91 lines
2.0 KiB
C#
91 lines
2.0 KiB
C#
using BizHawk.Common;
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namespace BizHawk.Emulation.Cores.Nintendo.NES
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{
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// http://wiki.nesdev.com/w/index.php/INES_Mapper_193
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internal sealed class Mapper193 : NesBoardBase
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{
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private int prg_bank_mask_8k;
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private byte[] prg_banks_8k = new byte[4];
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private int chr_bank_mask_2k;
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private byte[] chr_banks_2k = new byte[4];
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public override bool Configure(EDetectionOrigin origin)
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{
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switch (Cart.BoardType)
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{
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case "MAPPER193":
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break;
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case "NTDEC-TC-112": // untested
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break;
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default:
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return false;
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}
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prg_bank_mask_8k = (Cart.PrgSize / 8) - 1;
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prg_banks_8k[1] = 0xFD;
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prg_banks_8k[2] = 0xFE;
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prg_banks_8k[3] = 0xFF;
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chr_bank_mask_2k = (Cart.ChrSize / 2) - 1;
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SetMirrorType(EMirrorType.Vertical);
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SyncMap();
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return true;
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}
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private void SyncMap()
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{
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ApplyMemoryMapMask(prg_bank_mask_8k, prg_banks_8k);
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ApplyMemoryMapMask(chr_bank_mask_2k, chr_banks_2k);
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}
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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(nameof(prg_banks_8k), ref prg_banks_8k, false);
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ser.Sync(nameof(chr_banks_2k), ref chr_banks_2k, false);
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}
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public override void WriteWram(int addr, byte value)
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{
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addr &= 0x6003;
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switch (addr)
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{
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case 0:
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chr_banks_2k[0] = (byte)((value & ~3) >> 1);
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chr_banks_2k[1] = (byte)(((value & ~3) >> 1) + 1);
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break;
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case 1:
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chr_banks_2k[2] = (byte)((value & ~1) >> 1);
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break;
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case 2:
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chr_banks_2k[3] = (byte)((value & ~1) >> 1);
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break;
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case 3:
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prg_banks_8k[0] = value;
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break;
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}
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SyncMap();
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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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addr = ApplyMemoryMap(11, chr_banks_2k, addr);
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return base.ReadPPUChr(addr);
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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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addr = ApplyMemoryMap(13, prg_banks_8k, addr);
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return Rom[addr];
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}
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}
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}
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