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nes: axrom: support 512K oversize

This commit is contained in:
goyuken 2014-03-19 16:06:51 +00:00
parent c6a5c9b295
commit aa2fce885e
1 changed files with 7 additions and 29 deletions
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36
BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/AxROM.cs
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@ -9,8 +9,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
{
//configuration
bool bus_conflict;
int vram_byte_mask;
int prg_mask;
int prg_mask_32k;
//state
int prg;
@ -58,49 +57,28 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
return false;
}
prg_mask = (Cart.prg_size / 16) - 1;
vram_byte_mask = 8 * 1024 - 1; //these boards always have 8KB of VRAM
//it is necessary to write during initialization to set the mirroring
WritePRG(0, 0);
prg_mask_32k = Cart.prg_size / 32 - 1;
SetMirrorType(NES.NESBoardBase.EMirrorType.OneScreenA);
return true;
}
public override byte ReadPRG(int addr)
{
return ROM[addr + (prg << 14)];
return ROM[addr | prg << 15];
}
public override void WritePRG(int addr, byte value)
{
if (ROM != null && bus_conflict) value = HandleNormalPRGConflict(addr,value);
int prg_bank = value & 7;
prg = (prg_bank * 2) & prg_mask;
if (ROM != null && bus_conflict)
value = HandleNormalPRGConflict(addr,value);
prg = value & prg_mask_32k;
if ((value & 0x10) == 0)
SetMirrorType(NES.NESBoardBase.EMirrorType.OneScreenA);
else
SetMirrorType(NES.NESBoardBase.EMirrorType.OneScreenB);
}
public override byte ReadPPU(int addr)
{
if (addr < 0x2000)
{
return VRAM[addr & vram_byte_mask];
}
else return base.ReadPPU(addr);
}
public override void WritePPU(int addr, byte value)
{
if (addr < 0x2000)
{
VRAM[addr & vram_byte_mask] = value;
}
else base.WritePPU(addr,value);
}
public override void SyncState(Serializer ser)
{
base.SyncState(ser);