SS: 0000
71900:00:13:82.03454: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 6400
72000:00:13:82.03459: IP: 7E03, FLAGS: F206
72100:00:13:82.03467: FLAGSINFO:c1P0a0zstIdo1111 
72200:00:13:82.03476: Interrupt status: 0000000000000010
72300:00:13:82.03481: VGA@366,350(CRT:393,384)
72400:00:13:82.03485: Display=801,471
725
72600:00:13:82.03570: Function 02 called.
72700:00:13:82.03683: Read 1/1 sectors from drive 00, start 83. Requested: Head: 0, Track: 2, Sector: 12. Start sector: 83, Destination: ES:BX=0070:00006400
72800:00:14:33.02244: 0070:3506 (CD11)INT 11
72900:00:14:33.02248: Registers:
73000:00:14:33.02255: AX: F000, BX: 0021, CX: F000, DX: 0000
73100:00:14:33.02263: CS: 0070, DS: 0000, ES: 0070, SS: 0000
73200:00:14:33.02270: SP: 7BE0, BP: 7BE2, SI: 74E2, DI: 72D4
73300:00:14:33.02275: IP: 3506, FLAGS: F256
73400:00:14:33.02283: FLAGSINFO:c1P0A0ZstIdo1111 
73500:00:14:33.02293: Interrupt status: 0000000000000010
73600:00:14:33.02298: VGA@188,260(CRT:215,294)
73700:00:14:33.02302: Display=801,446
738
73900:00:14:33.02640: 0070:353E (CD15)INT 15
74000:00:14:33.02643: Registers:
74100:00:14:33.02650: AX: C000, BX: 0021, CX: F002, DX: 0000
74200:00:14:33.02658: CS: 0070, DS: 0000, ES: 0070, SS: 0000
74300:00:14:33.02665: SP: 06FC, BP: 7BE2, SI: 74E2, DI: 72D4
74400:00:14:33.02670: IP: 353E, FLAGS: F246
74500:00:14:33.02678: FLAGSINFO:c1P0a0ZstIdo1111 
74600:00:14:33.02687: Interrupt status: 0000000000000010
74700:00:14:33.02692: VGA@796,262(CRT:0,296)
74800:00:14:33.02696: Display=801,446
749

So the int 15h interrupt handler has an error?

Author of the UniPCemu emulator.
UniPCemu Git repository
UniPCemu for Android, Windows, PSP, Vita and Switch on itch.io

Reply 11 of 14, by superfury

Posted on 2016-07-14, 09:08

superfury Offline

Rank l33t++

Rank: l33t++
Posts: 5848
Joined: 2014-03-08, 11:25
Location: Netherlands

I've managed to fix the interrupt 15 handler: It was changing and returning from the callback, which is wrapped in a zero-callback(INT 15h->CALL start->CALLBACK;RETF;IRET). I've modified the default callback structure to handle the callback normally, but instead of the final IRET, it will now execute an RETF 2 instruction. This seems to make the code continue properly(so it still executed the IRET after returning from the zero callback).

This is the new log:

100:00:13:76.05228: 0000:7C6E (CD13)INT 13
200:00:13:76.05448: Registers:
300:00:13:76.05456: AX: 0000, BX: 0078, CX: 0000, DX: 0000
400:00:13:76.05464: CS: 0000, DS: 0000, ES: 0000, SS: 0000
500:00:13:76.05472: SP: 7BF8, BP: 0000, SI: 014B, DI: 7C36
600:00:13:76.05477: IP: 7C6E, FLAGS: F246
700:00:13:76.05485: FLAGSINFO:c1P0a0ZstIdo1111 
800:00:13:76.05494: Interrupt status: 0000000000000010
900:00:13:76.05499: VGA@379,351(CRT:406,410)
1000:00:13:76.05503: Display=712,446
11
1200:00:13:76.05612: Function 00 called.
1300:00:13:77.04461: 0000:7D74 (CD13)INT 13
1400:00:13:77.04465: Registers:
1500:00:13:77.04473: AX: 0201, BX: 0500, CX: 0002, DX: 0100
1600:00:13:77.04480: CS: 0000, DS: 0000, ES: 0000, SS: 0000
1700:00:13:77.04488: SP: 7BF4, BP: 0000, SI: 014B, DI: 7C36
1800:00:13:77.04493: IP: 7D74, FLAGS: F202
1900:00:13:77.04501: FLAGSINFO:c1p0a0zstIdo1111 
2000:00:13:77.04510: Interrupt status: 0000000000000010
2100:00:13:77.04515: VGA@715,356(CRT:742,415)
2200:00:13:77.04519: Display=712,446
23
2400:00:13:77.04619: Function 02 called.
2500:00:13:77.04776: Read 1/1 sectors from drive 00, start 19. Requested: Head: 1, Track: 0, Sector: 2. Start sector: 19, Destination: ES:BX=0000:00000500
2600:00:13:77.05478: 0000:7D74 (CD13)INT 13
2700:00:13:77.05482: Registers:
2800:00:13:77.05489: AX: 0201, BX: 0700, CX: 0010, DX: 0100
2900:00:13:77.05497: CS: 0000, DS: 0000, ES: 0000, SS: 0000
3000:00:13:77.05504: SP: 7BF4, BP: 0000, SI: 7DF6, DI: 052B
3100:00:13:77.05509: IP: 7D74, FLAGS: F202
3200:00:13:77.05517: FLAGSINFO:c1p0a0zstIdo1111 
3300:00:13:77.05526: Interrupt status: 0000000000000010
3400:00:13:77.05532: VGA@358,362(CRT:385,421)
3500:00:13:77.05535: Display=712,446
36
3700:00:13:77.05677: Function 02 called.
3800:00:13:77.05824: Read 1/1 sectors from drive 00, start 33. Requested: Head: 1, Track: 0, Sector: 16. Start sector: 33, Destination: ES:BX=0000:00000700
3900:00:13:77.06298: 0000:7D74 (CD13)INT 13
4000:00:13:77.06302: Registers:
4100:00:13:77.06309: AX: 0201, BX: 0900, CX: 0011, DX: 0100
4200:00:13:77.06317: CS: 0000, DS: 0000, ES: 0000, SS: 0000
4300:00:13:77.06324: SP: 7BF4, BP: 0000, SI: 7DF6, DI: 052B
4400:00:13:77.06329: IP: 7D74, FLAGS: F206
4500:00:13:77.06337: FLAGSINFO:c1P0a0zstIdo1111 
4600:00:13:77.06346: Interrupt status: 0000000000000010
4700:00:13:77.06351: VGA@846,365(CRT:0,424)
4800:00:13:77.06355: Display=712,446
49
5000:00:13:77.06438: Function 02 called.
5100:00:13:77.06549: Read 1/1 sectors from drive 00, start 34. Requested: Head: 1, Track: 0, Sector: 17. Start sector: 34, Destination: ES:BX=0000:00000900
5200:00:13:78.06002: 0000:7E03 (CD13)INT 13
5300:00:13:78.06006: Registers:
5400:00:13:78.06014: AX: 0209, BX: 0000, CX: 0002, DX: 0000
5500:00:13:78.06022: CS: 0000, DS: 0000, ES: 0800, SS: 0000
5600:00:13:78.06029: SP: 7BDA, BP: 7BE2, SI: 0009, DI: 0000
5700:00:13:78.06034: IP: 7E03, FLAGS: F202
5800:00:13:78.06042: FLAGSINFO:c1p0a0zstIdo1111 
5900:00:13:78.06051: Interrupt status: 0000000000000010
6000:00:13:78.06056: VGA@739,414(CRT:766,0)

