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Changed registers used for EGA/VGA odd/even mode.

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This commit is contained in:
TomW 2015-08-14 21:54:42 +01:00
commit 3789398ca6
4 changed files with 16 additions and 9 deletions
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12
src/vid_svga.c
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@ -111,6 +111,7 @@ void svga_out(uint16_t addr, uint8_t val, void *p)
svga->charsetb += 0x8000;
break;
case 4:
svga->chain2_write = !(val & 4);
svga->chain4 = val & 8;
svga->fast = (svga->gdcreg[8] == 0xff && !(svga->gdcreg[3] & 0x18) && !svga->gdcreg[1]) && svga->chain4;
break;
@ -159,10 +160,13 @@ void svga_out(uint16_t addr, uint8_t val, void *p)
{
case 2: svga->colourcompare=val; break;
case 4: svga->readplane=val&3; break;
case 5: svga->writemode=val&3; svga->readmode=val&8; break;
case 5:
svga->writemode = val & 3;
svga->readmode = val & 8;
svga->chain2_read = val & 0x10;
break;
case 6:
// pclog("svga_out recalcmapping %p\n", svga);
svga->chain2 = val & 2;
if ((svga->gdcreg[6] & 0xc) != (val & 0xc))
{
// pclog("Write mapping %02X\n", val);
@ -741,7 +745,7 @@ void svga_write(uint32_t addr, uint8_t val, void *p)
writemask2=1<<(addr&3);
addr&=~3;
}
else if (svga->chain2)
else if (svga->chain2_write)
{
writemask2 &= ~0xa;
if (addr & 1)
@ -928,7 +932,7 @@ uint8_t svga_read(uint32_t addr, void *p)
return 0xff;
return svga->vram[addr];
}
else if (svga->chain2)
else if (svga->chain2_read)
{
readplane = (readplane & 2) | (addr & 1);
addr &= ~1;