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[SNES]: Improved cart mode 20 reserved access behaviour

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This commit is contained in:
Angelo Salese 2009-08-19 14:36:15 +00:00
parent 57c0e1690f
commit 395e35face
1 changed files with 6 additions and 2 deletions
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8
src/mame/machine/snes.c
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@ -729,6 +729,8 @@ WRITE8_HANDLER( snes_w_io )
break; break;
default: default:
/* Unknown size so default to 8 & 16 */ /* Unknown size so default to 8 & 16 */
printf( "Object size unsupported: %d\n", (data & 0xe0) >> 5 );
snes_ppu.oam.size[0] = 1; snes_ppu.oam.size[0] = 1;
snes_ppu.oam.size[1] = 2; snes_ppu.oam.size[1] = 2;
#ifdef SNES_DBG_REG_W #ifdef SNES_DBG_REG_W
@ -1451,8 +1453,8 @@ READ8_HANDLER( snes_r_bank3 )
if (snes_cart.mode & 5) /* Mode 20 & 22 */ if (snes_cart.mode & 5) /* Mode 20 & 22 */
{ {
if ((address < 0x8000) && (snes_cart.mode == SNES_MODE_20)) if ((address < 0x8000) && (snes_cart.mode == SNES_MODE_20)) //FIXME: check this
value = 0xff; /* Reserved */ value = snes_ram[0x200000 + ((offset & ~0x8000) | 0x8000)]; /* Reserved */
else else
value = snes_ram[0x400000 + offset]; value = snes_ram[0x400000 + offset];
} }
@ -1549,7 +1551,9 @@ READ8_HANDLER( snes_r_bank7 )
if (snes_cart.mode & 5) /* Mode 20 & 22 */ if (snes_cart.mode & 5) /* Mode 20 & 22 */
{ {
if (address < 0x8000) if (address < 0x8000)
{
value = memory_read_byte(space, 0x400000 + offset); value = memory_read_byte(space, 0x400000 + offset);
}
else else
value = snes_ram[0xc00000 + offset]; value = snes_ram[0xc00000 + offset];
} }