62 lines
1.2 KiB
C#
62 lines
1.2 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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// 150-in-1
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// http://wiki.nesdev.com/w/index.php/INES_Mapper_202
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public class Mapper202 : NES.NESBoardBase
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{
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private int _reg;
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private bool _isprg32KMode;
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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 "MAPPER202":
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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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base.SyncState(ser);
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ser.Sync("reg", ref _reg);
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ser.Sync("isPrg32kMode", ref _isprg32KMode);
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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 >> 1) & 7;
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_isprg32KMode = addr.Bit(0) && addr.Bit(3);
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SetMirrorType(addr.Bit(0) ? EMirrorType.Horizontal : EMirrorType.Vertical);
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}
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public override byte ReadPRG(int addr)
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{
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if (_isprg32KMode)
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{
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return ROM[((_reg >> 1) * 0x8000) + (addr & 0x7FFF)];
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}
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return ROM[(_reg * 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[(_reg * 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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