…Show last 701 lines

6100:00:13:78.06060: Display=801,471
62
6300:00:13:78.06160: Function 02 called.
6400:00:13:78.06802: Read 9/9 sectors from drive 00, start 1. Requested: Head: 0, Track: 0, Sector: 2. Start sector: 1, Destination: ES:BX=0800:00000000
6500:00:13:78.07493: 0000:7E03 (CD13)INT 13
6600:00:13:78.07496: Registers:
6700:00:13:78.07504: AX: 0201, BX: 0000, CX: 0010, DX: 0100
6800:00:13:78.07511: CS: 0000, DS: 0000, ES: 0070, SS: 0000
6900:00:13:78.07519: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 0000
7000:00:13:78.07523: IP: 7E03, FLAGS: F202
7100:00:13:78.07532: FLAGSINFO:c1p0a0zstIdo1111 
7200:00:13:78.07541: Interrupt status: 0000000000000010
7300:00:13:78.07546: VGA@357,420(CRT:384,6)
7400:00:13:78.07549: Display=801,471
75
7600:00:13:78.07620: Function 02 called.
7700:00:13:78.07732: Read 1/1 sectors from drive 00, start 33. Requested: Head: 1, Track: 0, Sector: 16. Start sector: 33, Destination: ES:BX=0070:00000000
7800:00:13:78.08697: 0000:7E03 (CD13)INT 13
7900:00:13:78.08700: Registers:
8000:00:13:78.08708: AX: 0201, BX: 0200, CX: 0011, DX: 0100
8100:00:13:78.08716: CS: 0000, DS: 0000, ES: 0070, SS: 0000
8200:00:13:78.08724: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 0200
8300:00:13:78.08793: IP: 7E03, FLAGS: F206
8400:00:13:78.08801: FLAGSINFO:c1P0a0zstIdo1111 
8500:00:13:78.08810: Interrupt status: 0000000000000010
8600:00:13:78.08816: VGA@692,427(CRT:719,13)
8700:00:13:78.08819: Display=801,471
88
8900:00:13:78.08900: Function 02 called.
9000:00:13:78.09016: Read 1/1 sectors from drive 00, start 34. Requested: Head: 1, Track: 0, Sector: 17. Start sector: 34, Destination: ES:BX=0070:00000200
9100:00:13:78.09906: 0000:7E03 (CD13)INT 13
9200:00:13:78.09910: Registers:
9300:00:13:78.09918: AX: 0201, BX: 0400, CX: 0012, DX: 0100
9400:00:13:78.09925: CS: 0000, DS: 0000, ES: 0070, SS: 0000
9500:00:13:78.09933: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 0400
9600:00:13:78.09938: IP: 7E03, FLAGS: F206
9700:00:13:78.09946: FLAGSINFO:c1P0a0zstIdo1111 
9800:00:13:78.09956: Interrupt status: 0000000000000010
9900:00:13:78.09961: VGA@102,435(CRT:129,21)
10000:00:13:78.09965: Display=801,471
101
10200:00:13:79.00036: Function 02 called.
10300:00:13:79.00177: Read 1/1 sectors from drive 00, start 35. Requested: Head: 1, Track: 0, Sector: 18. Start sector: 35, Destination: ES:BX=0070:00000400
10400:00:13:79.01150: 0000:7E03 (CD13)INT 13
10500:00:13:79.01154: Registers:
10600:00:13:79.01162: AX: 0201, BX: 0600, CX: 0101, DX: 0000
10700:00:13:79.01169: CS: 0000, DS: 0000, ES: 0070, SS: 0000
10800:00:13:79.01177: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 0600
10900:00:13:79.01182: IP: 7E03, FLAGS: F202
11000:00:13:79.01190: FLAGSINFO:c1p0a0zstIdo1111 
11100:00:13:79.01200: Interrupt status: 0000000000000010
11200:00:13:79.01205: VGA@439,442(CRT:466,28)
11300:00:13:79.01209: Display=801,471
114
11500:00:13:79.01283: Function 02 called.
11600:00:13:79.01396: Read 1/1 sectors from drive 00, start 36. Requested: Head: 0, Track: 1, Sector: 1. Start sector: 36, Destination: ES:BX=0070:00000600
11700:00:13:79.02335: 0000:7E03 (CD13)INT 13
11800:00:13:79.02339: Registers:
11900:00:13:79.02346: AX: 0201, BX: 0800, CX: 0102, DX: 0000
12000:00:13:79.02354: CS: 0000, DS: 0000, ES: 0070, SS: 0000
12100:00:13:79.02362: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 0800
12200:00:13:79.02367: IP: 7E03, FLAGS: F202
12300:00:13:79.02375: FLAGSINFO:c1p0a0zstIdo1111 
12400:00:13:79.02385: Interrupt status: 0000000000000010
12500:00:13:79.02389: VGA@760,1(CRT:787,35)
12600:00:13:79.02393: Display=801,471
127
12800:00:13:79.02474: Function 02 called.
12900:00:13:79.02587: Read 1/1 sectors from drive 00, start 37. Requested: Head: 0, Track: 1, Sector: 2. Start sector: 37, Destination: ES:BX=0070:00000800
13000:00:13:79.03616: 0000:7E03 (CD13)INT 13
13100:00:13:79.03620: Registers:
13200:00:13:79.03628: AX: 0201, BX: 0A00, CX: 0103, DX: 0000
13300:00:13:79.03635: CS: 0000, DS: 0000, ES: 0070, SS: 0000
13400:00:13:79.03643: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 0A00
13500:00:13:79.03648: IP: 7E03, FLAGS: F206
13600:00:13:79.03656: FLAGSINFO:c1P0a0zstIdo1111 
13700:00:13:79.03666: Interrupt status: 0000000000000010
13800:00:13:79.03670: VGA@203,9(CRT:230,43)
13900:00:13:79.03674: Display=801,471
140
14100:00:13:79.03754: Function 02 called.
14200:00:13:79.03867: Read 1/1 sectors from drive 00, start 38. Requested: Head: 0, Track: 1, Sector: 3. Start sector: 38, Destination: ES:BX=0070:00000A00
14300:00:13:79.04847: 0000:7E03 (CD13)INT 13
14400:00:13:79.04850: Registers:
14500:00:13:79.04858: AX: 0201, BX: 0C00, CX: 0104, DX: 0000
14600:00:13:79.04866: CS: 0000, DS: 0000, ES: 0070, SS: 0000
14700:00:13:79.04873: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 0C00
14800:00:13:79.04878: IP: 7E03, FLAGS: F202
14900:00:13:79.04886: FLAGSINFO:c1p0a0zstIdo1111 
15000:00:13:79.04896: Interrupt status: 0000000000000010
15100:00:13:79.04901: VGA@531,16(CRT:558,50)
15200:00:13:79.04905: Display=801,471
153
15400:00:13:79.04980: Function 02 called.
15500:00:13:79.05092: Read 1/1 sectors from drive 00, start 39. Requested: Head: 0, Track: 1, Sector: 4. Start sector: 39, Destination: ES:BX=0070:00000C00
15600:00:13:79.06073: 0000:7E03 (CD13)INT 13
15700:00:13:79.06077: Registers:
15800:00:13:79.06085: AX: 0201, BX: 0E00, CX: 0105, DX: 0000
15900:00:13:79.06092: CS: 0000, DS: 0000, ES: 0070, SS: 0000
16000:00:13:79.06100: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 0E00
16100:00:13:79.06106: IP: 7E03, FLAGS: F206
16200:00:13:79.06135: FLAGSINFO:c1P0a0zstIdo1111 
16300:00:13:79.06144: Interrupt status: 0000000000000010
16400:00:13:79.06149: VGA@872,24(CRT:0,58)
16500:00:13:79.06153: Display=801,471
166
16700:00:13:79.06240: Function 02 called.
16800:00:13:79.06354: Read 1/1 sectors from drive 00, start 40. Requested: Head: 0, Track: 1, Sector: 5. Start sector: 40, Destination: ES:BX=0070:00000E00
16900:00:13:79.07387: 0000:7E03 (CD13)INT 13
17000:00:13:79.07390: Registers:
17100:00:13:79.07398: AX: 0201, BX: 1000, CX: 0106, DX: 0000
17200:00:13:79.07406: CS: 0000, DS: 0000, ES: 0070, SS: 0000
17300:00:13:79.07414: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 1000
17400:00:13:79.07419: IP: 7E03, FLAGS: F206
17500:00:13:79.07427: FLAGSINFO:c1P0a0zstIdo1111 
17600:00:13:79.07436: Interrupt status: 0000000000000010
