80486DX2-66/86Box-fork
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Fixed display start address on S3 pre-ViRGE and ViRGE cards upon recalculation of its timings plus when the banking register is enabled, this also fixes the flickering of Quake while having Commander Keen working without glitches.

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TC1995
2021-08-08 13:24:11 +02:00
parent 6f639cd866
commit 74d88ec6bb
2 changed files with 4 additions and 0 deletions
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2
src/video/vid_s3.c
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@@ -2423,6 +2423,8 @@ s3_out(uint16_t addr, uint8_t val, void *p)
if ((svga->crtcreg == 0xc) || (svga->crtcreg == 0xd)) {
svga->fullchange = 3;
svga->ma_latch = ((svga->crtc[0xc] << 8) | svga->crtc[0xd]) + ((svga->crtc[8] & 0x60) >> 5);
if ((((svga->crtc[0x67] & 0xc) != 0xc) && (s3->chip >= S3_TRIO64V)) || (s3->chip < S3_TRIO64V))
svga->ma_latch |= (s3->ma_ext << 16);
} else {
svga->fullchange = changeframecount;
svga_recalctimings(svga);

2
src/video/vid_s3_virge.c
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@@ -586,6 +586,8 @@ static void s3_virge_out(uint16_t addr, uint8_t val, void *p)
if ((svga->crtcreg == 0xc) || (svga->crtcreg == 0xd)) {
svga->fullchange = 3;
svga->ma_latch = ((svga->crtc[0xc] << 8) | svga->crtc[0xd]) + ((svga->crtc[8] & 0x60) >> 5);
if ((svga->crtc[0x67] & 0xc) != 0xc)
svga->ma_latch |= (virge->ma_ext << 16);
} else {
svga->fullchange = changeframecount;
svga_recalctimings(svga);