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Fixed text mode in Paradise VGAs (Amstrad systems).

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This commit is contained in:
TomW 2015-08-20 20:56:28 +01:00
commit 969d5811e5
1 changed files with 18 additions and 2 deletions
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20
src/vid_svga.c
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@ -989,6 +989,14 @@ void svga_write_linear(uint32_t addr, uint8_t val, void *p)
writemask2=1<<(addr&3); writemask2=1<<(addr&3);
addr&=~3; addr&=~3;
} }
else if (svga->chain2_write)
{
writemask2 &= ~0xa;
if (addr & 1)
writemask2 <<= 1;
addr &= ~1;
addr <<= 2;
}
else else
{ {
addr<<=2; addr<<=2;
@ -1147,6 +1155,7 @@ uint8_t svga_read_linear(uint32_t addr, void *p)
{ {
svga_t *svga = (svga_t *)p; svga_t *svga = (svga_t *)p;
uint8_t temp, temp2, temp3, temp4; uint8_t temp, temp2, temp3, temp4;
int readplane = svga->readplane;
cycles -= video_timing_b; cycles -= video_timing_b;
cycles_lost += video_timing_b; cycles_lost += video_timing_b;
@ -1160,7 +1169,14 @@ uint8_t svga_read_linear(uint32_t addr, void *p)
return 0xff; return 0xff;
return svga->vram[addr & 0x7fffff]; return svga->vram[addr & 0x7fffff];
} }
else addr<<=2; else if (svga->chain2_read)
{
readplane = (readplane & 2) | (addr & 1);
addr &= ~1;
addr <<= 2;
}
else
addr<<=2;
addr &= 0x7fffff; addr &= 0x7fffff;
@ -1188,7 +1204,7 @@ uint8_t svga_read_linear(uint32_t addr, void *p)
return ~(temp | temp2 | temp3 | temp4); return ~(temp | temp2 | temp3 | temp4);
} }
//printf("Read %02X %04X %04X\n",vram[addr|svga->readplane],addr,svga->readplane); //printf("Read %02X %04X %04X\n",vram[addr|svga->readplane],addr,svga->readplane);
return svga->vram[addr | svga->readplane]; return svga->vram[addr | readplane];
} }
void svga_doblit(int y1, int y2, int wx, int wy, svga_t *svga) void svga_doblit(int y1, int y2, int wx, int wy, svga_t *svga)