65 lines
1.3 KiB
C#
65 lines
1.3 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 Mapper164 : NesBoardBase
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{
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// http://wiki.nesdev.com/w/index.php/INES_Mapper_164
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private int _prgHigh;
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private int _prgLow;
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private int prg_bank_mask_32k;
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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 "MAPPER164":
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break;
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default:
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return false;
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}
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_prgLow = 0xFF;
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prg_bank_mask_32k = Cart.PrgSize / 32 - 1;
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SetMirrorType(Cart.PadH, Cart.PadV);
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return true;
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}
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public override void WriteExp(int addr, byte value)
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{
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addr = (addr + 0x4000) & 0x7300;
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switch (addr)
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{
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case 0x5000:
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_prgLow = value;
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break;
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case 0x5100:
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_prgHigh = value;
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break;
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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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int bank = (_prgHigh << 4) | (_prgLow & 0xF);
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bank &= prg_bank_mask_32k;
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return Rom[(bank * 0x8000) + (addr & 0x7FFF)];
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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("prgHigh", ref _prgHigh);
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ser.Sync("prgLow", ref _prgLow);
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}
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public override void NesSoftReset()
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{
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_prgHigh = 0xFF;
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base.NesSoftReset();
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}
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}
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}
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