17700:00:13:79.07441: VGA@291,31(CRT:318,65)
17800:00:13:79.07445: Display=801,471
179
18000:00:13:79.07523: Function 02 called.
18100:00:13:79.07637: Read 1/1 sectors from drive 00, start 41. Requested: Head: 0, Track: 1, Sector: 6. Start sector: 41, Destination: ES:BX=0070:00001000
18200:00:13:79.08619: 0000:7E03 (CD13)INT 13
18300:00:13:79.08622: Registers:
18400:00:13:79.08630: AX: 0201, BX: 1200, CX: 0107, DX: 0000
18500:00:13:79.08638: CS: 0000, DS: 0000, ES: 0070, SS: 0000
18600:00:13:79.08646: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 1200
18700:00:13:79.08650: IP: 7E03, FLAGS: F202
18800:00:13:79.08659: FLAGSINFO:c1p0a0zstIdo1111 
18900:00:13:79.08668: Interrupt status: 0000000000000010
19000:00:13:79.08673: VGA@634,38(CRT:661,72)
19100:00:13:79.08685: Display=801,471
192
19300:00:13:79.08762: Function 02 called.
19400:00:13:79.08871: Read 1/1 sectors from drive 00, start 42. Requested: Head: 0, Track: 1, Sector: 7. Start sector: 42, Destination: ES:BX=0070:00001200
19500:00:13:80.08303: 0000:7E03 (CD13)INT 13
19600:00:13:80.08307: Registers:
19700:00:13:80.08315: AX: 0201, BX: 1400, CX: 0108, DX: 0000
19800:00:13:80.08323: CS: 0000, DS: 0000, ES: 0070, SS: 0000
19900:00:13:80.08330: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 1400
20000:00:13:80.08335: IP: 7E03, FLAGS: F202
20100:00:13:80.08343: FLAGSINFO:c1p0a0zstIdo1111 
20200:00:13:80.08352: Interrupt status: 0000000000000010
20300:00:13:80.08357: VGA@63,46(CRT:90,80)
20400:00:13:80.08361: Display=801,471
205
20600:00:13:80.08448: Function 02 called.
20700:00:13:80.08588: Read 1/1 sectors from drive 00, start 43. Requested: Head: 0, Track: 1, Sector: 8. Start sector: 43, Destination: ES:BX=0070:00001400
20800:00:13:80.09596: 0000:7E03 (CD13)INT 13
20900:00:13:80.09599: Registers:
21000:00:13:80.09607: AX: 0201, BX: 1600, CX: 0109, DX: 0000
21100:00:13:80.09615: CS: 0000, DS: 0000, ES: 0070, SS: 0000
21200:00:13:80.09622: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 1600
21300:00:13:80.09627: IP: 7E03, FLAGS: F206
21400:00:13:80.09635: FLAGSINFO:c1P0a0zstIdo1111 
21500:00:13:80.09644: Interrupt status: 0000000000000010
21600:00:13:80.09649: VGA@409,53(CRT:436,87)
21700:00:13:80.09653: Display=801,471
218
21900:00:13:80.09728: Function 02 called.
22000:00:13:80.09841: Read 1/1 sectors from drive 00, start 44. Requested: Head: 0, Track: 1, Sector: 9. Start sector: 44, Destination: ES:BX=0070:00001600
22100:00:13:81.00881: 0000:7E03 (CD13)INT 13
22200:00:13:81.00884: Registers:
22300:00:13:81.00892: AX: 0201, BX: 1800, CX: 010A, DX: 0000
22400:00:13:81.00900: CS: 0000, DS: 0000, ES: 0070, SS: 0000
22500:00:13:81.00907: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 1800
22600:00:13:81.00912: IP: 7E03, FLAGS: F206
22700:00:13:81.00920: FLAGSINFO:c1P0a0zstIdo1111 
22800:00:13:81.00929: Interrupt status: 0000000000000010
22900:00:13:81.00934: VGA@737,60(CRT:764,94)
23000:00:13:81.00938: Display=801,471
231
23200:00:13:81.01017: Function 02 called.
23300:00:13:81.01131: Read 1/1 sectors from drive 00, start 45. Requested: Head: 0, Track: 1, Sector: 10. Start sector: 45, Destination: ES:BX=0070:00001800
23400:00:13:81.02639: 0000:7E03 (CD13)INT 13
23500:00:13:81.02645: Registers:
23600:00:13:81.02657: AX: 0201, BX: 1A00, CX: 010B, DX: 0000
23700:00:13:81.02679: CS: 0000, DS: 0000, ES: 0070, SS: 0000
23800:00:13:81.02691: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 1A00
23900:00:13:81.02698: IP: 7E03, FLAGS: F202
24000:00:13:81.02712: FLAGSINFO:c1p0a0zstIdo1111 
24100:00:13:81.02739: Interrupt status: 0000000000000010
24200:00:13:81.02785: VGA@189,68(CRT:216,102)
24300:00:13:81.02793: Display=801,471
244
24500:00:13:81.02903: Function 02 called.
24600:00:13:81.03052: Read 1/1 sectors from drive 00, start 46. Requested: Head: 0, Track: 1, Sector: 11. Start sector: 46, Destination: ES:BX=0070:00001A00
24700:00:13:81.04125: 0000:7E03 (CD13)INT 13
24800:00:13:81.04128: Registers:
24900:00:13:81.04136: AX: 0201, BX: 1C00, CX: 010C, DX: 0000
25000:00:13:81.04144: CS: 0000, DS: 0000, ES: 0070, SS: 0000
25100:00:13:81.04151: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 1C00
25200:00:13:81.04156: IP: 7E03, FLAGS: F206
25300:00:13:81.04164: FLAGSINFO:c1P0a0zstIdo1111 
25400:00:13:81.04173: Interrupt status: 0000000000000010
25500:00:13:81.04178: VGA@526,75(CRT:553,109)
25600:00:13:81.04182: Display=801,471
257
25800:00:13:81.04269: Function 02 called.
25900:00:13:81.04391: Read 1/1 sectors from drive 00, start 47. Requested: Head: 0, Track: 1, Sector: 12. Start sector: 47, Destination: ES:BX=0070:00001C00
26000:00:13:81.05439: 0000:7E03 (CD13)INT 13
26100:00:13:81.05443: Registers:
26200:00:13:81.05450: AX: 0201, BX: 1E00, CX: 010D, DX: 0000
26300:00:13:81.05458: CS: 0000, DS: 0000, ES: 0070, SS: 0000
26400:00:13:81.05465: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 1E00
26500:00:13:81.05470: IP: 7E03, FLAGS: F202
26600:00:13:81.05478: FLAGSINFO:c1p0a0zstIdo1111 
26700:00:13:81.05488: Interrupt status: 0000000000000010
26800:00:13:81.05492: VGA@870,83(CRT:0,117)
26900:00:13:81.05496: Display=801,471
270
27100:00:13:81.05574: Function 02 called.
27200:00:13:81.05695: Read 1/1 sectors from drive 00, start 48. Requested: Head: 0, Track: 1, Sector: 13. Start sector: 48, Destination: ES:BX=0070:00001E00
27300:00:13:81.06831: 0000:7E03 (CD13)INT 13
27400:00:13:81.06835: Registers:
27500:00:13:81.06843: AX: 0201, BX: 2000, CX: 010E, DX: 0000
27600:00:13:81.06850: CS: 0000, DS: 0000, ES: 0070, SS: 0000
27700:00:13:81.06867: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 2000
27800:00:13:81.06871: IP: 7E03, FLAGS: F202
27900:00:13:81.06879: FLAGSINFO:c1p0a0zstIdo1111 
28000:00:13:81.06889: Interrupt status: 0000000000000010
28100:00:13:81.06894: VGA@289,90(CRT:316,124)
28200:00:13:81.06898: Display=801,471
283
28400:00:13:81.06975: Function 02 called.
28500:00:13:81.07088: Read 1/1 sectors from drive 00, start 49. Requested: Head: 0, Track: 1, Sector: 14. Start sector: 49, Destination: ES:BX=0070:00002000
28600:00:13:81.08118: 0000:7E03 (CD13)INT 13
28700:00:13:81.08121: Registers:
28800:00:13:81.08129: AX: 0201, BX: 2200, CX: 010F, DX: 0000
28900:00:13:81.08137: CS: 0000, DS: 0000, ES: 0070, SS: 0000
29000:00:13:81.08144: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 2200
29100:00:13:81.08149: IP: 7E03, FLAGS: F206
29200:00:13:81.08157: FLAGSINFO:c1P0a0zstIdo1111 
