Please add what exact graphics card and gfx bios you used.

My Graphics Card:
ASUS EN7300TC512
NVIDIA GeForce 7300 LE
My Graphics BIOS in file v_bios.bin.
Scroll supported on all CGA, EGA, VGA and SVGA cards. MDA and Hercules -- i don't know.
CGA/EGA emulation in text modes (int 10h, function 12h, subfunction 30h) supported on all VGA and SVGA cards.

Phase change between signals in file snd.wav (MS-DOS).

I think #2 is more of a "not implemented" thing than a bug. I only know of one game that needs it.

Yes, cga/ega emulation functionality under vga type machines is quite useless,
if you want the different appearance just use the respective machine type.

Dunno about negative scrolling values (text mode only?) as they should be
plain unsigned values, but may be interesting.

On CGA machines i can't load font for text modes.

In graphics modes too. Video memory as a ring.

Any game that actually uses such functionality?

Old russian games which directly accessed hardware CGA registers in text modes. These games works correctly only on russian PC-XT machines with CGA cards (with russian symbol generators).

You can load some graphics bios in dosbox (ldgfxrom in debugger-enabled build),
like the elpin bios that comes with bochs.

1	/*regular setup*/
2	PROGRAMS_MakeFile("MOUNT.COM",MOUNT_ProgramStart);
3	PROGRAMS_MakeFile("MEM.COM",MEM_ProgramStart);
4	PROGRAMS_MakeFile("LOADFIX.COM",LOADFIX_ProgramStart);
5	PROGRAMS_MakeFile("RESCAN.COM",RESCAN_ProgramStart);
6	PROGRAMS_MakeFile("INTRO.COM",INTRO_ProgramStart);
7	PROGRAMS_MakeFile("BOOT.COM",BOOT_ProgramStart);
8#if C_DEBUG
9	PROGRAMS_MakeFile("LDGFXROM.COM", LDGFXROM_ProgramStart);
10#endif
11	PROGRAMS_MakeFile("IMGMOUNT.COM", IMGMOUNT_ProgramStart);
12	PROGRAMS_MakeFile("KEYB.COM", KEYB_ProgramStart);

Please give me debug compilation with LDGFXROM.COM.

SoftCat wrote:

Please give me debug compilation with LDGFXROM.COM.

Seriously, it's not that hard to find

Kippesoep wrote:

Seriously, it\'s not that hard to find

Thank you very much.

How i can load font for text modes on CGA machine? With ldgfxrom?

You can't.

ldgfxrom can load a custom graphics bios, which (for example in the case
of elpin) may provide cga/ega emulation capabilities under vga.

How i can do this? Before starting "DOS" in DOSBox?

Nope, on the dosbox prompt. Something like "ldgfxrom vgabios.rom"

wd wrote:

Nope, on the dosbox prompt. Something like "ldgfxrom vgabios.rom"

Thank you very much.

Again bug.
4) Incorrect scroll for POSITIVE values of registers 0Ch, 0Dh of port 3D5h on CGA machine.
See scroll2.zip
Test program: hs2.com
Results:
hs2_vga.gif -- DOSBox video of vgaonly machine correct scroll (register := register + 1 <=> address := address + 2)
hs2_cga.gif -- DOSBox video of cga machine incorrect scroll (register := register + 1 <=> address := address + 1)

Could you make one for Hercules? (3bxh instead 3dxh, or use the address that's in the BIOS data area). So I can check real hardware.

Nevermind, I've hex-edited the com file - it works the same as on CGA.