54 lines
973 B
C#
54 lines
973 B
C#
using BizHawk.Common;
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namespace BizHawk.Emulation.Cores.Nintendo.NES
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{
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// Super Gun 20-in-1
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// http://wiki.nesdev.com/w/index.php/INES_Mapper_214
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internal sealed class Mapper214 : NesBoardBase
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{
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private int _chrReg, _prgReg;
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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 "MAPPER214":
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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(EMirrorType.Vertical);
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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("chrReg", ref _chrReg);
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}
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public override void WritePrg(int addr, byte value)
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{
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_chrReg = addr & 3;
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_prgReg = (addr >> 2) & 3;
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}
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public override byte ReadPrg(int addr)
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{
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return Rom[(_prgReg * 0x4000) + (addr & 0x3FFF)];
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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[(_chrReg * 0x2000) + (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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