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NESHawk - attempt to implement mapper 51, but it is busted

This commit is contained in:
adelikat 2015-08-09 11:11:40 -04:00
parent 66c2d48e8d
commit d9fc4f9cd0
2 changed files with 113 additions and 0 deletions
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1
BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
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@ -518,6 +518,7 @@
<Compile Include="Consoles\Nintendo\NES\Boards\Mapper041.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\Mapper042.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\Mapper045.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\Mapper051.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\Mapper057.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\Mapper058.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\Mapper069.cs" />

112
BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper051.cs Normal file
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@ -0,0 +1,112 @@
using BizHawk.Common;
namespace BizHawk.Emulation.Cores.Nintendo.NES
{
public sealed class Mapper051 : NES.NESBoardBase
{
private int _bank;
private int _mode = 2;
public override bool Configure(NES.EDetectionOrigin origin)
{
switch (Cart.board_type)
{
case "MAPPER051":
break;
default:
return false;
}
SetMirrorType(Cart.pad_h, Cart.pad_v);
return true;
}
public override void NESSoftReset()
{
_bank = 0;
_mode = 2;
base.NESSoftReset();
}
public override void SyncState(Serializer ser)
{
base.SyncState(ser);
ser.Sync("bank", ref _bank);
ser.Sync("mode", ref _mode);
}
public override byte ReadPPU(int addr)
{
int prgBank8k;
if ((_mode & 0x02) > 0)
{
prgBank8k = ((_bank & 7) << 2) | 0x23;
}
else
{
prgBank8k = ((_bank & 4) << 2) | 0x2F;
}
return ROM[(prgBank8k * 0x2000) + addr];
}
public override byte ReadPRG(int addr)
{
int prgBank16k_8;
int prgBank16k_C;
int prgBank;
if ((_mode & 0x02) > 0)
{
prgBank16k_8 = (_bank << 1) | 0;
prgBank16k_C = (_bank << 1) | 1;
prgBank = _bank << 1;
}
else
{
prgBank16k_8 = (_bank << 1) | (_mode >> 4);
prgBank16k_C = ((_bank & 0xC) << 1) | 7;
}
if (addr < 0x4000)
{
return ROM[(prgBank16k_8 * 0x4000) + (addr & 0x3FFF)];
}
else
{
return ROM[(prgBank16k_C * 0x4000) + (addr & 0x3FFF)];
}
}
public override void WritePPU(int addr, byte value)
{
_mode = value & 0x012;
SyncMirroring();
}
public override void WritePRG(int addr, byte value)
{
_bank = value & 0x0F;
if ((addr & 0x4000) > 0)
{
_mode = (_mode & 0x02) | (value & 0x10);
}
SyncMirroring();
}
private void SyncMirroring()
{
if (_mode == 0x12)
{
SetMirrorType(EMirrorType.Horizontal);
}
else
{
SetMirrorType(EMirrorType.Vertical);
}
}
}
}