ShuriZma
/
BizHawk
mirror of https://github.com/TASEmulators/BizHawk.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Fix Mapper 121

This commit is contained in:
alyosha-tas 2016-09-24 21:02:55 -04:00 committed by GitHub
parent 1d479559c7
commit 2bdd0c44cb
1 changed files with 32 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

62
BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/MMC3_family/Mapper121.cs
View File

@ -7,7 +7,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
{
private ByteBuffer exRegs = new ByteBuffer(3);
private readonly byte[] lut = { 0x83, 0x83, 0x42, 0x00 };
private readonly byte[] lut = { 0x00, 0x83, 0x42, 0x00 };
public override bool Configure(NES.EDetectionOrigin origin)
{
@ -39,34 +39,36 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
{
return base.ReadEXP(addr);
}
}
protected override int Get_PRGBank_8K(int addr)
{
if (addr == 0x4000 && exRegs[0] > 0)
{
return exRegs[0] & prg_mask;
}
else if (addr == 0x6000 && exRegs[1] > 0)
{
return exRegs[1] & prg_mask;
}
else
{
return base.Get_PRGBank_8K(addr);
}
}
}
public override void WriteEXP(int addr, byte value)
{
if (addr >= 0x1000) // 0x5000-0x5FFF
if (addr >= 0x1000) // 0x5000-0x5FFF
{
exRegs[2] = lut[value & 0x3];
}
}
public override byte ReadPRG(int addr)
{
int bank_8k = addr >> 13;
if (bank_8k == 2 && exRegs[0] > 0)
{
bank_8k = exRegs[0] & prg_mask;
}
else if (bank_8k == 3 && exRegs[1] > 0)
{
bank_8k = exRegs[1] & prg_mask;
}
else
bank_8k = base.Get_PRGBank_8K(addr);
bank_8k &= prg_mask;
addr = (bank_8k << 13) | (addr & 0x1FFF);
return ROM[addr];
}
public override void WritePRG(int addr, byte value)
{
if (addr < 0x2000)
@ -88,15 +90,15 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
default: exRegs[0] = 0x0; exRegs[1] = 0x0; break;
}
}
//else
//{
// base.WritePRG(addr, value);
//}
else if ((addr & 1)>0)
base.WritePRG(addr, value);
else //if (addr==0)
base.WritePRG(0, value);
}
else
{
base.WritePRG(addr, value);
}
//else
//{
// base.WritePRG(addr, value);
//}
}
}
}