122 lines
2.9 KiB
C#
122 lines
2.9 KiB
C#
using System;
|
|
using System.IO;
|
|
using System.Diagnostics;
|
|
|
|
namespace BizHawk.Emulation.Consoles.Nintendo
|
|
{
|
|
class Mapper227 : NES.NESBoardBase
|
|
{
|
|
//configuration
|
|
int prg_bank_mask_16k;
|
|
|
|
//state
|
|
int prg;
|
|
bool vram_protected;
|
|
ByteBuffer prg_banks_16k = new ByteBuffer(2);
|
|
|
|
//1200-in-1
|
|
//[NJXXX] Xiang Shuai Chuan Qi
|
|
|
|
public override bool Configure(NES.EDetectionOrigin origin)
|
|
{
|
|
//configure
|
|
switch (Cart.board_type)
|
|
{
|
|
case "MAPPER227":
|
|
//AssertVram(16);
|
|
Cart.vram_size = 16;
|
|
break;
|
|
default:
|
|
return false;
|
|
}
|
|
prg_bank_mask_16k = (Cart.prg_size / 16) - 1;
|
|
|
|
SetMirrorType(EMirrorType.Vertical);
|
|
vram_protected = false;
|
|
prg_banks_16k[0] = prg_banks_16k[1] = 0;
|
|
return true;
|
|
}
|
|
|
|
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 void WritePRG(int addr, byte value)
|
|
{
|
|
bool S = addr.Bit(0);
|
|
bool M_horz = addr.Bit(1);
|
|
int p = (addr >> 2) & 0x1F;
|
|
p += addr.Bit(8) ? 0x20 : 0;
|
|
bool o = addr.Bit(7);
|
|
bool L = addr.Bit(9);
|
|
|
|
//virtuaNES doesnt do this.
|
|
//fceux does it...
|
|
//if we do it, [NJXXX] Xiang Shuai Chuan Qi will not be able to set any patterns
|
|
//maybe only the multicarts do it, to keep the game from clobbering vram on accident
|
|
//vram_protected = o;
|
|
|
|
if (o == true && S == false)
|
|
{
|
|
prg_banks_16k[0] = (byte)(p);
|
|
prg_banks_16k[1] = (byte)(p);
|
|
}
|
|
if (o == true && S == true)
|
|
{
|
|
prg_banks_16k[0] = (byte)((p & ~1));
|
|
prg_banks_16k[1] = (byte)((p & ~1) + 1);
|
|
}
|
|
if (o == false && S == false && L == false)
|
|
{
|
|
prg_banks_16k[0] = (byte)p;
|
|
prg_banks_16k[1] = (byte)(p & 0x38);
|
|
}
|
|
if (o == false && S == true && L == false)
|
|
{
|
|
prg_banks_16k[0] = (byte)(p & 0x3E);
|
|
prg_banks_16k[1] = (byte)(p & 0x38);
|
|
}
|
|
if (o == false && S == false && L == true)
|
|
{
|
|
prg_banks_16k[0] = (byte)p;
|
|
prg_banks_16k[1] = (byte)(p | 0x07);
|
|
}
|
|
if (o == false && S == true && L == true)
|
|
{
|
|
prg_banks_16k[0] = (byte)(p & 0x3E);
|
|
prg_banks_16k[1] = (byte)(p | 0x07);
|
|
}
|
|
|
|
prg_banks_16k[0] = (byte)(prg_banks_16k[0]&prg_bank_mask_16k);
|
|
prg_banks_16k[1] = (byte)(prg_banks_16k[1]&prg_bank_mask_16k);
|
|
|
|
if (M_horz) SetMirrorType(EMirrorType.Horizontal);
|
|
else SetMirrorType(EMirrorType.Vertical);
|
|
}
|
|
|
|
|
|
public override void WritePPU(int addr, byte value)
|
|
{
|
|
if (addr < 0x2000)
|
|
{
|
|
if (vram_protected)
|
|
return;
|
|
else base.WritePPU(addr, value);
|
|
}
|
|
else base.WritePPU(addr, value);
|
|
}
|
|
|
|
public override void SyncState(Serializer ser)
|
|
{
|
|
base.SyncState(ser);
|
|
ser.Sync("prg", ref prg);
|
|
}
|
|
}
|
|
}
|