118 lines
2.4 KiB
C#
118 lines
2.4 KiB
C#
using System;
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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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internal sealed class Mapper236 : NesBoardBase
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{
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[MapperProp]
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public byte CartSwitch_70in1 = 0xd;
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[MapperProp]
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public byte CartSwitch_800in1 = 06;
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private bool isLargeBanks = false;
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private byte large_bank;
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private byte prg_bank;
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private byte chr_bank;
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private byte bank_mode;
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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 "UNIF_BMC-70in1":
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isLargeBanks = false;
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break;
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case "MAPPER236":
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case "UNIF_BMC-70in1B":
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isLargeBanks = true;
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break;
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default:
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return false;
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}
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AutoMapperProps.Apply(this);
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return true;
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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(isLargeBanks), ref isLargeBanks);
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ser.Sync(nameof(large_bank), ref large_bank);
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ser.Sync(nameof(prg_bank), ref prg_bank);
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ser.Sync(nameof(chr_bank), ref chr_bank);
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ser.Sync(nameof(bank_mode), ref bank_mode);
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ser.Sync("Cart_Switch", ref CartSwitch_70in1);
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ser.Sync("Cart_Switch", ref CartSwitch_800in1);
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}
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public override void WritePrg(int addr, byte value)
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{
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addr += 0x8000;
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if ((addr & 0x4000) > 0)
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{
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bank_mode = (byte)(addr & 0x30);
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prg_bank = (byte)(addr & 7);
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}
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else
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{
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var mirroring = ((addr & 0x20) >> 5) ^ 1;
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SetMirrorType(mirroring > 0 ? EMirrorType.Vertical : EMirrorType.Horizontal);
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if (isLargeBanks)
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{
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large_bank = (byte)((addr & 3) << 3);
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}
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else
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{
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chr_bank = (byte)(addr & 7);
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}
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}
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}
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public override byte ReadPrg(int addr)
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{
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switch (bank_mode)
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{
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default:
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throw new InvalidOperationException("Unexpected bank_mode value");
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case 0x00:
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case 0x10:
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int bank;
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if (addr < 0x4000)
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{
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bank = (large_bank | prg_bank);
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}
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else
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{
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bank = (large_bank | 7);
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}
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if (bank_mode == 0x10)
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{
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addr = (addr & 0x7FF0) | ((isLargeBanks ? CartSwitch_800in1 : CartSwitch_70in1) & 0xf);
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}
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return Rom[(bank << 14) + (addr & 0x3FFF)];
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case 0x20:
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return Rom[(((large_bank | prg_bank) >> 1) << 15) + addr];
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case 0x30:
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return Rom[((large_bank | prg_bank) << 14) + (addr & 0x3FFF)];
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}
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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 && Vrom != null)
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{
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return Vrom[(chr_bank << 13) + (addr & 0x1FFF)];
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}
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return base.ReadPpu(addr);
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}
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}
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}
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