74 lines
1.3 KiB
C#
74 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 Mapper162 : NesBoardBase
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{
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private byte[] reg = new byte[8];
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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 "MAPPER162":
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case "UNIF_UNL-FS304":
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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_bank_mask_32k = Cart.PrgSize / 32 - 1;
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reg[0] = 3;
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reg[3] = 7;
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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 reg, false);
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base.SyncState(ser);
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}
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public override void WriteExp(int addr, byte value)
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{
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if (addr >= 0x1000)
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{
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reg[(addr >> 8) & 3] = value;
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}
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else
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{
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base.WriteExp(addr, value);
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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 = 0;
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switch (reg[3] & 7)
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{
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case 0:
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case 2:
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bank = (reg[0] & 0xc) | (reg[1] & 2) | ((reg[2] & 0xf) << 4);
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break;
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case 1:
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case 3:
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bank = (reg[0] & 0xc) | (reg[2] & 0xf) << 4;
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break;
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case 4:
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case 6:
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bank = (reg[0] & 0xe) | ((reg[1] >> 1) & 1) | ((reg[2] & 0xf) << 4);
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break;
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case 5:
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case 7:
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bank = (reg[0] & 0xf) | ((reg[2] & 0xf) << 4);
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break;
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}
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return Rom[((bank & prg_bank_mask_32k) << 15) + addr];
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}
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}
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}
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