73 lines
1.4 KiB
C#
73 lines
1.4 KiB
C#
using BizHawk.Common;
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namespace BizHawk.Emulation.Cores.Nintendo.NES
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{
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internal sealed class Mapper125 : NesBoardBase
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{
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private byte reg;
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private int prg_bank_mask_8k;
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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 "MAPPER125":
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case "UNIF_UNL-LH32":
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break;
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default:
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return false;
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}
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SetMirrorType(Cart.PadH, Cart.PadV);
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prg_bank_mask_8k = Cart.PrgSize / 8 - 1;
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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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ser.Sync(nameof(reg), ref reg);
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base.SyncState(ser);
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}
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public override void WriteWram(int addr, byte value)
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{
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if (addr == 0)
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{
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reg = value;
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}
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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 ((addr >= 0x4000) && (addr < 0x6000))
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Wram[addr - 0x4000] = value;
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else
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base.WritePrg(addr, value);
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}
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public override byte ReadPrg(int addr)
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{
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int bank = 0;
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if (addr < 0x2000) { bank = prg_bank_mask_8k - 3; }
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else if (addr < 0x4000) { bank = prg_bank_mask_8k - 2; }
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// for some reason WRAM is mapped to here.
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else if (addr < 0x6000)
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{
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return Wram[addr - 0x4000];
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}
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else { bank = prg_bank_mask_8k; }
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bank &= prg_bank_mask_8k;
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return Rom[(bank << 13) + (addr & 0x1FFF)];
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}
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public override byte ReadWram(int addr)
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{
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return Rom[((reg & prg_bank_mask_8k) << 13) + addr];
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}
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}
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}
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