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SNES updates: [R. Belmont, Harmony]

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- Corrected ROM loading behavior for SuperFX games
- Added more ROM mirroring needed by certain SuperFX 2 games
- Corrected the behavior of certain bit-restricted SuperFX registers.  Doom, Yoshi's Island, Dirt Trax FX and Voxel Demo show things now.
- Improved S-DD1 emulation, neither game using S-DD1 boots yet
This commit is contained in:
Ryan Holtz 2009-09-04 05:00:05 +00:00
parent 7e1e776505
commit faf695bfc9
2 changed files with 19 additions and 11 deletions
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16
src/emu/cpu/superfx/superfx.c
View File

@ -530,6 +530,8 @@ void superfx_mmio_write(const device_config *cpu, UINT32 addr, UINT8 data)
addr &= 0xffff;
//printf( "superfx_mmio_write: %08x = %02x\n", addr, data );
if(addr >= 0x3100 && addr <= 0x32ff)
{
return superfx_cache_mmio_write(cpustate, addr - 0x3100, data);
@ -573,11 +575,11 @@ void superfx_mmio_write(const device_config *cpu, UINT32 addr, UINT8 data)
break;
case 0x3033:
cpustate->bramr = data;
cpustate->bramr = data & 1;
break;
case 0x3034:
cpustate->pbr = data;
cpustate->pbr = data & 0x7f;
superfx_cache_flush(cpustate);
break;
@ -591,7 +593,7 @@ void superfx_mmio_write(const device_config *cpu, UINT32 addr, UINT8 data)
break;
case 0x3039:
cpustate->clsr = data;
cpustate->clsr = data & 1;
superfx_update_speed(cpustate);
break;
@ -1169,7 +1171,7 @@ static CPU_EXECUTE( superfx )
{ // DIV2
cpustate->sfr &= ~SUPERFX_SFR_CY;
cpustate->sfr |= (*(cpustate->sreg) & 1) ? SUPERFX_SFR_CY : 0;
superfx_gpr_write(cpustate, cpustate->dreg_idx, ((INT16)(*(cpustate->sreg)) >> 1) + ((*(cpustate->sreg) + 1) >> 16));
superfx_gpr_write(cpustate, cpustate->dreg_idx, ((INT16)(*(cpustate->sreg)) >> 1) + ((UINT32)(*(cpustate->sreg) + 1) >> 16));
superfx_dreg_sfr_sz_update(cpustate);
superfx_regs_reset(cpustate);
}
@ -1194,7 +1196,7 @@ static CPU_EXECUTE( superfx )
}
else
{ // LJMP
cpustate->pbr = cpustate->r[op & 0xf];
cpustate->pbr = cpustate->r[op & 0xf] & 0x7f;
superfx_gpr_write(cpustate, 15, *(cpustate->sreg));
cpustate->cbr = cpustate->r[15] & 0xfff0;
superfx_cache_flush(cpustate);
@ -1319,12 +1321,12 @@ static CPU_EXECUTE( superfx )
break;
case SUPERFX_SFR_ALT2: // RAMB
superfx_rambuffer_sync(cpustate);
cpustate->rambr = *(cpustate->sreg);
cpustate->rambr = ((*(cpustate->sreg)) & 1) ? 1 : 0;
superfx_regs_reset(cpustate);
break;
case SUPERFX_SFR_ALT3: // ROMB
superfx_rombuffer_sync(cpustate);
cpustate->rombr = *(cpustate->sreg);
cpustate->rombr = *(cpustate->sreg) & 0x7f;
superfx_regs_reset(cpustate);
break;
}

14
src/mame/machine/snes.c
View File

@ -1354,8 +1354,6 @@ WRITE8_HANDLER( snes_w_io )
break;
}
logerror("Unsupported MMIO write: offset %08x = %02x\n", offset, data);
snes_ram[offset] = data;
}
@ -1520,7 +1518,12 @@ READ8_HANDLER( snes_r_bank3 )
UINT8 value;
UINT16 address = offset & 0xffff;
if (snes_cart.mode & 5) /* Mode 20 & 22 */
if (snes_has_addon_chip == HAS_SUPERFX)
{
//printf( "snes_r_bank3: %08x\n", offset );
return snes_ram[0x400000 + offset];
}
else if (snes_cart.mode & 5) /* Mode 20 & 22 */
{
if ((address < 0x8000) && (snes_cart.mode == SNES_MODE_20)) //FIXME: check this
value = snes_ram[0x200000 + ((offset & ~0x8000) | 0x8000)]; /* Reserved */
@ -1669,7 +1672,9 @@ WRITE8_HANDLER( snes_w_bank1 )
snes_w_io(space, address, data);
else if (address < 0x8000)
{
if (snes_has_addon_chip == HAS_OBC1)
if (snes_has_addon_chip == HAS_SUPERFX)
snes_ram[0x700000 + (address & 0x1fff)] = data;
else if (snes_has_addon_chip == HAS_OBC1)
obc1_write(space, offset, data);
else if ((snes_has_addon_chip == HAS_DSP2) && (offset >= 0x200000))
DSP2_write(data);
@ -2478,5 +2483,6 @@ WRITE8_HANDLER( superfx_w_bank2 )
WRITE8_HANDLER( superfx_w_bank3 )
{
//printf( "superfx_w_bank3: %08x = %02x\n", 0x600000 + offset, data );
snes_ram[0x600000 + offset] = data;
}