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This commit is contained in:
Angelo Salese 2012-02-02 20:00:41 +00:00
parent 63e6f91b2b
commit cf109f9198
1 changed files with 11 additions and 2 deletions
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13
src/emu/video/pc_vga.c
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@ -1827,6 +1827,10 @@ static UINT8 trident_seq_reg_read(running_machine &machine, UINT8 index)
{ {
switch(index) switch(index)
{ {
case 0x0b:
res = svga.id;
// TODO: new mode registers selected
break;
case 0x0d: case 0x0d:
res = svga.rgb15_en; res = svga.rgb15_en;
break; break;
@ -1848,6 +1852,9 @@ static void trident_seq_reg_write(running_machine &machine, UINT8 index, UINT8 d
{ {
switch(index) switch(index)
{ {
case 0x0b:
// TODO: old mode registers selected
break;
case 0x0d: case 0x0d:
svga.rgb15_en = data & 0x30; // TODO: doesn't match documentation svga.rgb15_en = data & 0x30; // TODO: doesn't match documentation
break; break;
@ -1928,7 +1935,8 @@ READ8_HANDLER( trident_mem_r )
if (svga.rgb15_en & 0x30) if (svga.rgb15_en & 0x30)
{ {
int data; int data;
if(svga.bank_w>0x09) return 0; if(offset & 0x10000) // TODO: old reg mode actually CAN read to the upper bank
return 0;
data=vga.memory[offset + (svga.bank_w*0x10000)]; data=vga.memory[offset + (svga.bank_w*0x10000)];
return data; return data;
} }
@ -1940,7 +1948,8 @@ WRITE8_HANDLER( trident_mem_w )
{ {
if (svga.rgb15_en & 0x30) if (svga.rgb15_en & 0x30)
{ {
if (svga.bank_w>0x09)return; if(offset & 0x10000) // TODO: old reg mode actually CAN write to the upper bank
return;
vga.memory[offset + (svga.bank_w*0x10000)]= data; vga.memory[offset + (svga.bank_w*0x10000)]= data;
return; return;
} }