59 lines
1.2 KiB
C#
59 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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public class Mapper221 : NES.NESBoardBase
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{
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IntBuffer regs = new IntBuffer(2);
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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 "MAPPER221":
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case "UNIF_BMC-N625092":
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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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ser.Sync("regs", ref regs);
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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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if (addr < 0x4000)
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{
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SetMirrorType(addr.Bit(0) ? EMirrorType.Horizontal : EMirrorType.Vertical);
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regs[0] = addr >> 1 & 0xFF;
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}
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else
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{
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regs[1] = addr & 7;
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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;
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if (addr < 0x4000)
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{
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bank = (regs[0] >> 1 & 0x38) | ((regs[0].Bit(0)) ? ((regs[0] & 0x80) > 0) ? regs[1] : (regs[1] & 0x6) | 0x0 : regs[1]);
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}
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else
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{
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bank = (regs[0] >> 1 & 0x38) | ((regs[0].Bit(0) ? ((regs[0] & 0x80) > 0) ? 0x7 : (regs[1] & 0x6) | 0x1 : regs[1]));
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}
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return ROM[(bank << 14) + (addr & 0x3FFF)];
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}
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}
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}
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