29300:00:13:81.08166: Interrupt status: 0000000000000010
29400:00:13:81.08171: VGA@632,97(CRT:659,131)
29500:00:13:81.08175: Display=801,471
296
29700:00:13:81.08255: Function 02 called.
29800:00:13:81.08410: Read 1/1 sectors from drive 00, start 50. Requested: Head: 0, Track: 1, Sector: 15. Start sector: 50, Destination: ES:BX=0070:00002200
29900:00:13:81.09419: 0000:7E03 (CD13)INT 13
30000:00:13:81.09423: Registers:
30100:00:13:81.09430: AX: 0201, BX: 2400, CX: 0110, DX: 0000
30200:00:13:81.09438: CS: 0000, DS: 0000, ES: 0070, SS: 0000
30300:00:13:81.09446: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 2400
30400:00:13:81.09451: IP: 7E03, FLAGS: F202
30500:00:13:81.09459: FLAGSINFO:c1p0a0zstIdo1111 
30600:00:13:81.09468: Interrupt status: 0000000000000010
30700:00:13:81.09473: VGA@61,105(CRT:88,139)
30800:00:13:81.09477: Display=801,471
309
31000:00:13:81.09557: Function 02 called.
31100:00:13:81.09679: Read 1/1 sectors from drive 00, start 51. Requested: Head: 0, Track: 1, Sector: 16. Start sector: 51, Destination: ES:BX=0070:00002400
31200:00:13:82.00675: 0000:7E03 (CD13)INT 13
31300:00:13:82.00678: Registers:
31400:00:13:82.00686: AX: 0201, BX: 2600, CX: 0111, DX: 0000
31500:00:13:82.00694: CS: 0000, DS: 0000, ES: 0070, SS: 0000
31600:00:13:82.00702: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 2600
31700:00:13:82.00706: IP: 7E03, FLAGS: F206
31800:00:13:82.00715: FLAGSINFO:c1P0a0zstIdo1111 
31900:00:13:82.00724: Interrupt status: 0000000000000010
32000:00:13:82.00729: VGA@407,112(CRT:434,146)
32100:00:13:82.00739: Display=801,471
322
32300:00:13:82.00846: Function 02 called.
32400:00:13:82.00959: Read 1/1 sectors from drive 00, start 52. Requested: Head: 0, Track: 1, Sector: 17. Start sector: 52, Destination: ES:BX=0070:00002600
32500:00:13:82.01973: 0000:7E03 (CD13)INT 13
32600:00:13:82.01976: Registers:
32700:00:13:82.01984: AX: 0201, BX: 2800, CX: 0112, DX: 0000
32800:00:13:82.01992: CS: 0000, DS: 0000, ES: 0070, SS: 0000
32900:00:13:82.02000: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 2800
33000:00:13:82.02005: IP: 7E03, FLAGS: F206
33100:00:13:82.02014: FLAGSINFO:c1P0a0zstIdo1111 
33200:00:13:82.02023: Interrupt status: 0000000000000010
33300:00:13:82.02038: VGA@726,119(CRT:753,153)
33400:00:13:82.02042: Display=801,471
335
33600:00:13:82.02158: Function 02 called.
33700:00:13:82.02270: Read 1/1 sectors from drive 00, start 53. Requested: Head: 0, Track: 1, Sector: 18. Start sector: 53, Destination: ES:BX=0070:00002800
33800:00:13:82.03274: 0000:7E03 (CD13)INT 13
33900:00:13:82.03277: Registers:
34000:00:13:82.03286: AX: 0201, BX: 2A00, CX: 0101, DX: 0100
34100:00:13:82.03304: CS: 0000, DS: 0000, ES: 0070, SS: 0000
34200:00:13:82.03312: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 2A00
34300:00:13:82.03317: IP: 7E03, FLAGS: F202
34400:00:13:82.03334: FLAGSINFO:c1p0a0zstIdo1111 
34500:00:13:82.03343: Interrupt status: 0000000000000010
34600:00:13:82.03349: VGA@178,127(CRT:205,161)
34700:00:13:82.03353: Display=801,471
348
34900:00:13:82.03447: Function 02 called.
35000:00:13:82.03588: Read 1/1 sectors from drive 00, start 54. Requested: Head: 1, Track: 1, Sector: 1. Start sector: 54, Destination: ES:BX=0070:00002A00
35100:00:13:82.04618: 0000:7E03 (CD13)INT 13
35200:00:13:82.04621: Registers:
35300:00:13:82.04629: AX: 0201, BX: 2C00, CX: 0102, DX: 0100
35400:00:13:82.04636: CS: 0000, DS: 0000, ES: 0070, SS: 0000
35500:00:13:82.04644: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 2C00
35600:00:13:82.04649: IP: 7E03, FLAGS: F202
35700:00:13:82.04657: FLAGSINFO:c1p0a0zstIdo1111 
35800:00:13:82.04666: Interrupt status: 0000000000000010
35900:00:13:82.04672: VGA@516,134(CRT:543,168)
36000:00:13:82.04676: Display=801,471
361
36200:00:13:82.04753: Function 02 called.
36300:00:13:82.04867: Read 1/1 sectors from drive 00, start 55. Requested: Head: 1, Track: 1, Sector: 2. Start sector: 55, Destination: ES:BX=0070:00002C00
36400:00:13:82.05888: 0000:7E03 (CD13)INT 13
36500:00:13:82.05891: Registers:
36600:00:13:82.05899: AX: 0201, BX: 2E00, CX: 0103, DX: 0100
36700:00:13:82.05907: CS: 0000, DS: 0000, ES: 0070, SS: 0000
36800:00:13:82.05914: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 2E00
36900:00:13:82.05919: IP: 7E03, FLAGS: F206
37000:00:13:82.05928: FLAGSINFO:c1P0a0zstIdo1111 
37100:00:13:82.05937: Interrupt status: 0000000000000010
37200:00:13:82.05942: VGA@865,142(CRT:0,176)
37300:00:13:82.05945: Display=801,471
374
37500:00:13:82.06030: Function 02 called.
37600:00:13:82.06141: Read 1/1 sectors from drive 00, start 56. Requested: Head: 1, Track: 1, Sector: 3. Start sector: 56, Destination: ES:BX=0070:00002E00
37700:00:13:82.07183: 0000:7E03 (CD13)INT 13
37800:00:13:82.07187: Registers:
37900:00:13:82.07195: AX: 0201, BX: 3000, CX: 0104, DX: 0100
38000:00:13:82.07202: CS: 0000, DS: 0000, ES: 0070, SS: 0000
38100:00:13:82.07210: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 3000
38200:00:13:82.07215: IP: 7E03, FLAGS: F202
38300:00:13:82.07223: FLAGSINFO:c1p0a0zstIdo1111 
38400:00:13:82.07233: Interrupt status: 0000000000000010
38500:00:13:82.07238: VGA@293,149(CRT:320,183)
38600:00:13:82.07242: Display=801,471
387
38800:00:13:82.07319: Function 02 called.
38900:00:13:82.07516: Read 1/1 sectors from drive 00, start 57. Requested: Head: 1, Track: 1, Sector: 4. Start sector: 57, Destination: ES:BX=0070:00003000
39000:00:13:82.08567: 0000:7E03 (CD13)INT 13
39100:00:13:82.08570: Registers:
39200:00:13:82.08578: AX: 0201, BX: 3200, CX: 0105, DX: 0100
39300:00:13:82.08586: CS: 0000, DS: 0000, ES: 0070, SS: 0000
39400:00:13:82.08594: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 3200
39500:00:13:82.08598: IP: 7E03, FLAGS: F206
39600:00:13:82.08607: FLAGSINFO:c1P0a0zstIdo1111 
39700:00:13:82.08616: Interrupt status: 0000000000000010
39800:00:13:82.08622: VGA@645,156(CRT:672,190)
39900:00:13:82.08625: Display=801,471
400
40100:00:13:82.08749: Function 02 called.
40200:00:13:82.08865: Read 1/1 sectors from drive 00, start 58. Requested: Head: 1, Track: 1, Sector: 5. Start sector: 58, Destination: ES:BX=0070:00003200
40300:00:13:82.09900: 0000:7E03 (CD13)INT 13
40400:00:13:82.09904: Registers:
40500:00:13:82.09912: AX: 0201, BX: 3400, CX: 0106, DX: 0100
40600:00:13:82.09919: CS: 0000, DS: 0000, ES: 0070, SS: 0000
40700:00:13:82.09927: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 3400
