70 lines
1.4 KiB
C#
70 lines
1.4 KiB
C#
using System;
|
|
using System.IO;
|
|
using System.Diagnostics;
|
|
|
|
namespace BizHawk.Emulation.Consoles.Nintendo
|
|
{
|
|
class Mapper178 : NES.NESBoardBase
|
|
{
|
|
//configuration
|
|
int prg_bank_mask_32k;
|
|
|
|
//state
|
|
ByteBuffer prg_banks_32k = new ByteBuffer(1);
|
|
int reg4802;
|
|
|
|
public override bool Configure(NES.EDetectionOrigin origin)
|
|
{
|
|
//configure
|
|
switch (Cart.board_type)
|
|
{
|
|
case "MAPPER178":
|
|
break;
|
|
default:
|
|
return false;
|
|
}
|
|
prg_bank_mask_32k = (Cart.prg_size / 32) - 1;
|
|
|
|
prg_banks_32k[0] = 0;
|
|
|
|
SetMirrorType(EMirrorType.Vertical);
|
|
|
|
return true;
|
|
}
|
|
|
|
public override void WriteEXP(int addr, byte value)
|
|
{
|
|
switch (addr)
|
|
{
|
|
case 0x0800: //$4800
|
|
SetMirrorType(value.Bit(0) ? EMirrorType.Horizontal : EMirrorType.Vertical);
|
|
break;
|
|
case 0x0801: //$4801
|
|
{
|
|
int reg4801 = (value >> 1) & 0xF;
|
|
int prg = reg4801 + (reg4802 << 2);
|
|
prg_banks_32k[0] = (byte)prg;
|
|
ApplyMemoryMapMask(prg_bank_mask_32k, prg_banks_32k);
|
|
break;
|
|
}
|
|
case 0x0802: //$4802
|
|
reg4802 = value;
|
|
break;
|
|
}
|
|
}
|
|
|
|
public override byte ReadPRG(int addr)
|
|
{
|
|
addr = ApplyMemoryMap(15, prg_banks_32k, addr);
|
|
return ROM[addr];
|
|
}
|
|
|
|
public override void SyncState(Serializer ser)
|
|
{
|
|
base.SyncState(ser);
|
|
ser.Sync("prg_banks_32k", ref prg_banks_32k);
|
|
ser.Sync("reg4802", ref reg4802);
|
|
}
|
|
}
|
|
}
|