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Fix CGA Start address and address range

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@1619
This commit is contained in:
Sjoerd van der Berg 2004-01-28 21:00:42 +00:00
parent 028737db18
commit c32e90eabd
1 changed files with 10 additions and 9 deletions
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19
src/hardware/vga_draw.cpp
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@ -44,10 +44,9 @@ static Bit8u * VGA_HERC_Draw_Line(Bitu vidstart,Bitu panning,Bitu line) {
}
static Bit8u * VGA_CGA2_Draw_Line(Bitu vidstart,Bitu panning,Bitu line) {
Bit8u * reader=&vga.mem.linear[vidstart+(line * 8 * 1024)];
Bit32u * draw=(Bit32u *)&VGA_DrawBuffer[0];
line*=8*1024;Bit32u * draw=(Bit32u *)&VGA_DrawBuffer[0];
for (Bitu x=vga.draw.blocks;x>0;x--) {
Bitu val=*reader++;
Bitu val=vga.mem.linear[vidstart+line];vidstart=(vidstart+1)&0x1fff;
*draw++=CGA_2_Table[val >> 4];
*draw++=CGA_2_Table[val & 0xf];
}
@ -55,10 +54,10 @@ static Bit8u * VGA_CGA2_Draw_Line(Bitu vidstart,Bitu panning,Bitu line) {
}
static Bit8u * VGA_CGA4_Draw_Line(Bitu vidstart,Bitu panning,Bitu line) {
Bit8u * reader=&vga.mem.linear[vidstart+(line * 8 * 1024)];
Bit32u * draw=(Bit32u *)&VGA_DrawBuffer[0];
line*=8*1024;Bit32u * draw=(Bit32u *)&VGA_DrawBuffer[0];
for (Bitu x=0;x<vga.draw.blocks;x++) {
*draw++=CGA_4_Table[*reader++];
Bitu val=vga.mem.linear[vidstart+line];vidstart=(vidstart+1)&0x1fff;
*draw++=CGA_4_Table[val];
}
return VGA_DrawBuffer;
}
@ -70,10 +69,9 @@ static Bit8u convert16[16]={
};
static Bit8u * VGA_CGA16_Draw_Line(Bitu vidstart,Bitu panning,Bitu line) {
Bit8u * reader=&vga.mem.linear[vidstart+(line * 8 * 1024)];
Bit32u * draw=(Bit32u *)&VGA_DrawBuffer[0];
line*=8*1024;Bit32u * draw=(Bit32u *)&VGA_DrawBuffer[0];
for (Bitu x=0;x<vga.draw.blocks;x++) {
Bitu val=*reader++;
Bitu val=vga.mem.linear[vidstart+line];vidstart=(vidstart+1)&0x1fff;
Bit32u full=convert16[val >> 4] | convert16[val & 0xf] << 16;
*draw++=full|=full<<8;
}
@ -217,6 +215,9 @@ static void VGA_VerticalTimer(void) {
FontMask[1]=(vga.attr.mode_control & (vga.draw.cursor.count >> 1) & 0x8) ?
0 : 0xffffffff;
break;
case M_CGA4:case M_CGA2:case M_CGA16:
vga.draw.address=(vga.draw.address*2)&0x1fff;
break;
}
if (RENDER_StartUpdate()) {
VGA_DrawPart();