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nes-fix mapper 231

This commit is contained in:
zeromus 2012-07-17 06:24:36 +00:00
parent 309d6b4e64
commit 5eaf27e510
1 changed files with 10 additions and 8 deletions
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18
BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper231.cs
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@ -40,7 +40,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
| $8000 AND $1E | $8000 |
+---------------+---------------+
*/
public int reg;
public int prg_reg;
public bool low;
public int prg_bank_mask_16k;
@ -60,8 +60,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
public override void SyncState(Serializer ser)
{
ser.Sync("reg", ref reg);
ser.Sync("low", ref low);
ser.Sync("prg_reg", ref prg_reg);
base.SyncState(ser);
}
@ -76,20 +75,23 @@ namespace BizHawk.Emulation.Consoles.Nintendo
SetMirrorType(EMirrorType.Vertical);
}
low = addr.Bit(5);
reg = addr & 0x1E;
int prg_reg_P = (addr >> 1) & 0xF;
int prg_reg_L = (addr >> 5) & 1;
prg_reg = (prg_reg_P<<1) | prg_reg_L;
prg_reg &= prg_bank_mask_16k;
}
public override byte ReadPRG(int addr)
{
if (low)
{
int bank = ((reg >> 1) & 0x0F) & (prg_bank_mask_16k >> 1);
return ROM[(bank * 0x8000) + addr];
int bank = prg_reg & 0x1E;
return ROM[(bank * 0x4000) + addr];
}
else
{
return ROM[((reg & prg_bank_mask_16k) * 0x4000) + addr];
int bank = prg_reg;
return ROM[(bank * 0x4000) + addr - 0x4000];
}
}