79 lines
1.7 KiB
C#
79 lines
1.7 KiB
C#
using System.Collections.Generic;
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using BizHawk.Common;
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namespace BizHawk.Emulation.Cores.Nintendo.NES
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{
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public class Mapper244 : NES.NESBoardBase
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{
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public override bool Configure(NES.EDetectionOrigin origin)
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{
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switch (Cart.board_type)
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{
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case "MAPPER244":
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break;
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default:
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return false;
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}
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return true;
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}
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private List<List<byte>> prg_perm = new List<List<byte>>
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{
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new List<byte> { 0, 1, 2, 3, },
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new List<byte> { 3, 2, 1, 0, },
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new List<byte> { 0, 2, 1, 3, },
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new List<byte> { 3, 1, 2, 0, },
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};
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private List<List<byte>> chr_perm = new List<List<byte>>
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{
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new List<byte> { 0, 1, 2, 3, 4, 5, 6, 7, },
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new List<byte> { 0, 2, 1, 3, 4, 6, 5, 7, },
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new List<byte> { 0, 1, 4, 5, 2, 3, 6, 7, },
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new List<byte> { 0, 4, 1, 5, 2, 6, 3, 7, },
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new List<byte> { 0, 4, 2, 6, 1, 5, 3, 7, },
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new List<byte> { 0, 2, 4, 6, 1, 3, 5, 7, },
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new List<byte> { 7, 6, 5, 4, 3, 2, 1, 0, },
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new List<byte> { 7, 6, 5, 4, 3, 2, 1, 0, }
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};
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private int _chrRegister = 0;
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private int _prgRegister = 0;
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public override void SyncState(Serializer ser)
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{
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base.SyncState(ser);
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ser.Sync("chrRegister", ref _chrRegister);
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ser.Sync("prgRegister", ref _prgRegister);
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}
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public override byte ReadPPU(int addr)
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{
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if (addr < 0x2000)
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{
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return VROM[(_chrRegister * 0x2000) + (addr & 0x1FFF)];
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}
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return base.ReadPPU(addr);
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}
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public override byte ReadPRG(int addr)
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{
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return ROM[(_prgRegister * 0x8000) + (addr & 0x7FFF)];
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}
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public override void WritePRG(int addr, byte value)
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{
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if ((value & 0x08) > 0)
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{
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_chrRegister = chr_perm[(value >> 4) & 7][value & 7];
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}
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else
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{
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_prgRegister = prg_perm[(value >> 4) & 3][value & 3];
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}
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}
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}
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}
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