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clgd542x: fixed background and foreground colours in XFree86, which does not enable extended writes that the manuals say enable the extra bits in GR0/GR1.

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This commit is contained in:
mahlemiut 2015-05-23 14:19:37 +12:00
parent a5190fd218
commit 9d1505cd9d
1 changed files with 6 additions and 12 deletions
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18
src/emu/video/clgd542x.c
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@ -620,13 +620,13 @@ UINT8 cirrus_gd5428_device::cirrus_gc_reg_read(UINT8 index)
switch(index) switch(index)
{ {
case 0x00: case 0x00:
if(gc_mode_ext & 0x02) if(gc_mode_ext & 0x04)
res = vga.gc.set_reset & 0xff; res = vga.gc.set_reset & 0xff;
else else
res = vga.gc.set_reset & 0x0f; res = vga.gc.set_reset & 0x0f;
break; break;
case 0x01: case 0x01:
if(gc_mode_ext & 0x02) if(gc_mode_ext & 0x04)
res = vga.gc.enable_set_reset & 0xff; res = vga.gc.enable_set_reset & 0xff;
else else
res = vga.gc.enable_set_reset & 0x0f; res = vga.gc.enable_set_reset & 0x0f;
@ -738,17 +738,11 @@ void cirrus_gd5428_device::cirrus_gc_reg_write(UINT8 index, UINT8 data)
if(LOG_REG) logerror("CL: GC write %02x to GR%02x\n",data,index); if(LOG_REG) logerror("CL: GC write %02x to GR%02x\n",data,index);
switch(index) switch(index)
{ {
case 0x00: // if extended writes are enabled (bit 2 of index 0bh), then index 0 and 1 are extended to 8 bits case 0x00: // if extended writes are enabled (bit 2 of index 0bh), then index 0 and 1 are extended to 8 bits, however XFree86 does not appear to do this...
if(gc_mode_ext & 0x04) vga.gc.set_reset = data & 0xff;
vga.gc.set_reset = data & 0xff;
else
vga.gc.set_reset = data & 0x0f;
break; break;
case 0x01: case 0x01:
if(gc_mode_ext & 0x04) vga.gc.enable_set_reset = data & 0xff;
vga.gc.enable_set_reset = data & 0xff;
else
vga.gc.enable_set_reset = data & 0x0f;
break; break;
case 0x05: case 0x05:
vga.gc.shift256 = (data & 0x40) >> 6; vga.gc.shift256 = (data & 0x40) >> 6;
@ -770,7 +764,7 @@ void cirrus_gd5428_device::cirrus_gc_reg_write(UINT8 index, UINT8 data)
break; break;
case 0x0b: // Graphics controller mode extensions case 0x0b: // Graphics controller mode extensions
gc_mode_ext = data; gc_mode_ext = data;
if(!(data & 0x02)) if(!(data & 0x04))
{ {
vga.gc.set_reset &= 0x0f; vga.gc.set_reset &= 0x0f;
vga.gc.enable_set_reset &= 0x0f; vga.gc.enable_set_reset &= 0x0f;