88 lines
2.0 KiB
C#
88 lines
2.0 KiB
C#
using System;
|
|
using System.IO;
|
|
using System.Diagnostics;
|
|
|
|
namespace BizHawk.Emulation.Consoles.Nintendo
|
|
{
|
|
//AKA Sunsoft-2 chip (SUNSOFT-3 pcb)
|
|
//game=Tenka no Goikenban: Mito Koumon ; chip=sunsoft-2 ; pcb = SUNSOFT-3
|
|
//this is confusing. see docs/sunsoft.txt
|
|
class Mapper89 : NES.NESBoardBase
|
|
{
|
|
int chr;
|
|
int prg_bank_mask_16k;
|
|
byte prg_bank_16k;
|
|
ByteBuffer prg_banks_16k = new ByteBuffer(2);
|
|
|
|
public override bool Configure(NES.EDetectionOrigin origin)
|
|
{
|
|
switch (Cart.board_type)
|
|
{
|
|
case "MAPPER089":
|
|
break;
|
|
case "SUNSOFT-2":
|
|
if (Cart.pcb != "SUNSOFT-3") return false;
|
|
break;
|
|
default:
|
|
return false;
|
|
}
|
|
|
|
SetMirrorType(Cart.pad_h, Cart.pad_v);
|
|
prg_bank_mask_16k = (Cart.prg_size / 16) - 1;
|
|
prg_banks_16k[1] = 0xFF;
|
|
return true;
|
|
}
|
|
|
|
public override void Dispose()
|
|
{
|
|
prg_banks_16k.Dispose();
|
|
base.Dispose();
|
|
}
|
|
|
|
public override void SyncState(Serializer ser)
|
|
{
|
|
base.SyncState(ser);
|
|
ser.Sync("chr", ref chr);
|
|
ser.Sync("prg_bank_mask_16k", ref prg_bank_mask_16k);
|
|
ser.Sync("prg_bank_16k", ref prg_bank_16k);
|
|
ser.Sync("prg_banks_16k", ref prg_banks_16k);
|
|
}
|
|
|
|
void SyncPRG()
|
|
{
|
|
prg_banks_16k[0] = prg_bank_16k;
|
|
}
|
|
|
|
public override void WritePRG(int addr, byte value)
|
|
{
|
|
prg_bank_16k = (byte)((value >> 4) & 7);
|
|
SyncPRG();
|
|
|
|
if (value.Bit(3) == false)
|
|
SetMirrorType(EMirrorType.OneScreenA);
|
|
else
|
|
SetMirrorType(EMirrorType.OneScreenB);
|
|
|
|
chr = ((value & 0x07) + ((value >> 7) * 0x08));
|
|
}
|
|
|
|
public override byte ReadPRG(int addr)
|
|
{
|
|
int bank_16k = addr >> 14;
|
|
int ofs = addr & ((1 << 14) - 1);
|
|
bank_16k = prg_banks_16k[bank_16k];
|
|
bank_16k &= prg_bank_mask_16k;
|
|
addr = (bank_16k << 14) | ofs;
|
|
return ROM[addr];
|
|
}
|
|
|
|
public override byte ReadPPU(int addr)
|
|
{
|
|
if (addr < 0x2000)
|
|
return VROM[(addr & 0x1FFF) + (chr * 0x2000)];
|
|
else
|
|
return base.ReadPPU(addr);
|
|
}
|
|
}
|
|
}
|