Retro/pcem
Watch
1
0
Fork
You've already forked pcem
 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Trident TVGA8900D appears to implement port 0x3db as an alternative

Browse source 
clock select. Fixes pixel clocks & refresh rates on this card.
This commit is contained in:
SarahW 2020-10-02 17:21:41 +01:00
commit 2efda3598b
1 changed files with 10 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

10
src/vid_tvga.c
View file

@ -161,6 +161,16 @@ void tvga_out(uint16_t addr, uint8_t val, void *p)
tvga_recalcbanking(tvga);
}
return;
case 0x3DB:
if (tvga->id == TVGA_8900D)
{
/*3db appears to be a 4 bit clock select register on 8900D*/
svga->miscout = (svga->miscout & ~0x0c) | ((val & 3) << 2);
tvga->newctrl2 = (tvga->newctrl2 & ~0x01) | ((val & 4) >> 2);
tvga->oldctrl1 = (tvga->oldctrl1 & ~0x10) | ((val & 8) << 1);
svga_recalctimings(svga);
}
break;
}
svga_out(addr, val, svga);
}