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Merge pull request #2982 from Cacodemon345/patch-114

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cl54xx: clear only FLAG_EXT_WRITE and FLAG_ADDR_BY16
This commit is contained in:
Miran Grča
2022-12-21 16:23:43 +01:00
committed by GitHub
parent 0cca454ea0 d4ed4a57df
commit 4bb036766c
1 changed files with 13 additions and 9 deletions
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14
src/video/vid_cl54xx.c
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@@ -876,8 +876,6 @@ gd54xx_out(uint16_t addr, uint8_t val, void *p)
svga_recalctimings(svga);
} else {
switch (svga->gdcaddr) {
case 0x09:
case 0x0a:
case 0x0b:
svga->adv_flags = 0;
if (svga->gdcreg[0xb] & 0x01)
@@ -888,20 +886,24 @@ gd54xx_out(uint16_t addr, uint8_t val, void *p)
svga->adv_flags |= FLAG_EXT_WRITE;
if (svga->gdcreg[0xb] & 0x08)
svga->adv_flags |= FLAG_LATCH8;
if (svga->gdcreg[0xb] & 0x10)
if ((svga->gdcreg[0xb] & 0x10) && (svga->adv_flags & FLAG_EXT_WRITE))
svga->adv_flags |= FLAG_ADDR_BY16;
if (svga->gdcreg[0xb] & 0x04)
svga->writemode = svga->gdcreg[5] & 7;
else {
else if (o & 0x4) {
svga->gdcreg[5] &= ~0x04;
svga->writemode = svga->gdcreg[5] & 3;
svga->adv_flags = 0;
svga->adv_flags &= (FLAG_EXTRA_BANKS | FLAG_ADDR_BY8 | FLAG_LATCH8);
if (svga->crtc[0x27] != CIRRUS_ID_CLGD5436) {
svga->gdcreg[0] &= 0x0f;
gd543x_mmio_write(0xb8000, svga->gdcreg[0], gd54xx);
svga->gdcreg[1] &= 0x0f;
gd543x_mmio_write(0xb8004, svga->gdcreg[1], gd54xx);
}
svga->seqregs[2] &= 0x0f;
}
case 0x09:
case 0x0a:
gd54xx_recalc_banking(gd54xx);
break;
@@ -1029,6 +1031,8 @@ gd54xx_out(uint16_t addr, uint8_t val, void *p)
case 0x3d5:
if (((svga->crtcreg == 0x19) || (svga->crtcreg == 0x1a) || (svga->crtcreg == 0x1b) || (svga->crtcreg == 0x1d) || (svga->crtcreg == 0x25) || (svga->crtcreg == 0x27)) && !gd54xx->unlocked)
return;
if ((svga->crtcreg == 0x25) || (svga->crtcreg == 0x27))
return;
if ((svga->crtcreg < 7) && (svga->crtc[0x11] & 0x80))
return;
if ((svga->crtcreg == 7) && (svga->crtc[0x11] & 0x80))