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Mach64 now disables VGA data processing on LFB writes. Windows 9x DOS boxes now rendered correctly.

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This commit is contained in:
TomW 2013-12-15 14:29:52 +00:00
commit 74793aaf99
3 changed files with 11 additions and 5 deletions
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8
src/vid_svga.c
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@ -660,7 +660,7 @@ void svga_write(uint32_t addr, uint8_t val, void *p)
addr += svga->write_bank;
if (!(svga->gdcreg[6] & 1)) svga->fullchange=2;
if (svga->chain4)
if (svga->chain4 || svga->fb_only)
{
writemask2=1<<(addr&3);
addr&=~3;
@ -836,7 +836,7 @@ uint8_t svga_read(uint32_t addr, void *p)
// pclog("%05X %i %04X:%04X %02X %02X %i\n",addr,svga->chain4,CS,pc, vram[addr & 0x7fffff], vram[(addr << 2) & 0x7fffff], svga->readmode);
// pclog("%i\n", svga->readmode);
if (svga->chain4)
if (svga->chain4 || svga->fb_only)
{
addr &= 0x7fffff;
if (addr >= svga->vram_limit)
@ -888,7 +888,7 @@ void svga_write_linear(uint32_t addr, uint8_t val, void *p)
if (svga_output) pclog("Write LFB %08X %02X ", addr, val);
if (!(svga->gdcreg[6] & 1))
svga->fullchange = 2;
if (svga->chain4)
if (svga->chain4 || svga->fb_only)
{
writemask2=1<<(addr&3);
addr&=~3;
@ -1057,7 +1057,7 @@ uint8_t svga_read_linear(uint32_t addr, void *p)
egareads++;
if (svga->chain4)
if (svga->chain4 || svga->fb_only)
{
addr &= 0x7fffff;
if (addr >= svga->vram_limit)