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Fixed reading in read mode 1, might fix Street Games? nw

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This commit is contained in:
Angelo Salese 2012-02-02 01:16:30 +00:00
parent 976fbef835
commit 44179c4a50
1 changed files with 56 additions and 11 deletions
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67
src/emu/video/pc_vga.c
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@ -128,6 +128,11 @@ static struct
UINT8 index;
UINT8 *data;
UINT8 latch[4];
UINT8 color_compare;
UINT8 read_map_sel;
UINT8 read_mode;
UINT8 write_mode;
UINT8 color_dont_care;
} gc;
struct
@ -1135,6 +1140,26 @@ static void attribute_reg_write(UINT8 index, UINT8 data)
}
}
static void gc_reg_write(running_machine &machine,UINT8 index,UINT8 data)
{
switch(index)
{
case 0x02:
vga.gc.color_compare = data & 0xf;
break;
case 0x04:
vga.gc.read_map_sel = data & 3;
break;
case 0x05:
vga.gc.read_mode = (data & 8) >> 3;
vga.gc.write_mode = data & 3;
break;
case 0x07:
vga.gc.color_dont_care = data & 0xf;
break;
}
}
WRITE8_HANDLER(vga_port_03c0_w)
{
if (LOG_ACCESSES)
@ -1226,6 +1251,8 @@ WRITE8_HANDLER(vga_port_03c0_w)
{
vga.gc.data[vga.gc.index] = data;
}
gc_reg_write(space->machine(),vga.gc.index,data);
break;
}
}
@ -1288,19 +1315,37 @@ READ8_HANDLER(vga_mem_r)
vga.gc.latch[2]=vga.memory[(offset)+0x40000];
vga.gc.latch[3]=vga.memory[(offset)+0x60000];
if (vga.gc.data[5]&8) {
if (vga.gc.read_mode)
{
UINT8 byte,layer;
UINT8 fill_latch;
data=0;
if (!(ega_bitplane_to_packed(vga.gc.latch, 0)^(vga.gc.data[2]&0xf&~vga.gc.data[7]))) data|=1;
if (!(ega_bitplane_to_packed(vga.gc.latch, 1)^(vga.gc.data[2]&0xf&~vga.gc.data[7]))) data|=2;
if (!(ega_bitplane_to_packed(vga.gc.latch, 2)^(vga.gc.data[2]&0xf&~vga.gc.data[7]))) data|=4;
if (!(ega_bitplane_to_packed(vga.gc.latch, 3)^(vga.gc.data[2]&0xf&~vga.gc.data[7]))) data|=8;
if (!(ega_bitplane_to_packed(vga.gc.latch, 4)^(vga.gc.data[2]&0xf&~vga.gc.data[7]))) data|=0x10;
if (!(ega_bitplane_to_packed(vga.gc.latch, 5)^(vga.gc.data[2]&0xf&~vga.gc.data[7]))) data|=0x20;
if (!(ega_bitplane_to_packed(vga.gc.latch, 6)^(vga.gc.data[2]&0xf&~vga.gc.data[7]))) data|=0x40;
if (!(ega_bitplane_to_packed(vga.gc.latch, 7)^(vga.gc.data[2]&0xf&~vga.gc.data[7]))) data|=0x80;
} else {
data=vga.gc.latch[vga.gc.data[4]&3];
#if 0
if (!(ega_bitplane_to_packed(vga.gc.latch, 0)^(vga.gc.color_compare&vga.gc.color_dont_care))) data|=1;
if (!(ega_bitplane_to_packed(vga.gc.latch, 1)^(vga.gc.color_compare&vga.gc.color_dont_care))) data|=2;
if (!(ega_bitplane_to_packed(vga.gc.latch, 2)^(vga.gc.color_compare&vga.gc.color_dont_care))) data|=4;
if (!(ega_bitplane_to_packed(vga.gc.latch, 3)^(vga.gc.color_compare&vga.gc.color_dont_care))) data|=8;
if (!(ega_bitplane_to_packed(vga.gc.latch, 4)^(vga.gc.color_compare&vga.gc.color_dont_care))) data|=0x10;
if (!(ega_bitplane_to_packed(vga.gc.latch, 5)^(vga.gc.color_compare&vga.gc.color_dont_care))) data|=0x20;
if (!(ega_bitplane_to_packed(vga.gc.latch, 6)^(vga.gc.color_compare&vga.gc.color_dont_care))) data|=0x40;
if (!(ega_bitplane_to_packed(vga.gc.latch, 7)^(vga.gc.color_compare&vga.gc.color_dont_care))) data|=0x80;
#endif
for(byte=0;byte<8;byte++)
{
fill_latch = 0;
for(layer=0;layer<4;layer++)
{
if(vga.gc.latch[layer] & 1 << byte)
fill_latch |= 1 << layer;
}
fill_latch &= vga.gc.color_dont_care;
if(fill_latch == vga.gc.color_compare)
data |= 1 << byte;
}
}
else
data=vga.gc.latch[vga.gc.read_map_sel];
return data;
}