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Tweak accesses to S3 system control and extension registers. Fixes

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banking on some versions of UNIVBE (eg as used by Pro Pinball : The
Web).
This commit is contained in:
SarahW 2020-11-21 20:45:56 +00:00
commit cada868428
1 changed files with 5 additions and 1 deletions
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6
src/vid_s3.c
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@ -999,7 +999,11 @@ void s3_out(uint16_t addr, uint8_t val, void *p)
return;
if ((svga->crtcreg == 7) && (svga->crtc[0x11] & 0x80))
val = (svga->crtc[7] & ~0x10) | (val & 0x10);
if (svga->crtcreg >= 0x20 && svga->crtcreg != 0x38 && (svga->crtc[0x38] & 0xcc) != 0x48) return;
if (svga->crtcreg >= 0x20 && svga->crtcreg != 0x38 && svga->crtcreg != 0x39 && (svga->crtc[0x38] & 0xcc) != 0x48)
{
if (!((svga->crtc[0x39] & 0xe0) == 0xa0 && svga->crtcreg >= 0x40 && svga->crtcreg <= 0x6d))
return;
}
old = svga->crtc[svga->crtcreg];
svga->crtc[svga->crtcreg] = val;
switch (svga->crtcreg)