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Add ATI EGA Wonder 800+ emulation.

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This commit is contained in:
SarahW 2019-12-19 11:24:08 +00:00
commit 2489fd9c6e
7 changed files with 140 additions and 3 deletions
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123
src/vid_ati18800.c
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@ -19,6 +19,10 @@ typedef struct ati18800_t
uint8_t regs[256];
int index;
int is_ega;
int ega_switches;
int ega_switch_read;
} ati18800_t;
void ati18800_out(uint16_t addr, uint8_t val, void *p)
@ -56,6 +60,43 @@ void ati18800_out(uint16_t addr, uint8_t val, void *p)
}
break;
case 0x3c2:
if (ati18800->is_ega)
{
if ((val & 0x80) != (svga->miscout & 0x80))
{
int c;
if (val & 0x80)
{
for (c = 0; c < 256; c++)
{
ati18800->svga.pallook[c] = makecol32(((c >> 2) & 1) * 0xaa, ((c >> 1) & 1) * 0xaa, (c & 1) * 0xaa);
ati18800->svga.pallook[c] += makecol32(((c >> 5) & 1) * 0x55, ((c >> 4) & 1) * 0x55, ((c >> 3) & 1) * 0x55);
}
ati18800->svga.vertical_linedbl = 0;
}
else
{
for (c = 0; c < 256; c++)
{
if ((c & 0x17) == 6)
ati18800->svga.pallook[c] = makecol32(0xaa, 0x55, 0x00);
else
{
ati18800->svga.pallook[c] = makecol32(((c >> 2) & 1) * 0xaa, ((c >> 1) & 1) * 0xaa, (c & 1) * 0xaa);
ati18800->svga.pallook[c] += makecol32(((c >> 4) & 1) * 0x55, ((c >> 4) & 1) * 0x55, ((c >> 4) & 1) * 0x55);
}
}
ati18800->svga.vertical_linedbl = 1;
}
svga->fullchange = changeframecount;
}
ati18800->ega_switch_read = val & 0xc;
}
break;
case 0x3D4:
svga->crtcreg = val & 0x3f;
return;
@ -109,6 +150,20 @@ uint8_t ati18800_in(uint16_t addr, void *p)
}
break;
case 0x3c2:
if (ati18800->is_ega)
{
switch (ati18800->ega_switch_read)
{
case 0xc: return (ati18800->ega_switches & 1) ? 0x10 : 0;
case 0x8: return (ati18800->ega_switches & 2) ? 0x10 : 0;
case 0x4: return (ati18800->ega_switches & 4) ? 0x10 : 0;
case 0x0: return (ati18800->ega_switches & 8) ? 0x10 : 0;
}
}
break;
case 0x3D4:
temp = svga->crtcreg;
break;
@ -119,10 +174,25 @@ uint8_t ati18800_in(uint16_t addr, void *p)
temp = svga_in(addr, svga);
break;
}
if (addr != 0x3da) pclog("%02X %04X:%04X\n", temp, CS,cpu_state.pc);
// if (addr != 0x3da) pclog("%02X %04X:%04X\n", temp, CS,cpu_state.pc);
return temp;
}
static void ega_wonder_800_recalctimings(svga_t *svga)
{
ati18800_t *ati18800 = (ati18800_t *)svga->p;
int clksel = ((svga->miscout & 0xc) >> 2) | ((ati18800->regs[0xbe] & 0x10) ? 4 : 0);
switch (clksel)
{
case 0: svga->clock = (cpuclock * (double)(1ull << 32)) / 25175000.0; break;
case 1: svga->clock = (cpuclock * (double)(1ull << 32)) / 28322000.0; break;
case 4: svga->clock = (cpuclock * (double)(1ull << 32)) / 14318181.0; break;
case 5: svga->clock = (cpuclock * (double)(1ull << 32)) / 16257000.0; break;
case 7: default: svga->clock = (cpuclock * (double)(1ull << 32)) / 36000000.0; break;
}
}
void *ati18800_init()
{
ati18800_t *ati18800 = malloc(sizeof(ati18800_t));
@ -146,11 +216,51 @@ void *ati18800_init()
return ati18800;
}
void *ega_wonder_800_init()
{
int c;
ati18800_t *ati18800 = malloc(sizeof(ati18800_t));
memset(ati18800, 0, sizeof(ati18800_t));
rom_init(&ati18800->bios_rom, "ATI EGA Wonder 800+ N1.00.BIN", 0xc0000, 0x8000, 0x7fff, 0, MEM_MAPPING_EXTERNAL);
svga_init(&ati18800->svga, ati18800, 1 << 18, /*256kb*/
ega_wonder_800_recalctimings,
ati18800_in, ati18800_out,
NULL,
NULL);
io_sethandler(0x01ce, 0x0002, ati18800_in, NULL, NULL, ati18800_out, NULL, NULL, ati18800);
io_sethandler(0x03c0, 0x0006, ati18800_in, NULL, NULL, ati18800_out, NULL, NULL, ati18800);
io_sethandler(0x03ca, 0x0016, ati18800_in, NULL, NULL, ati18800_out, NULL, NULL, ati18800);
ati18800->svga.miscout = 1;
for (c = 0; c < 256; c++)
{
ati18800->svga.pallook[c] = makecol32(((c >> 2) & 1) * 0xaa, ((c >> 1) & 1) * 0xaa, (c & 1) * 0xaa);
ati18800->svga.pallook[c] += makecol32(((c >> 5) & 1) * 0x55, ((c >> 4) & 1) * 0x55, ((c >> 3) & 1) * 0x55);
}
ati_eeprom_load(&ati18800->eeprom, "egawonder800.nvr", 0);
ati18800->is_ega = 1;
ati18800->ega_switches = 9;
return ati18800;
}
static int ati18800_available()
{
return rom_present("vgaedge16.vbi");
}
static int ega_wonder_800_available()
{
return rom_present("ATI EGA Wonder 800+ N1.00.BIN");
}
void ati18800_close(void *p)
{
ati18800_t *ati18800 = (ati18800_t *)p;
@ -193,3 +303,14 @@ device_t ati18800_device =
ati18800_add_status_info
};
device_t ati_ega_wonder_800_device =
{
"ATI EGA Wonder 800+",
0,
ega_wonder_800_init,
ati18800_close,
ega_wonder_800_available,
ati18800_speed_changed,
ati18800_force_redraw,
ati18800_add_status_info
};