81 lines
1.9 KiB
C#
81 lines
1.9 KiB
C#
using System;
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using System.Collections.Generic;
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using BizHawk.Common;
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namespace BizHawk.Emulation.Cores.Computers.Commodore64
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{
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sealed public class Mapper0012 : Cart
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{
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private byte[] bankMain;
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private byte[][] bankHigh;
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private byte[] bankHighSelected;
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private int bankIndex;
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private byte[] dummyBank;
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// Zaxxon and Super Zaxxon cartridges
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// - read to 8xxx selects bank 0 in A000-BFFF
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// - read to 9xxx selects bank 1 in A000-BFFF
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public Mapper0012(List<int> newAddresses, List<int> newBanks, List<byte[]> newData)
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{
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bankMain = new byte[0x2000];
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bankHigh = new byte[2][];
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dummyBank = new byte[0x2000];
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// create dummy bank just in case
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for (int i = 0; i < 0x2000; i++)
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dummyBank[i] = 0xFF;
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bankHigh[0] = dummyBank;
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bankHigh[1] = dummyBank;
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// load in the banks
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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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Array.Copy(newData[i], bankMain, 0x1000);
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else if ((newAddresses[i] == 0xA000 || newAddresses[i] == 0xE000) && newBanks[i] < 2)
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bankHigh[newBanks[i]] = newData[i];
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}
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// mirror the main rom from 8000 to 9000
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Array.Copy(bankMain, 0x0000, bankMain, 0x1000, 0x1000);
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// set both pins low for 16k rom config
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pinExRom = false;
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pinGame = false;
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}
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public override byte Peek8000(int addr)
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{
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return bankMain[addr];
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}
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public override byte PeekA000(int addr)
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{
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return bankHighSelected[addr];
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}
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public override byte Read8000(int addr)
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{
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bankIndex = (addr & 0x1000) >> 12;
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bankHighSelected = bankHigh[bankIndex];
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return bankMain[addr];
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}
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public override byte ReadA000(int addr)
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{
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return bankHighSelected[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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if (ser.IsReader)
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bankHighSelected = bankHigh[bankIndex];
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}
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}
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}
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