67 lines
1.3 KiB
C#
67 lines
1.3 KiB
C#
using BizHawk.Common;
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using BizHawk.Common.NumberExtensions;
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// http://wiki.nesdev.com/w/index.php/INES_Mapper_233
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namespace BizHawk.Emulation.Cores.Nintendo.NES
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{
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internal sealed class Mapper233 : NesBoardBase
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{
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public int prg_page;
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public bool prg_mode;
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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 "MAPPER233":
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break;
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default:
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return false;
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}
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prg_mode = false;
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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(nameof(prg_page), ref prg_page);
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ser.Sync(nameof(prg_mode), ref prg_mode);
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base.SyncState(ser);
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}
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public override void WritePrg(int addr, byte value)
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{
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prg_page = value & 0x1F;
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prg_mode = value.Bit(5);
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int mirror = value >> 6;
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switch (mirror)
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{
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case 0:
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SetMirroring(0, 0, 0, 1);
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break;
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case 1:
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SetMirrorType(EMirrorType.Vertical);
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break;
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case 2:
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SetMirrorType(EMirrorType.Horizontal);
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break;
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case 3:
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SetMirrorType(EMirrorType.OneScreenB);
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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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if (prg_mode == false)
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{
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return Rom[((prg_page >> 1) * 0x8000) + addr];
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}
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return Rom[(prg_page * 0x4000) + (addr & 0x3FFF)];
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}
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}
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}
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