40800:00:13:82.09932: IP: 7E03, FLAGS: F206
40900:00:13:82.09940: FLAGSINFO:c1P0a0zstIdo1111 
41000:00:13:82.09950: Interrupt status: 0000000000000010
41100:00:13:82.09955: VGA@82,164(CRT:109,198)
41200:00:13:82.09959: Display=801,471
413
41400:00:13:83.00038: Function 02 called.
41500:00:13:83.00153: Read 1/1 sectors from drive 00, start 59. Requested: Head: 1, Track: 1, Sector: 6. Start sector: 59, Destination: ES:BX=0070:00003400
41600:00:13:83.01170: 0000:7E03 (CD13)INT 13
41700:00:13:83.01174: Registers:
41800:00:13:83.01182: AX: 0201, BX: 3600, CX: 0107, DX: 0100
41900:00:13:83.01190: CS: 0000, DS: 0000, ES: 0070, SS: 0000
42000:00:13:83.01197: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 3600
42100:00:13:83.01202: IP: 7E03, FLAGS: F202
42200:00:13:83.01210: FLAGSINFO:c1p0a0zstIdo1111 
42300:00:13:83.01220: Interrupt status: 0000000000000010
42400:00:13:83.01225: VGA@437,171(CRT:464,205)
42500:00:13:83.01229: Display=801,471
426
42700:00:13:83.01310: Function 02 called.
42800:00:13:83.01423: Read 1/1 sectors from drive 00, start 60. Requested: Head: 1, Track: 1, Sector: 7. Start sector: 60, Destination: ES:BX=0070:00003600
42900:00:13:84.01028: 0000:7E03 (CD13)INT 13
43000:00:13:84.01042: Registers:
43100:00:13:84.01050: AX: 0201, BX: 3800, CX: 0108, DX: 0100
43200:00:13:84.01058: CS: 0000, DS: 0000, ES: 0070, SS: 0000
43300:00:13:84.01065: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 3800
43400:00:13:84.01070: IP: 7E03, FLAGS: F202
43500:00:13:84.01079: FLAGSINFO:c1p0a0zstIdo1111 
43600:00:13:84.01088: Interrupt status: 0000000000000010
43700:00:13:84.01093: VGA@775,179(CRT:0,213)
43800:00:13:84.01097: Display=801,471
439
44000:00:13:84.01190: Function 02 called.
44100:00:13:84.01374: Read 1/1 sectors from drive 00, start 61. Requested: Head: 1, Track: 1, Sector: 8. Start sector: 61, Destination: ES:BX=0070:00003800
44200:00:13:84.02646: 0000:7E03 (CD13)INT 13
44300:00:13:84.02650: Registers:
44400:00:13:84.02657: AX: 0201, BX: 3A00, CX: 0109, DX: 0100
44500:00:13:84.02665: CS: 0000, DS: 0000, ES: 0070, SS: 0000
44600:00:13:84.02672: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 3A00
44700:00:13:84.02677: IP: 7E03, FLAGS: F206
44800:00:13:84.02685: FLAGSINFO:c1P0a0zstIdo1111 
44900:00:13:84.02695: Interrupt status: 0000000000000010
45000:00:13:84.02700: VGA@236,186(CRT:263,220)
45100:00:13:84.02704: Display=801,471
452
45300:00:13:84.02786: Function 02 called.
45400:00:13:84.02924: Read 1/1 sectors from drive 00, start 62. Requested: Head: 1, Track: 1, Sector: 9. Start sector: 62, Destination: ES:BX=0070:00003A00
45500:00:13:84.03940: 0000:7E03 (CD13)INT 13
45600:00:13:84.03945: Registers:
45700:00:13:84.03954: AX: 0201, BX: 3C00, CX: 010A, DX: 0100
45800:00:13:84.03971: CS: 0000, DS: 0000, ES: 0070, SS: 0000
45900:00:13:84.03989: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 3C00
46000:00:13:84.03994: IP: 7E03, FLAGS: F206
46100:00:13:84.04011: FLAGSINFO:c1P0a0zstIdo1111 
46200:00:13:84.04031: Interrupt status: 0000000000000010
46300:00:13:84.04045: VGA@582,193(CRT:609,227)
46400:00:13:84.04049: Display=801,471
465
46600:00:13:84.04192: Function 02 called.
46700:00:13:84.04306: Read 1/1 sectors from drive 00, start 63. Requested: Head: 1, Track: 1, Sector: 10. Start sector: 63, Destination: ES:BX=0070:00003C00
46800:00:13:84.05444: 0000:7E03 (CD13)INT 13
46900:00:13:84.05457: Registers:
47000:00:13:84.05464: AX: 0201, BX: 3E00, CX: 010B, DX: 0100
47100:00:13:84.05472: CS: 0000, DS: 0000, ES: 0070, SS: 0000
47200:00:13:84.05480: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 3E00
47300:00:13:84.05484: IP: 7E03, FLAGS: F202
47400:00:13:84.05492: FLAGSINFO:c1p0a0zstIdo1111 
47500:00:13:84.05501: Interrupt status: 0000000000000010
47600:00:13:84.05506: VGA@25,201(CRT:52,235)
47700:00:13:84.05510: Display=801,471
478
47900:00:13:84.05588: Function 02 called.
48000:00:13:84.05698: Read 1/1 sectors from drive 00, start 64. Requested: Head: 1, Track: 1, Sector: 11. Start sector: 64, Destination: ES:BX=0070:00003E00
48100:00:13:84.06781: 0000:7E03 (CD13)INT 13
48200:00:13:84.06784: Registers:
48300:00:13:84.06792: AX: 0201, BX: 4000, CX: 010C, DX: 0100
48400:00:13:84.06800: CS: 0000, DS: 0000, ES: 0070, SS: 0000
48500:00:13:84.06807: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 4000
48600:00:13:84.06812: IP: 7E03, FLAGS: F206
48700:00:13:84.06830: FLAGSINFO:c1P0a0zstIdo1111 
48800:00:13:84.06840: Interrupt status: 0000000000000010
48900:00:13:84.06845: VGA@342,208(CRT:369,242)
49000:00:13:84.06849: Display=801,471
491
49200:00:13:84.06958: Function 02 called.
49300:00:13:84.07083: Read 1/1 sectors from drive 00, start 65. Requested: Head: 1, Track: 1, Sector: 12. Start sector: 65, Destination: ES:BX=0070:00004000
49400:00:13:84.08186: 0000:7E03 (CD13)INT 13
49500:00:13:84.08189: Registers:
49600:00:13:84.08197: AX: 0201, BX: 4200, CX: 010D, DX: 0100
49700:00:13:84.08204: CS: 0000, DS: 0000, ES: 0070, SS: 0000
49800:00:13:84.08212: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 4200
49900:00:13:84.08216: IP: 7E03, FLAGS: F202
50000:00:13:84.08225: FLAGSINFO:c1p0a0zstIdo1111 
50100:00:13:84.08234: Interrupt status: 0000000000000010
50200:00:13:84.08239: VGA@682,215(CRT:709,249)
50300:00:13:84.08243: Display=801,471
504
50500:00:13:84.08318: Function 02 called.
50600:00:13:84.08461: Read 1/1 sectors from drive 00, start 66. Requested: Head: 1, Track: 1, Sector: 13. Start sector: 66, Destination: ES:BX=0070:00004200
50700:00:13:84.09478: 0000:7E03 (CD13)INT 13
50800:00:13:84.09481: Registers:
50900:00:13:84.09489: AX: 0201, BX: 4400, CX: 010E, DX: 0100
51000:00:13:84.09497: CS: 0000, DS: 0000, ES: 0070, SS: 0000
51100:00:13:84.09504: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 4400
51200:00:13:84.09509: IP: 7E03, FLAGS: F202
51300:00:13:84.09517: FLAGSINFO:c1p0a0zstIdo1111 
51400:00:13:84.09527: Interrupt status: 0000000000000010
51500:00:13:84.09532: VGA@107,223(CRT:134,257)
51600:00:13:84.09536: Display=801,471
517
51800:00:13:84.09620: Function 02 called.
51900:00:13:84.09732: Read 1/1 sectors from drive 00, start 67. Requested: Head: 1, Track: 1, Sector: 14. Start sector: 67, Destination: ES:BX=0070:00004400
52000:00:13:85.00752: 0000:7E03 (CD13)INT 13
52100:00:13:85.00755: Registers:
52200:00:13:85.00763: AX: 0201, BX: 4600, CX: 010F, DX: 0100
52300:00:13:85.00771: CS: 0000, DS: 0000, ES: 0070, SS: 0000
