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Added support for Tandy 1000 HX and SL/2. As part of this commit :

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- FDC now selects drive number from DOR (0x3f2)
- FDC now fails seeks on drives > 1
- XT systems no longer have BIOS mapping at E0000-EFFFF
- SN76489 now distinguishes between SN76496 (PCjr and early Tandy 1000), NCR8496 (later Tandy 1000 - different noise handling) and PSSJ
- Removed redundant limits on memory configuration - allows selection of 768k for Tandy 1000 SL/2
This commit is contained in:
TomW 2015-12-03 21:48:10 +00:00
commit 2ca86ba028
24 changed files with 1420 additions and 64 deletions
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9
src/vid_tandy.c
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@ -26,6 +26,7 @@ typedef struct tandy_t
uint8_t stat;
uint8_t *vram, *b8000;
uint32_t b8000_mask;
int linepos, displine;
int sc, vc;
@ -116,12 +117,14 @@ void tandy_recalcaddress(tandy_t *tandy)
{
tandy->vram = &ram[((tandy->memctrl & 0x06) << 14) + tandy->base];
tandy->b8000 = &ram[((tandy->memctrl & 0x30) << 11) + tandy->base];
tandy->b8000_mask = 0x7fff;
// printf("VRAM at %05X B8000 at %05X\n",((tandy->memctrl&0x6)<<14)+tandy->base,((tandy->memctrl&0x30)<<11)+tandy->base);
}
else
{
tandy->vram = &ram[((tandy->memctrl & 0x07) << 14) + tandy->base];
tandy->b8000 = &ram[((tandy->memctrl & 0x38) << 11) + tandy->base];
tandy->b8000_mask = 0x3fff;
// printf("VRAM at %05X B8000 at %05X\n",((tandy->memctrl&0x7)<<14)+tandy->base,((tandy->memctrl&0x38)<<11)+tandy->base);
}
}
@ -148,7 +151,7 @@ void tandy_write(uint32_t addr, uint8_t val, void *p)
egawrites++;
// pclog("Tandy VRAM write %05X %02X %04X:%04X %04X:%04X\n",addr,val,CS,pc,DS,SI);
tandy->b8000[addr & 0x7fff] = val;
tandy->b8000[addr & tandy->b8000_mask] = val;
}
uint8_t tandy_read(uint32_t addr, void *p)
@ -159,7 +162,7 @@ uint8_t tandy_read(uint32_t addr, void *p)
egareads++;
// pclog("Tandy VRAM read %05X %02X %04X:%04X\n",addr,tandy->b8000[addr&0x7FFF],CS,pc);
return tandy->b8000[addr & 0x7fff];
return tandy->b8000[addr & tandy->b8000_mask];
}
void tandy_recalctimings(tandy_t *tandy)
@ -689,6 +692,8 @@ void *tandy_init()
mem_mapping_set_addr(&ram_low_mapping, 0, (mem_size - 128) * 1024);
io_sethandler(0x03d0, 0x0010, tandy_in, NULL, NULL, tandy_out, NULL, NULL, tandy);
io_sethandler(0x00a0, 0x0001, tandy_in, NULL, NULL, tandy_out, NULL, NULL, tandy);
tandy->b8000_mask = 0x3fff;
return tandy;
}