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NESHawk - fix mapper 164

This commit is contained in:
adelikat 2015-08-25 20:11:32 -04:00
parent d91c7a26df
commit defdfa6e2e
1 changed files with 22 additions and 16 deletions
BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards
Mapper164.cs

38
BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper164.cs
View File

@ -6,8 +6,10 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
{
// http://wiki.nesdev.com/w/index.php/INES_Mapper_164
int prg_bank;
int prg_bank_mask_32k;
private int _prgHigh;
private int _prgLow;
private int prg_bank_mask_32k;
public override bool Configure(NES.EDetectionOrigin origin)
{
@ -18,7 +20,8 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
default:
return false;
}
prg_bank = 0xFF;
_prgLow = 0xFF;
prg_bank_mask_32k = Cart.prg_size / 32 - 1;
SetMirrorType(Cart.pad_h, Cart.pad_v);
return true;
@ -26,32 +29,35 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
public override void WriteEXP(int addr, byte value)
{
addr = (addr + 0x4000) & 0xF300;
if (addr == 0x5000 || addr == 0xD000)
prg_bank = value;
}
public override void WritePRG(int addr, byte value)
{
addr = (addr + 0x8000) & 0xF300;
if (addr == 0x5000 || addr == 0xD000)
prg_bank = value;
addr = (addr + 0x4000) & 0x7300;
switch (addr)
{
case 0x5000:
_prgLow = value;
break;
case 0x5100:
_prgHigh = value;
break;
}
}
public override byte ReadPRG(int addr)
{
return ROM[addr + ((prg_bank & prg_bank_mask_32k) * 0x8000)];
int bank = (_prgHigh << 4) | (_prgLow & 0xF);
bank &= prg_bank_mask_32k;
return ROM[(bank * 0x8000) + (addr & 0x7FFF)];
}
public override void SyncState(Serializer ser)
{
base.SyncState(ser);
ser.Sync("prg", ref prg_bank);
ser.Sync("prgHigh", ref _prgHigh);
ser.Sync("prgLow", ref _prgLow);
}
public override void NESSoftReset()
{
prg_bank = 0xFF;
_prgHigh = 0xFF;
base.NESSoftReset();
}
}