106 lines
1.8 KiB
C#
106 lines
1.8 KiB
C#
using System.Linq;
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using BizHawk.Common;
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namespace BizHawk.Emulation.Cores.Atari.Atari2600
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{
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/*
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Mapper used for multi-cart 8K games
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*/
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internal class Multicart8K : MapperBase
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{
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private int _bank4K;
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private int _gameTotal;
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private int _currentGame;
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public Multicart8K(int gametotal)
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{
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_gameTotal = gametotal;
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_currentGame = 0;
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}
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public override void SyncState(Serializer ser)
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{
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ser.Sync("bank_4k", ref _bank4K);
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ser.Sync("gameTotal", ref _gameTotal);
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ser.Sync("currentGame", ref _currentGame);
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base.SyncState(ser);
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}
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public override void HardReset()
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{
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_bank4K = 0;
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IncrementGame();
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}
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private void IncrementGame()
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{
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_currentGame++;
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if (_currentGame >= _gameTotal)
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{
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_currentGame = 0;
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}
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}
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private byte ReadMem(ushort addr, bool peek)
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{
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if (!peek)
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{
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Address(addr);
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}
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if (addr < 0x1000)
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{
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return base.ReadMemory(addr);
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}
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return Core.Rom[(_bank4K << 12) + (addr & 0xFFF) + (_currentGame * 8192)];
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}
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public override byte ReadMemory(ushort addr)
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{
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return ReadMem(addr, false);
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}
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public override byte PeekMemory(ushort addr)
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{
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return ReadMem(addr, true);
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}
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private void WriteMem(ushort addr, byte value, bool poke)
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{
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if (!poke)
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{
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Address(addr);
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}
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if (addr < 0x1000)
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{
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base.WriteMemory(addr, value);
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}
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}
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public override void WriteMemory(ushort addr, byte value)
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{
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WriteMem(addr, value, poke: false);
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}
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public override void PokeMemory(ushort addr, byte value)
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{
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WriteMem(addr, value, poke: true);
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}
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private void Address(ushort addr)
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{
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if (addr == 0x1FF8)
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{
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_bank4K = 0;
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}
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else if (addr == 0x1FF9)
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{
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_bank4K = 1;
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}
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}
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}
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}
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