125 lines
2.7 KiB
C#
125 lines
2.7 KiB
C#
using System;
|
|
using System.IO;
|
|
using System.Diagnostics;
|
|
|
|
namespace BizHawk.Emulation.Consoles.Nintendo
|
|
{
|
|
class Mapper176 : NES.NESBoardBase
|
|
{
|
|
//configuration
|
|
int prg_bank_mask_8k, chr_bank_mask_8k;
|
|
|
|
//state
|
|
int mirror;
|
|
ByteBuffer prg_banks_8k = new ByteBuffer(4);
|
|
ByteBuffer chr_banks_8k = new ByteBuffer(1);
|
|
Bit sbw;
|
|
|
|
public override bool Configure(NES.EDetectionOrigin origin)
|
|
{
|
|
//configure
|
|
switch (Cart.board_type)
|
|
{
|
|
case "MAPPER176":
|
|
break;
|
|
default:
|
|
return false;
|
|
}
|
|
prg_bank_mask_8k = (Cart.prg_size / 8) - 1;
|
|
chr_bank_mask_8k = (Cart.chr_size / 8) - 1;
|
|
|
|
mirror = 0;
|
|
SyncMirror();
|
|
|
|
sbw = 0;
|
|
prg_banks_8k[0] = 0;
|
|
prg_banks_8k[1] = 1;
|
|
prg_banks_8k[2] = 62;
|
|
prg_banks_8k[3] = 63;
|
|
ApplyMemoryMapMask(prg_bank_mask_8k,prg_banks_8k);
|
|
|
|
chr_banks_8k[0] = 0;
|
|
ApplyMemoryMapMask(chr_bank_mask_8k, chr_banks_8k);
|
|
|
|
return true;
|
|
}
|
|
|
|
static readonly EMirrorType[] kMirrorTypes = {EMirrorType.Vertical,EMirrorType.Horizontal,EMirrorType.OneScreenA,EMirrorType.OneScreenB};
|
|
void SyncMirror()
|
|
{
|
|
SetMirrorType(kMirrorTypes[mirror]);
|
|
}
|
|
|
|
public override byte ReadPRG(int addr)
|
|
{
|
|
addr = ApplyMemoryMap(13,prg_banks_8k,addr);
|
|
return ROM[addr];
|
|
}
|
|
|
|
public override void WritePRG(int addr, byte value)
|
|
{
|
|
switch (addr)
|
|
{
|
|
case 0x2000: //0xA000
|
|
mirror = value & 3;
|
|
SyncMirror();
|
|
break;
|
|
case 0x2001: //0xA001
|
|
//we_sram = data & 0x03;
|
|
break;
|
|
}
|
|
}
|
|
|
|
public override byte ReadPPU(int addr)
|
|
{
|
|
if (addr < 0x2000)
|
|
{
|
|
addr = ApplyMemoryMap(13, chr_banks_8k, addr);
|
|
return base.ReadPPUChr(addr);
|
|
}
|
|
else return base.ReadPPU(addr);
|
|
}
|
|
|
|
void SetPrg32k(int value)
|
|
{
|
|
for(int i=0;i<4;i++)
|
|
prg_banks_8k[i] = (byte)(value * 4 + i);
|
|
ApplyMemoryMapMask(prg_bank_mask_8k, prg_banks_8k);
|
|
}
|
|
|
|
public override void WriteEXP(int addr, byte value)
|
|
{
|
|
switch (addr)
|
|
{
|
|
case 0x1000: //0x5000
|
|
break;
|
|
case 0x1001: //0x5001
|
|
if (sbw) SetPrg32k(value);
|
|
break;
|
|
case 0x1010: //0x5010
|
|
if (value == 0x24) sbw = 1;
|
|
break;
|
|
case 0x1011: //0x5011
|
|
if (sbw) SetPrg32k(value >> 1);
|
|
break;
|
|
case 0x1FF1: //0x5FF1
|
|
SetPrg32k(value>>1);
|
|
break;
|
|
case 0x1FF2: //0x5FF2
|
|
chr_banks_8k[0] = (byte)value;
|
|
ApplyMemoryMapMask(chr_bank_mask_8k, chr_banks_8k);
|
|
break;
|
|
}
|
|
}
|
|
|
|
public override void SyncState(Serializer ser)
|
|
{
|
|
base.SyncState(ser);
|
|
ser.Sync("mirror", ref mirror);
|
|
ser.Sync("prg_banks_8k", ref prg_banks_8k);
|
|
ser.Sync("chr_banks_8k", ref chr_banks_8k);
|
|
ser.Sync("sbw", ref sbw);
|
|
}
|
|
}
|
|
}
|