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Always decode CRTC index bit 5 on VGA compatibles. Fixes Joe Montana Football.

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This commit is contained in:
SarahW 2018-04-11 17:00:58 +01:00
commit 4ba11c5a13
4 changed files with 26 additions and 10 deletions
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9
src/vid_paradise.c
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@ -110,12 +110,11 @@ void paradise_out(uint16_t addr, uint8_t val, void *p)
break;
case 0x3D4:
if (paradise->type == PVGA1A)
svga->crtcreg = val & 0x1f;
else
svga->crtcreg = val & 0x3f;
svga->crtcreg = val & 0x3f;
return;
case 0x3D5:
if ((paradise->type == PVGA1A) && (svga->crtcreg & 0x20))
return;
if ((svga->crtcreg < 7) && (svga->crtc[0x11] & 0x80))
return;
if ((svga->crtcreg == 7) && (svga->crtc[0x11] & 0x80))
@ -191,6 +190,8 @@ uint8_t paradise_in(uint16_t addr, void *p)
case 0x3D4:
return svga->crtcreg;
case 0x3D5:
if ((paradise->type == PVGA1A) && (svga->crtcreg & 0x20))
return 0xff;
if (svga->crtcreg > 0x29 && svga->crtcreg < 0x30 && (svga->crtc[0x29] & 0x88) != 0x80)
return 0xff;
return svga->crtc[svga->crtcreg];