95 lines
2.1 KiB
C#
95 lines
2.1 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.Cartridge
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{
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internal sealed class Mapper0012 : CartridgeDevice
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{
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private readonly int[] _bankMain;
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private readonly int[][] _bankHigh;
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private int[] _bankHighSelected;
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private int _bankIndex;
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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(IList<int> newAddresses, IList<int> newBanks, IList<int[]> newData)
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{
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_bankMain = new int[0x2000];
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_bankHigh = new int[2][];
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var dummyBank = new int[0x2000];
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// create dummy bank just in case
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for (var i = 0; i < 0x2000; i++)
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{
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dummyBank[i] = 0xFF;
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}
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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 (var 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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Array.Copy(newData[i], _bankMain, 0x1000);
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}
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else if ((newAddresses[i] == 0xA000 || newAddresses[i] == 0xE000) && newBanks[i] < 2)
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{
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_bankHigh[newBanks[i]] = newData[i];
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}
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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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protected override void SyncStateInternal(Serializer ser)
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{
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ser.Sync("BankHighSelected", ref _bankHighSelected, useNull: false);
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ser.Sync("BankIndex", ref _bankIndex);
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}
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public override int Peek8000(int addr)
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{
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return _bankMain[addr];
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}
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public override int PeekA000(int addr)
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{
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return _bankHighSelected[addr];
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}
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public override int 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 int 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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{
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_bankHighSelected = _bankHigh[_bankIndex];
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}
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}
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}
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}
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