76 lines
1.3 KiB
C#
76 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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// Mei Loi Siu Ji (Metal Fighter) (Sachen) [!]
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public sealed class Mapper136 : NES.NESBoardBase
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{
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private int _chrBankMask_8k;
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private int _chrRegister;
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public override bool Configure(NES.EDetectionOrigin origin)
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{
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//configure
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switch (Cart.board_type)
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{
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case "MAPPER136":
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break;
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default:
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return false;
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}
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_chrBankMask_8k = Cart.chr_size / 8 - 1;
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return true;
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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 & 0x103) == 0x102)
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{
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_chrRegister = value + 3;
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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 void WritePRG(int addr, byte value)
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{
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if ((addr & 0x103) == 0x102)
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{
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_chrRegister = value + 3;
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}
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}
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public override byte ReadEXP(int addr)
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{
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if (addr == 0x100)
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{
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return (byte)((_chrRegister & 0x3F) | (NES.DB & 0xC0));
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}
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else
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{
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return base.ReadEXP(addr);
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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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{
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int bank = _chrRegister & _chrBankMask_8k;
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return VROM[(bank * 0x2000) + (addr & 0x1FFF)];
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}
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return base.ReadPPU(addr);
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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("chrRegister", ref _chrRegister);
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}
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}
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}
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