70 lines
1.2 KiB
C#
70 lines
1.2 KiB
C#
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 Mapper074 : MMC3Board_Base
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{
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//http://wiki.nesdev.com/w/index.php/INES_Mapper_074
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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 "MAPPER074":
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break;
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default:
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return false;
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}
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VRAM = new byte[2048];
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BaseSetup();
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return true;
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}
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public override void WritePPU(int addr, byte value)
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{
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if (addr < 0x2000)
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{
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VRAM[addr & 0x7FF] = value;
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}
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else
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{
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base.WritePPU(addr, value);
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}
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}
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private int GetBankNum(int addr)
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{
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int bank_1k = Get_CHRBank_1K(addr);
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bank_1k &= chr_mask;
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return bank_1k;
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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 = GetBankNum(addr);
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if (bank == 0x08)
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{
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return VRAM[addr & 0x03FF];
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}
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else if (bank == 0x09)
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{
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return VRAM[(addr & 0x03FF) + 0x400];
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}
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else
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{
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addr = MapCHR(addr);
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return VROM[addr + extra_vrom];
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}
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}
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else return base.ReadPPU(addr);
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}
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}
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}
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