81 lines
1.7 KiB
C#
81 lines
1.7 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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namespace BizHawk.Emulation.Consoles.Nintendo
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{
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class Mapper50 : NES.NESBoardBase
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{
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//http://wiki.nesdev.com/w/index.php/INES_Mapper_050
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byte prg_bank;
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int prg_bank_mask_8k;
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public override bool Configure(NES.EDetectionOrigin origin)
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{
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//analyze board type
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switch (Cart.board_type)
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{
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case "MAPPER050":
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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 = 0;
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prg_bank_mask_8k = Cart.prg_size / 8 - 1;
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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("prg_bank", ref prg_bank);
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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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addr &= 0x0120;
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if (addr == 0x0020)
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{
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//byte low = (byte)((value >> 1) & 0x03);
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//byte middle = (byte)(value & 0x01);
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//byte high = (byte)((value >> 3) & 0x01);
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//prg_bank = (byte)(low | (middle << 2) | (high << 3));
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prg_bank = (byte)(((value & 1) << 2) | ((value & 2) >> 1) | ((value & 4) >> 1) | (value & 8));
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Console.WriteLine(prg_bank);
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}
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base.WriteEXP(addr, value);
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}
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public override byte ReadPRG(int addr)
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{
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if (addr < 0x2000)
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{
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return ROM[(0x08 * 0x2000) + (addr & 0x1FFF)];
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}
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else if (addr < 0x4000)
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{
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return ROM[(0x09 * 0x2000) + (addr & 0x1FFF)];
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}
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else if (addr < 0x6000)
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{
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int bank = (prg_bank & prg_bank_mask_8k);
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return ROM[(bank * 0x2000) + (addr & 0x1FFF)];
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}
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else
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{
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return ROM[(0x0B * 0x2000) + (addr & 0x1FFF)];
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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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return ROM[(0x0F * 0x2000) + (addr & 0x1FFF)];
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}
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}
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}
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