97 lines
2.1 KiB
C#
97 lines
2.1 KiB
C#
using System;
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using System.Collections.Generic;
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namespace BizHawk.Emulation.Cores.Computers.Commodore64
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{
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sealed public class Mapper0000 : Cart
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{
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private byte[] romA;
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private int romAMask;
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private byte[] romB;
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private int romBMask;
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// standard cartridge mapper (Commodore)
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// note that this format also covers Ultimax carts
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public Mapper0000(List<int> newAddresses, List<int> newBanks, List<byte[]> newData, bool game, bool exrom)
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{
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pinGame = game;
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pinExRom = exrom;
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validCartridge = true;
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// default to empty banks
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romA = new byte[1];
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romB = new byte[1];
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romA[0] = 0xFF;
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romB[0] = 0xFF;
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for (int i = 0; i < newAddresses.Count; i++)
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{
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if (newAddresses[i] == 0x8000)
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{
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switch (newData[i].Length)
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{
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case 0x1000:
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romAMask = 0x0FFF;
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romA = newData[i];
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break;
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case 0x2000:
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romAMask = 0x1FFF;
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romA = newData[i];
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break;
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case 0x4000:
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romAMask = 0x1FFF;
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romBMask = 0x1FFF;
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// split the rom into two banks
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romA = new byte[0x2000];
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romB = new byte[0x2000];
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Array.Copy(newData[i], 0x0000, romA, 0x0000, 0x2000);
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Array.Copy(newData[i], 0x2000, romB, 0x0000, 0x2000);
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break;
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default:
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validCartridge = false;
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return;
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}
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}
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else if (newAddresses[i] == 0xA000 || newAddresses[i] == 0xE000)
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{
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switch (newData[i].Length)
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{
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case 0x1000:
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romBMask = 0x0FFF;
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break;
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case 0x2000:
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romBMask = 0x1FFF;
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break;
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default:
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validCartridge = false;
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return;
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}
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romB = newData[i];
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}
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}
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}
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public override byte Peek8000(int addr)
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{
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return romA[addr & romAMask];
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}
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public override byte PeekA000(int addr)
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{
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return romB[addr & romBMask];
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}
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public override byte Read8000(int addr)
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{
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return romA[addr & romAMask];
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}
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public override byte ReadA000(int addr)
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{
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return romB[addr & romBMask];
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}
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}
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}
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