52400:00:13:85.00779: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 4600
52500:00:13:85.00784: IP: 7E03, FLAGS: F206
52600:00:13:85.00792: FLAGSINFO:c1P0a0zstIdo1111 
52700:00:13:85.00802: Interrupt status: 0000000000000010
52800:00:13:85.00807: VGA@450,230(CRT:477,264)
52900:00:13:85.00811: Display=801,471
530
53100:00:13:85.00888: Function 02 called.
53200:00:13:85.01006: Read 1/1 sectors from drive 00, start 68. Requested: Head: 1, Track: 1, Sector: 15. Start sector: 68, Destination: ES:BX=0070:00004600
53300:00:13:85.02043: 0000:7E03 (CD13)INT 13
53400:00:13:85.02046: Registers:
53500:00:13:85.02054: AX: 0201, BX: 4800, CX: 0110, DX: 0100
53600:00:13:85.02062: CS: 0000, DS: 0000, ES: 0070, SS: 0000
53700:00:13:85.02070: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 4800
53800:00:13:85.02074: IP: 7E03, FLAGS: F202
53900:00:13:85.02083: FLAGSINFO:c1p0a0zstIdo1111 
54000:00:13:85.02092: Interrupt status: 0000000000000010
54100:00:13:85.02097: VGA@776,238(CRT:0,272)
54200:00:13:85.02101: Display=801,471
543
54400:00:13:85.02179: Function 02 called.
54500:00:13:85.02293: Read 1/1 sectors from drive 00, start 69. Requested: Head: 1, Track: 1, Sector: 16. Start sector: 69, Destination: ES:BX=0070:00004800
54600:00:13:85.03302: 0000:7E03 (CD13)INT 13
54700:00:13:85.03305: Registers:
54800:00:13:85.03313: AX: 0201, BX: 4A00, CX: 0111, DX: 0100
54900:00:13:85.03320: CS: 0000, DS: 0000, ES: 0070, SS: 0000
55000:00:13:85.03328: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 4A00
55100:00:13:85.03333: IP: 7E03, FLAGS: F206
55200:00:13:85.03341: FLAGSINFO:c1P0a0zstIdo1111 
55300:00:13:85.03351: Interrupt status: 0000000000000010
55400:00:13:85.03356: VGA@225,245(CRT:252,279)
55500:00:13:85.03360: Display=801,471
556
55700:00:13:85.03441: Function 02 called.
55800:00:13:85.03554: Read 1/1 sectors from drive 00, start 70. Requested: Head: 1, Track: 1, Sector: 17. Start sector: 70, Destination: ES:BX=0070:00004A00
55900:00:13:85.04559: 0000:7E03 (CD13)INT 13
56000:00:13:85.04562: Registers:
56100:00:13:85.04570: AX: 0201, BX: 4C00, CX: 0112, DX: 0100
56200:00:13:85.04578: CS: 0000, DS: 0000, ES: 0070, SS: 0000
56300:00:13:85.04586: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 4C00
56400:00:13:85.04591: IP: 7E03, FLAGS: F206
56500:00:13:85.04599: FLAGSINFO:c1P0a0zstIdo1111 
56600:00:13:85.04608: Interrupt status: 0000000000000010
56700:00:13:85.04614: VGA@550,252(CRT:577,286)
56800:00:13:85.04617: Display=801,471
569
57000:00:13:85.04694: Function 02 called.
57100:00:13:85.04806: Read 1/1 sectors from drive 00, start 71. Requested: Head: 1, Track: 1, Sector: 18. Start sector: 71, Destination: ES:BX=0070:00004C00
57200:00:13:85.05787: 0000:7E03 (CD13)INT 13
57300:00:13:85.05790: Registers:
57400:00:13:85.05798: AX: 0201, BX: 4E00, CX: 0201, DX: 0000
57500:00:13:85.05806: CS: 0000, DS: 0000, ES: 0070, SS: 0000
57600:00:13:85.05814: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 4E00
57700:00:13:85.05818: IP: 7E03, FLAGS: F202
57800:00:13:85.05827: FLAGSINFO:c1p0a0zstIdo1111 
57900:00:13:85.05836: Interrupt status: 0000000000000010
58000:00:13:85.05841: VGA@896,260(CRT:23,294)
58100:00:13:85.05845: Display=801,471
582
58300:00:13:85.05927: Function 02 called.
58400:00:13:85.06039: Read 1/1 sectors from drive 00, start 72. Requested: Head: 0, Track: 2, Sector: 1. Start sector: 72, Destination: ES:BX=0070:00004E00
58500:00:13:85.07016: 0000:7E03 (CD13)INT 13
58600:00:13:85.07020: Registers:
58700:00:13:85.07027: AX: 0201, BX: 5000, CX: 0202, DX: 0000
58800:00:13:85.07035: CS: 0000, DS: 0000, ES: 0070, SS: 0000
58900:00:13:85.07043: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 5000
59000:00:13:85.07048: IP: 7E03, FLAGS: F202
59100:00:13:85.07056: FLAGSINFO:c1p0a0zstIdo1111 
59200:00:13:85.07065: Interrupt status: 0000000000000010
59300:00:13:85.07071: VGA@322,267(CRT:349,301)
59400:00:13:85.07075: Display=801,471
595
59600:00:13:85.07155: Function 02 called.
59700:00:13:85.07268: Read 1/1 sectors from drive 00, start 73. Requested: Head: 0, Track: 2, Sector: 2. Start sector: 73, Destination: ES:BX=0070:00005000
59800:00:13:85.08277: 0000:7E03 (CD13)INT 13
59900:00:13:85.08280: Registers:
60000:00:13:85.08288: AX: 0201, BX: 5200, CX: 0203, DX: 0000
60100:00:13:85.08296: CS: 0000, DS: 0000, ES: 0070, SS: 0000
60200:00:13:85.08303: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 5200
60300:00:13:85.08308: IP: 7E03, FLAGS: F206
60400:00:13:85.08316: FLAGSINFO:c1P0a0zstIdo1111 
60500:00:13:85.08326: Interrupt status: 0000000000000010
60600:00:13:85.08331: VGA@671,274(CRT:698,308)
60700:00:13:85.08335: Display=801,471
608
60900:00:13:85.08412: Function 02 called.
61000:00:13:85.08525: Read 1/1 sectors from drive 00, start 74. Requested: Head: 0, Track: 2, Sector: 3. Start sector: 74, Destination: ES:BX=0070:00005200
61100:00:13:85.09542: 0000:7E03 (CD13)INT 13
61200:00:13:85.09545: Registers:
61300:00:13:85.09553: AX: 0201, BX: 5400, CX: 0204, DX: 0000
61400:00:13:85.09561: CS: 0000, DS: 0000, ES: 0070, SS: 0000
61500:00:13:85.09568: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 5400
61600:00:13:85.09573: IP: 7E03, FLAGS: F202
61700:00:13:85.09581: FLAGSINFO:c1p0a0zstIdo1111 
61800:00:13:85.09590: Interrupt status: 0000000000000010
61900:00:13:85.09596: VGA@105,282(CRT:132,316)
62000:00:13:85.09599: Display=801,471
621
62200:00:13:85.09676: Function 02 called.
62300:00:13:85.09787: Read 1/1 sectors from drive 00, start 75. Requested: Head: 0, Track: 2, Sector: 4. Start sector: 75, Destination: ES:BX=0070:00005400
62400:00:13:86.00841: 0000:7E03 (CD13)INT 13
62500:00:13:86.00844: Registers:
62600:00:13:86.00852: AX: 0201, BX: 5600, CX: 0205, DX: 0000
62700:00:13:86.00859: CS: 0000, DS: 0000, ES: 0070, SS: 0000
62800:00:13:86.00867: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 5600
62900:00:13:86.00872: IP: 7E03, FLAGS: F206
63000:00:13:86.00880: FLAGSINFO:c1P0a0zstIdo1111 
63100:00:13:86.00889: Interrupt status: 0000000000000010
63200:00:13:86.00894: VGA@457,289(CRT:484,323)
63300:00:13:86.00898: Display=801,471
634
63500:00:13:86.00975: Function 02 called.
63600:00:13:86.01087: Read 1/1 sectors from drive 00, start 76. Requested: Head: 0, Track: 2, Sector: 5. Start sector: 76, Destination: ES:BX=0070:00005600
63700:00:13:86.02166: 0000:7E03 (CD13)INT 13
63800:00:13:86.02169: Registers:
63900:00:13:86.02177: AX: 0201, BX: 5800, CX: 0206, DX: 0000
