79 lines
1.5 KiB
C#
79 lines
1.5 KiB
C#
using BizHawk.Common;
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using BizHawk.Common.NumberExtensions;
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namespace BizHawk.Emulation.Cores.Nintendo.NES
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{
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public sealed class Mapper60 : NES.NESBoardBase
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{
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// http://wiki.nesdev.com/w/index.php/INES_Mapper_060
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private int _reg;
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private bool IsPrg16Mode { get { return _reg.Bit(7); } }
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[MapperProp]
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public int Mapper60_DipSwitch;
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private const int DipSwitchMask = 3;
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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 "MAPPER060":
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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("_reg", ref _reg);
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}
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public override void WritePRG(int addr, byte value)
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{
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_reg = addr;
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int mirr = ((_reg & 8) >> 3) ^ 1;
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SetMirrorType(mirr > 0 ? EMirrorType.Vertical : EMirrorType.Horizontal);
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}
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public override byte ReadPRG(int addr)
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{
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if ((_reg & 0x100) > 0)
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{
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return (byte)(Mapper60_DipSwitch & DipSwitchMask);
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}
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if (IsPrg16Mode)
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{
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int bank = (_reg >> 4) & 7;
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return ROM[(bank * 0x4000) + (addr & 0x3FFF)];
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}
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else
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{
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int bank = (_reg >> 5) & 3;
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return ROM[(bank * 0x8000) + (addr & 0x7FFF)];
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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)
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{
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return VROM[((_reg & 7) * 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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