Super I/O chip on Gateway 2000 Saturn II boards...
Posted on 2019-07-03, 15:39
Specifically, it's about boards with part number AT486IP2, MBDPCI001AxWW, and MBDPCI002AxWW that I'm trying to emulate. What Super I/O chip did they have?
PCI IRQ steering on 82378IB (original SIO)...
Posted on 2019-06-18, 15:03
I'm trying to emulate a machien with Award BIOS and the original SIO (82378IB). The chip does not have the PCI IRQ steering that was added to the later 82378ZB variant of the SIO, so my question is - how were PCI IRQ's handled on such machines?
Re: Logitech C7 serial mouse power-up sequence
Posted on 2018-11-30, 23:27
I just got reports back from a person who tested the real mouse for me, and basically, when you set DTR active, the mouse raises DSR (and you get a MSR interrupt from the serial port if the serial port is appropriately configured), and when you set RTS active, the mouse raises CTS (and you get a MSR …
Logitech C7 serial mouse power-up sequence
Posted on 2018-11-25, 17:09
What exactly does the Logitech C7 serial mouse do on the power-up sequence? I mean, the sequence appears to be, set DTR active, then set RTS active, then wait for something, but for what? 86Box's emulated mouse right starts a timer when that happens, that sends the 0x4D ('M') but Windows 2000 (and …
Re: 808x MUL/IMUL/DIV/IDIV/REP cycles/operation
Posted on 2018-11-22, 16:04
The number of wait states introduced by a DRAM refresh can be anything from 0 to 6 cycles (assuming no wait state for the refresh memory access itself). The zero case happens when the bus would otherwise be idle. Other cases depending on when the refresh happens with respect to the adjacent CPU bus …
Re: 808x MUL/IMUL/DIV/IDIV/REP cycles/operation
Posted on 2018-11-22, 15:25
So far it appears to run fine, except that the credits have no sound but that's because the emulation of the PIT and the PC speaker leaves a lot to be desired, so it's on my list to be eventually either rewritten or ported from DOSBox where I heard PIT mode 1 (which I presume the credits use) works. …
Re: 808x MUL/IMUL/DIV/IDIV/REP cycles/operation
Posted on 2018-11-22, 13:33
OK, fixed the DMA channel 0 so that it only triggeres refresh read when the DMA is programmed to read or write, reenigne's blog says the BIOS takes care of that, and my logging has verified that that indeed happens, so that's one thing settled. However, my other question remains - what's with that …
Re: 808x MUL/IMUL/DIV/IDIV/REP cycles/operation
Posted on 2018-11-22, 13:17
Also, buffering in non-byte(8088)/word(8086) PIQ prefetches can't be right, especially 20+ bytes at once? The prefetch queue operates correctly, 4 or 6 bytes. It's just that the PCem code (which I started from), calls FETCHADD() (which adds the bytes to the prefetch queue) after the instruction has …
Re: 808x MUL/IMUL/DIV/IDIV/REP cycles/operation
Posted on 2018-11-22, 03:47
After fixing some REP stuff, making DMA 0 always call refreshread() even when the channel is otherwise inactive, and fixing the cycles of LODSW and REP LODSW, 8088mph reports 1642 cycles and this seems to work: http://citadel.ringoflightning.net/20181122_044201.png . However I now have two more …
Re: 808x MUL/IMUL/DIV/IDIV/REP cycles/operation
Posted on 2018-11-22, 01:08
By trap, I mean INT 1, the single-step trap enabled by the T flag. Do those stop the REP on 808x? I know they do from the later steppings of the 386 onwards, and I know they don't on earlier 386 steppings but it's marked as a defect, and I have no idea what happens on 808x and 286.
Re: 808x MUL/IMUL/DIV/IDIV/REP cycles/operation
Posted on 2018-11-21, 23:07
Yes, but what about prefetch queue writes? Those happen at around 4 cycles per write to prefetch queue, for a maximum of 4 writes on 8088, and 6 on 8086. Though I guess I could refactor the code to do that at REP stop due to either condition met or interrupt. Also, does the 8088 stop REP on TRAP? …
Re: 808x MUL/IMUL/DIV/IDIV/REP cycles/operation
Posted on 2018-11-21, 21:15
So the CPU loops like: - Start timer period; - Execute instruction (this includes fetching the opcode); - Fill the prefetch queue based on instruction cycles + memory R/W cycles + any accumulated prefetch-induced cycles*; - Take care of memory R/W cycles if any; - End timer period; - Service trap, …
808x MUL/IMUL/DIV/IDIV/REP cycles/operation
Posted on 2018-11-21, 15:00
I'm currently working on getting 86Box's 808x emulation to at least close to the real thing. Fixed the prefetch queue already (at least enough that the 8088mph credits and Snatch-It now work), and brought the cycles detected by 8088mph to 1637 (not much off from the expected 1678 +/- 10), after …
Re: SB16's MPU-401, and intelligent mode
Posted on 2018-09-11, 17:00
Thanks for the information, going to make the emulator behave accordingly then.
Re: SB16's MPU-401, and intelligent mode
Posted on 2018-09-11, 15:55
The thing is, I don't have a real Sound Blaster 16 (or a real old PC with ISA slots for that matter), that's why I'm asking here.
SB16's MPU-401, and intelligent mode
Posted on 2018-09-11, 14:56
So I'm working on 86Box's MPU-401 emulation again and I recently fixed it to work like the Windows NT 3.5 driver expects it to. This however, raised a question - what mode does the Sound Blaster 16's MPU-401 start in? Intelligent or UART? Based on the driver's source code in the Windows NT 3.5 DDK, …
Re: A problem with playing DOS games under Windows 3.1 on PCem and 86box with the dynamic recomplier on.
Posted on 2018-08-03, 17:26
She said PCem v15 (current stable is v14) is going to have the new recompile already, so it's most likely a matter of months before it's done, not years.
Re: A problem with playing DOS games under Windows 3.1 on PCem and 86box with the dynamic recomplier on.
Posted on 2018-08-03, 14:38
No, she started working on the *new* dynamic recompiler this year. She clearly said so.
Re: A problem with playing DOS games under Windows 3.1 on PCem and 86box with the dynamic recomplier on.
Posted on 2018-08-03, 02:41
The current dynamic recompiler has plenty of bugs. Sarah is working on a new one which will hopefully work better. But it's going to take a while longer before that's committed. If I can address this to Sarahwalker who made PCem (Which is the real version of what emulator I mentioned) Just because …
Re: Sound won't work in Windows 98 SE in 86Box?
Posted on 2018-06-04, 17:02
The option for IDE+PIO is now simply called IDE. I modified your 86box.cfg and pastebinned you the modified one on GitHub, that should work.
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