94 lines
1.8 KiB
C#
94 lines
1.8 KiB
C#
using System;
|
|
using System.Collections.Generic;
|
|
using System.Linq;
|
|
using System.Text;
|
|
using BizHawk.Common;
|
|
|
|
namespace BizHawk.Emulation.Cores.Nintendo.NES
|
|
{
|
|
public sealed class Mapper034 : NES.NESBoardBase
|
|
{
|
|
// zombie board that tries to handle both bxrom and ave-nina at once
|
|
|
|
//configuration
|
|
int prg_bank_mask_32k, chr_bank_mask_4k;
|
|
|
|
//state
|
|
ByteBuffer chr = new ByteBuffer(2);
|
|
int prg;
|
|
|
|
|
|
public override bool Configure(NES.EDetectionOrigin origin)
|
|
{
|
|
switch (Cart.board_type)
|
|
{
|
|
case "MAPPER034": // 3-D Battles of World Runner, The (U) [b5].nes
|
|
// TODO: No idea what to assert here
|
|
break;
|
|
default:
|
|
return false;
|
|
}
|
|
|
|
Cart.wram_size = 8;
|
|
prg_bank_mask_32k = Cart.prg_size / 32 - 1;
|
|
chr_bank_mask_4k = Cart.chr_size / 4 - 1;
|
|
|
|
SetMirrorType(Cart.pad_h, Cart.pad_v);
|
|
chr[1] = 1;
|
|
|
|
return true;
|
|
}
|
|
|
|
public override void Dispose()
|
|
{
|
|
chr.Dispose();
|
|
base.Dispose();
|
|
}
|
|
|
|
public override byte ReadPPU(int addr)
|
|
{
|
|
if (addr < 0x2000)
|
|
return (VROM ?? VRAM)[addr & 0xfff | chr[addr >> 12] << 12];
|
|
else
|
|
return base.ReadPPU(addr);
|
|
}
|
|
|
|
public override byte ReadPRG(int addr)
|
|
{
|
|
return ROM[addr | prg << 15];
|
|
}
|
|
|
|
public override void WritePRG(int addr, byte value)
|
|
{
|
|
prg = value & prg_bank_mask_32k;
|
|
}
|
|
|
|
public override void WriteWRAM(int addr, byte value)
|
|
{
|
|
switch (addr)
|
|
{
|
|
case 0x1ffd:
|
|
prg = value & prg_bank_mask_32k;
|
|
break;
|
|
case 0x1ffe:
|
|
chr[0] = (byte)(value & chr_bank_mask_4k);
|
|
break;
|
|
case 0x1fff:
|
|
chr[1] = (byte)(value & chr_bank_mask_4k);
|
|
break;
|
|
default:
|
|
// on NINA, the regs sit on top of WRAM
|
|
base.WriteWRAM(addr, value);
|
|
break;
|
|
}
|
|
}
|
|
|
|
public override void SyncState(Serializer ser)
|
|
{
|
|
base.SyncState(ser);
|
|
ser.Sync("prg", ref prg);
|
|
ser.Sync("chr", ref chr);
|
|
}
|
|
}
|
|
}
|