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NesHawk - add masking to mapper 212

This commit is contained in:
adelikat 2016-10-30 08:58:12 -05:00
parent eb292026cc
commit d3c8d201fb
1 changed files with 8 additions and 0 deletions
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8
BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper212.cs
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@ -10,6 +10,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
public class Mapper212 : NES.NESBoardBase
{
private int _reg;
private int prg_bank_mask_32k, prg_bank_mask_16k, chr_bank_mask_8k;
public override bool Configure(NES.EDetectionOrigin origin)
{
@ -23,6 +24,10 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
SetMirrorType(Cart.pad_h, Cart.pad_v);
chr_bank_mask_8k = Cart.chr_size / 8 - 1;
prg_bank_mask_16k = Cart.prg_size / 16 - 1;
prg_bank_mask_32k = Cart.prg_size / 32 - 1;
_reg = 65535;
return true;
@ -50,11 +55,13 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
if ((_reg & 0x4000) > 0)
{
int bank = (_reg >> 1) & 3;
bank &= prg_bank_mask_32k;
ret = ROM[(bank * 0x8000) + (addr & 0x7FFF)];
}
else
{
int bank = _reg & 7;
bank &= prg_bank_mask_16k;
ret = ROM[(bank * 0x4000) + (addr & 0x3FFF)];
}
@ -71,6 +78,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
if (addr < 0x2000)
{
int bank = _reg & 7;
bank &= chr_bank_mask_8k;
return VROM[(bank * 0x2000) + (addr & 0x1FFF)];
}