61 lines
1017 B
C#
61 lines
1017 B
C#
using BizHawk.Common;
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namespace BizHawk.Emulation.Cores.Nintendo.NES
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{
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public sealed class Mapper170 : NES.NESBoardBase
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{
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private byte reg;
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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 "MAPPER170":
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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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public override void SyncState(Serializer ser)
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{
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ser.Sync("reg", ref reg);
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base.SyncState(ser);
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}
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public override byte ReadPRG(int addr)
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{
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if (addr < 0x4000)
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{
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return base.ReadPRG(addr);
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}
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int last16kBank = ROM.Length - 0x4000;
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return ROM[last16kBank + (addr & 0x3FFF)];
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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 == 0x502 || addr == 0x1000)
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{
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reg = (byte)(value << 1 & 0x80);
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}
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base.WriteWRAM(addr, value);
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}
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public override byte ReadWRAM(int addr)
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{
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if (addr == 0x1001 || addr == 0x1777)
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{
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return (byte)(reg | NES.DB & 0x7F);
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}
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return base.ReadWRAM(addr);
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}
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}
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}
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