71 lines
1.4 KiB
C#
71 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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// caltron 6 in 1
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internal sealed class Mapper041 : NesBoardBase
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{
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int prg;
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int chr;
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bool regenable;
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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 "MAPPER041":
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case "MLT-CALTRON6IN1":
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break;
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default:
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return false;
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}
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AssertPrg(256);
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AssertChr(128);
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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 WriteWram(int addr, byte value)
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{
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if (addr < 0x800)
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{
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prg = addr & 7;
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SetMirrorType((addr & 32) != 0 ? EMirrorType.Horizontal : EMirrorType.Vertical);
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regenable = (addr & 4) != 0;
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chr &= 3;
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chr |= (addr >> 1) & 0xc;
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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 (regenable)
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{
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chr &= 0xc;
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chr |= addr & 3;
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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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return Vrom[addr | chr << 13];
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else
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return base.ReadPpu(addr);
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}
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public override byte ReadPrg(int addr)
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{
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return Rom[addr | prg << 15];
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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(nameof(prg), ref prg);
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ser.Sync(nameof(chr), ref chr);
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ser.Sync(nameof(regenable), ref regenable);
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}
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}
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}
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