64000:00:13:86.02185: CS: 0000, DS: 0000, ES: 0070, SS: 0000
64100:00:13:86.02192: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 5800
64200:00:13:86.02197: IP: 7E03, FLAGS: F206
64300:00:13:86.02205: FLAGSINFO:c1P0a0zstIdo1111 
64400:00:13:86.02214: Interrupt status: 0000000000000010
64500:00:13:86.02219: VGA@792,297(CRT:0,331)
64600:00:13:86.02223: Display=801,471
647
64800:00:13:86.02300: Function 02 called.
64900:00:13:86.02411: Read 1/1 sectors from drive 00, start 77. Requested: Head: 0, Track: 2, Sector: 6. Start sector: 77, Destination: ES:BX=0070:00005800
65000:00:13:86.03435: 0000:7E03 (CD13)INT 13
65100:00:13:86.03438: Registers:
65200:00:13:86.03459: AX: 0201, BX: 5A00, CX: 0207, DX: 0000
65300:00:13:86.03478: CS: 0000, DS: 0000, ES: 0070, SS: 0000
65400:00:13:86.03494: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 5A00
65500:00:13:86.03499: IP: 7E03, FLAGS: F202
65600:00:13:86.03507: FLAGSINFO:c1p0a0zstIdo1111 
65700:00:13:86.03516: Interrupt status: 0000000000000010
65800:00:13:86.03521: VGA@250,304(CRT:277,338)
65900:00:13:86.03525: Display=801,471
660
66100:00:13:86.03606: Function 02 called.
66200:00:13:86.03717: Read 1/1 sectors from drive 00, start 78. Requested: Head: 0, Track: 2, Sector: 7. Start sector: 78, Destination: ES:BX=0070:00005A00
66300:00:13:86.04725: 0000:7E03 (CD13)INT 13
66400:00:13:86.04729: Registers:
66500:00:13:86.04736: AX: 0201, BX: 5C00, CX: 0208, DX: 0000
66600:00:13:86.04744: CS: 0000, DS: 0000, ES: 0070, SS: 0000
66700:00:13:86.04752: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 5C00
66800:00:13:86.04756: IP: 7E03, FLAGS: F202
66900:00:13:86.04764: FLAGSINFO:c1p0a0zstIdo1111 
67000:00:13:86.04774: Interrupt status: 0000000000000010
67100:00:13:86.04779: VGA@593,311(CRT:620,345)
67200:00:13:86.04782: Display=801,471
673
67400:00:13:86.04857: Function 02 called.
67500:00:13:86.05006: Read 1/1 sectors from drive 00, start 79. Requested: Head: 0, Track: 2, Sector: 8. Start sector: 79, Destination: ES:BX=0070:00005C00
67600:00:13:87.05170: 0000:7E03 (CD13)INT 13
67700:00:13:87.05174: Registers:
67800:00:13:87.05182: AX: 0201, BX: 5E00, CX: 0209, DX: 0000
67900:00:13:87.05190: CS: 0000, DS: 0000, ES: 0070, SS: 0000
68000:00:13:87.05198: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 5E00
68100:00:13:87.05203: IP: 7E03, FLAGS: F206
68200:00:13:87.05211: FLAGSINFO:c1P0a0zstIdo1111 
68300:00:13:87.05221: Interrupt status: 0000000000000010
68400:00:13:87.05226: VGA@42,319(CRT:69,353)
68500:00:13:87.05230: Display=801,471
686
68700:00:13:87.05313: Function 02 called.
68800:00:13:87.05492: Read 1/1 sectors from drive 00, start 80. Requested: Head: 0, Track: 2, Sector: 9. Start sector: 80, Destination: ES:BX=0070:00005E00
68900:00:13:87.06554: 0000:7E03 (CD13)INT 13
69000:00:13:87.06557: Registers:
69100:00:13:87.06565: AX: 0201, BX: 6000, CX: 020A, DX: 0000
69200:00:13:87.06573: CS: 0000, DS: 0000, ES: 0070, SS: 0000
69300:00:13:87.06581: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 6000
69400:00:13:87.06585: IP: 7E03, FLAGS: F206
69500:00:13:87.06594: FLAGSINFO:c1P0a0zstIdo1111 
69600:00:13:87.06603: Interrupt status: 0000000000000010
69700:00:13:87.06608: VGA@367,326(CRT:394,360)
69800:00:13:87.06612: Display=801,471
699
70000:00:13:87.06691: Function 02 called.
70100:00:13:87.06808: Read 1/1 sectors from drive 00, start 81. Requested: Head: 0, Track: 2, Sector: 10. Start sector: 81, Destination: ES:BX=0070:00006000
70200:00:13:87.07827: 0000:7E03 (CD13)INT 13
70300:00:13:87.07831: Registers:
70400:00:13:87.07839: AX: 0201, BX: 6200, CX: 020B, DX: 0000
70500:00:13:87.07846: CS: 0000, DS: 0000, ES: 0070, SS: 0000
70600:00:13:87.07854: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 6200
70700:00:13:87.07859: IP: 7E03, FLAGS: F202
70800:00:13:87.07867: FLAGSINFO:c1p0a0zstIdo1111 
70900:00:13:87.07877: Interrupt status: 0000000000000010
71000:00:13:87.07882: VGA@716,333(CRT:743,367)
71100:00:13:87.07886: Display=801,471
712
71300:00:13:87.07976: Function 02 called.
71400:00:13:87.08093: Read 1/1 sectors from drive 00, start 82. Requested: Head: 0, Track: 2, Sector: 11. Start sector: 82, Destination: ES:BX=0070:00006200
71500:00:13:87.09115: 0000:7E03 (CD13)INT 13
71600:00:13:87.09165: Registers:
71700:00:13:87.09173: AX: 0201, BX: 6400, CX: 020C, DX: 0000
71800:00:13:87.09181: CS: 0000, DS: 0000, ES: 0070, SS: 0000
71900:00:13:87.09189: SP: 7BD6, BP: 7BE2, SI: 0001, DI: 6400
72000:00:13:87.09194: IP: 7E03, FLAGS: F206
72100:00:13:87.09202: FLAGSINFO:c1P0a0zstIdo1111 
72200:00:13:87.09211: Interrupt status: 0000000000000010
72300:00:13:87.09217: VGA@151,341(CRT:178,375)
72400:00:13:87.09221: Display=801,471
725
72600:00:13:87.09311: Function 02 called.
72700:00:13:87.09426: Read 1/1 sectors from drive 00, start 83. Requested: Head: 0, Track: 2, Sector: 12. Start sector: 83, Destination: ES:BX=0070:00006400
72800:00:14:35.09213: 0070:3506 (CD11)INT 11
72900:00:14:35.09218: Registers:
73000:00:14:35.09226: AX: F000, BX: 0021, CX: F000, DX: 0000
73100:00:14:35.09233: CS: 0070, DS: 0000, ES: 0070, SS: 0000
73200:00:14:35.09241: SP: 7BE0, BP: 7BE2, SI: 74E2, DI: 72D4
73300:00:14:35.09246: IP: 3506, FLAGS: F256
73400:00:14:35.09254: FLAGSINFO:c1P0A0ZstIdo1111 
73500:00:14:35.09263: Interrupt status: 0000000000000010
73600:00:14:35.09268: VGA@873,251(CRT:0,285)
73700:00:14:35.09272: Display=801,446
738
73900:00:14:35.09568: 0070:353E (CD15)INT 15
74000:00:14:35.09571: Registers:
74100:00:14:35.09579: AX: C000, BX: 0021, CX: F002, DX: 0000
74200:00:14:35.09587: CS: 0070, DS: 0000, ES: 0070, SS: 0000
74300:00:14:35.09594: SP: 06FC, BP: 7BE2, SI: 74E2, DI: 72D4
74400:00:14:35.09599: IP: 353E, FLAGS: F246
74500:00:14:35.09607: FLAGSINFO:c1P0a0ZstIdo1111 
74600:00:14:35.09616: Interrupt status: 0000000000000010
74700:00:14:35.09622: VGA@580,252(CRT:607,286)
74800:00:14:35.09625: Display=801,446
749
75000:00:14:71.07599: 0000:3C06 (CD11)INT 11
75100:00:14:71.07604: Registers:
75200:00:14:71.07612: AX: CE3C, BX: 0572, CX: 0572, DX: 0000
75300:00:14:71.07620: CS: 0000, DS: 0000, ES: 0000, SS: 0021
75400:00:14:71.07628: SP: 9E1A, BP: E54D, SI: 8BBA, DI: 6D7C
75500:00:14:71.07633: IP: 3C06, FLAGS: F246
75600:00:14:71.07641: FLAGSINFO:c1P0a0ZstIdo1111 
75700:00:14:71.07651: Interrupt status: 0000000000000010
75800:00:14:71.07657: VGA@405,387(CRT:432,421)
75900:00:14:71.07661: Display=801,446
760

