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NESHawk - implement mapper 150

This commit is contained in:
adelikat 2016-09-10 23:41:11 -04:00
parent 2c431e75b2
commit a99598b3cf
2 changed files with 135 additions and 0 deletions
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1
BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
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@ -617,6 +617,7 @@
<Compile Include="Consoles\Nintendo\NES\Boards\Mapper136.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\Mapper143.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\Mapper147.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\Mapper150.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\Mapper156.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\Mapper164.cs" />
<Compile Include="Consoles\Nintendo\NES\Boards\Mapper168.cs" />

134
BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper150.cs Normal file
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@ -0,0 +1,134 @@
using BizHawk.Common;
namespace BizHawk.Emulation.Cores.Nintendo.NES
{
// basic on FCEUX src
public sealed class Mapper150 : NES.NESBoardBase
{
private ByteBuffer latch = new ByteBuffer(8);
private int cmd;
private int chr_mask;
private int prg_mask;
public override bool Configure(NES.EDetectionOrigin origin)
{
switch (Cart.board_type)
{
case "MAPPER150":
break;
default:
return false;
}
chr_mask = (Cart.chr_size / 8) - 1;
prg_mask = (Cart.prg_size / 32) - 1;
latch[1] = 3;
return true;
}
public override void SyncState(Serializer ser)
{
base.SyncState(ser);
ser.Sync("latch", ref latch);
ser.Sync("cmd", ref cmd);
}
public override void WriteEXP(int addr, byte value)
{
addr += 0x4000;
Write(addr, value);
SetMirroring(latch[2]);
}
public override void WriteWRAM(int addr, byte value)
{
addr += 0x6000;
Write(addr, value);
SetMirroring(latch[2]);
}
private void Write(int addr, byte value)
{
addr &= 0x4101;
if (addr == 0x4100)
{
cmd = value & 7;
}
else
{
switch (cmd)
{
case 2:
latch[0] = (byte)(value & 1);
latch[3] = (byte)((value & 1) << 3);
break;
case 4:
latch[4] = (byte)((value & 1) << 2);
break;
case 5:
latch[0] = (byte)(value & 7);
break;
case 6:
latch[1] = (byte)(value & 3);
break;
case 7:
latch[2] = (byte)(value >> 1);
break;
}
}
}
private void SetMirroring(byte val)
{
switch (val & 3)
{
case 0:
SetMirrorType(EMirrorType.Horizontal);
break;
case 1:
SetMirrorType(EMirrorType.Vertical);
break;
case 2:
SetMirroring(0, 1, 1, 1);
break;
case 3:
SetMirrorType(EMirrorType.OneScreenB);
break;
}
}
public override byte ReadEXP(int addr)
{
byte ret;
addr += 0x4000;
if ((addr & 0x4100) == 0x4100)
{
ret = (byte)((~cmd) & 0x3F);
}
else
{
ret = NES.DB;
}
return ret;
}
public override byte ReadPRG(int addr)
{
return ROM[((latch[0] & prg_mask) << 15) + addr];
}
public override byte ReadPPU(int addr)
{
if (addr < 0x2000)
{
int bank = latch[1] | latch[3] | latch[4];
bank &= chr_mask;
return VROM[(bank << 13) + addr];
}
return base.ReadPPU(addr);
}
}
}