62 lines
1.3 KiB
C#
62 lines
1.3 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.Cores.Nintendo.NES
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{
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// what is this?
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public class Mapper029 : NES.NESBoardBase
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{
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int prg;
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int chr;
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int prg_bank_mask_16k;
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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 "Mapper029":
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case "UNIF_JERKFACE":
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case "UNIF_RET-CUFROM":
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break;
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default:
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return false;
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}
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SetMirrorType(EMirrorType.Vertical);
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AssertChr(0);
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AssertPrg(32, 64, 128, 256, 512, 1024);
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Cart.wram_size = 8;
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Cart.vram_size = 32;
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prg_bank_mask_16k = Cart.prg_size / 16 - 1;
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return true;
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}
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public override void WritePRG(int addr, byte value)
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{
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chr = value & 3;
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prg = (value >> 2) & prg_bank_mask_16k;
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}
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public override byte ReadPRG(int addr)
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{
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int bank = addr >= 0x4000 ? prg_bank_mask_16k : prg;
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return ROM[bank << 14 | addr & 0x3fff];
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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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return VRAM[addr | chr << 13];
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else
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return base.ReadPPU(addr);
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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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VRAM[addr | chr << 13] = value;
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else
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base.WritePPU(addr, value);
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}
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}
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}
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