After that, logging stops, so there's something wrong there(0000:3C06 INT 11h instruction)? It seems to have returned to the same instruction(0000:3C06===0070:3506)?

Author of the UniPCemu emulator.
UniPCemu Git repository
UniPCemu for Android, Windows, PSP, Vita and Switch on itch.io

Reply 12 of 14, by peterferrie

Posted on 2016-07-14, 16:05

peterferrie Offline

Rank Oldbie

Rank: Oldbie
Posts: 649
Joined: 2008-05-08, 21:54

By that point, the int 10h has been bypassed.
Here's the relevant flow:

13504                 int     11h
2...
3353A                 mov     ah, 0C0h
4353C                 int     15h
5...
63568                 call    41B0
7...
841B0                 push    ds
941B1                 push    cs
1041B2                 pop     ds
1141B3                 push    si
1241B4                 mov     si, 1DB2h
1341B7                 lodsb
1441B8                 cmp     al, 0
1541BA                 jz      41C7
1641BC                 push    bx
1741BD                 mov     bx, 7
1841C0                 mov     ah, 0Eh
1941C2                 int     10h

Is 70:1DB2 empty for you? That's where the "NEC" message lives, but if it's not there, then that's why nothing is printed, and suggests a loading problem.
There's not supposed to be an int 11h at 3C06h. I would guess that some wrong sectors have been loaded into memory, because there's an int 11h at 3506h.

Reply 13 of 14, by superfury

Posted on 2016-07-14, 20:07

superfury Offline

Rank l33t++

Rank: l33t++
Posts: 5848
Joined: 2014-03-08, 11:25
Location: Netherlands

Looking at the log createn with the most recent commit(fixing lots of errors in SDL2 and SDL compatibility layer, making SDL2 work with joysticks correctly), I notice that, for some reason, the INT 15h jumps to bogus memory(0000:0000), as the bytes at address 0000:0054h contain zeroes.

After looking at the place the interrupt is set up(BIOS POST handler used in the emulation), I find that the switch statement, which handles the seperate cases for different kind of code in the BIOS, was missing the special statement added for the interrupt 15h handler. Adding this statement makes MS-DOS 3.3 boot up to the point it asks for the current date/time. Now I just need to fix the input mechanism(since it won't see anything I type using that BIOS).

Looking at the code inserted into the custom BIOS ROM, I notice that the IRQ1 handler uses a INT 15h, but the INT 15h handler returns using the RETF 2 instruction? Won't this give problems with the Dosbox' interrupt handling? I notice that enabling the IRQ1 handler crashes the MS-DOS boot sequence? Anyone can see what's going wrong?

Interrupt 15h handler itself: https://bitbucket.org/superfury/x86emu/src/c1 … t15.c?at=master
Setup of the handlers: https://bitbucket.org/superfury/x86emu/src/c1 … ost.c?at=master
Callback code generator: https://bitbucket.org/superfury/x86emu/src/c1 … ger.c?at=master
Interrupt 16h, IRQ1 and support: https://bitbucket.org/superfury/x86emu/src/c1 … t16.c?at=master

Interrupt 15h is wrapped using a zero callback, as usually, which returns with a RETF 2 instead of IRET(like the other interrupt handlers), leaving interrupts disabled?

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UniPCemu for Android, Windows, PSP, Vita and Switch on itch.io

Reply 14 of 14, by superfury

Posted on 2016-07-15, 10:11

superfury Offline

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I notice that there's a little problem with the way the Dosbox IRQ1&INT16h handler process things, combined with the custom INT15h handler.

- Interrupt 15h now sets the carry flag to indicate that the BIOS should translate the scancode.
- The IRQ1 handler (Dosbox-based) now properly skips the callback when the carry flag is cleared(indicating custom int15h handler function 4Fh).
- Interrupt 15h is reverted to it's normal interrupt handler.
- Interrupt 16h now properly sets the interrupt flag using the CALLBACK_SIF function, instead of writing the (incorrect) current interrupt flag(FLAG_IF macro, which is always zero, because we're running an interrupt) OR'ed into the flags on the stack directly to the stack.

I notice that when booting MS-DOS 3.3 and asking for the time, I can enter exactly 1 key. After that it becomes unresponsive to keyboard input(although MS-DOS just displays the next question(requesting the current time) when pressing enter, or when pressing e.g. 1, it displays the 1)). Is there a problem with the interrupt 16h handler?

Author of the UniPCemu emulator.
UniPCemu Git repository
UniPCemu for Android, Windows, PSP, Vita and Switch on itch.io

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