118 lines
3.3 KiB
C#
118 lines
3.3 KiB
C#
namespace EMU7800.Core
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{
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/// <summary>
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/// Atari 7800 SuperGame bankswitched cartridge w/Pokey
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/// </summary>
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public sealed class Cart78SGP : Cart
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{
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//
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// Cart Format Mapping to ROM Address Space
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// Bank0: 0x00000:0x4000
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// Bank1: 0x04000:0x4000 0x4000:0x4000 Pokey
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// Bank2: 0x08000:0x4000 0x8000:0x4000 Bank0-7 (0 on startup)
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// Bank3: 0x0c000:0x4000 0xc000:0x4000 Bank7
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// Bank4: 0x10000:0x4000
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// Bank5: 0x14000:0x4000
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// Bank6: 0x18000:0x4000
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// Bank7: 0x1c000:0x4000
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//
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readonly int[] _bank = new int[4];
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PokeySound _pokeySound;
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#region IDevice Members
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public override void Reset()
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{
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base.Reset();
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if (_pokeySound != null)
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_pokeySound.Reset();
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}
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public override byte this[ushort addr]
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{
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get
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{
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var bankNo = addr >> 14;
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switch (bankNo)
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{
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case 1:
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return (_pokeySound != null) ? _pokeySound.Read(addr) : (byte)0;
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default:
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return ROM[(_bank[bankNo] << 14) | (addr & 0x3fff)];
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}
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}
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set
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{
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var bankNo = addr >> 14;
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switch (bankNo)
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{
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case 1:
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if (_pokeySound != null)
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_pokeySound.Update(addr, value);
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break;
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case 2:
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_bank[2] = value & 7;
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break;
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}
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}
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}
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#endregion
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public override void Attach(MachineBase m)
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{
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base.Attach(m);
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if (_pokeySound == null)
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_pokeySound = new PokeySound(M);
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}
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public override void StartFrame()
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{
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if (_pokeySound != null)
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_pokeySound.StartFrame();
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}
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public override void EndFrame()
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{
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if (_pokeySound != null)
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_pokeySound.EndFrame();
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}
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private Cart78SGP()
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{
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}
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public Cart78SGP(byte[] romBytes)
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{
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_bank[2] = 0;
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_bank[3] = 7;
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LoadRom(romBytes, 0x20000);
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}
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#region Serialization Members
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public Cart78SGP(DeserializationContext input, MachineBase m) : base(input)
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{
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input.CheckVersion(1);
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LoadRom(input.ReadBytes());
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_bank = input.ReadIntegers(4);
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_pokeySound = input.ReadOptionalPokeySound(m);
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}
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public override void GetObjectData(SerializationContext output)
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{
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if (_pokeySound == null)
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throw new Emu7800SerializationException("Cart78SGP must be attached before serialization.");
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base.GetObjectData(output);
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output.WriteVersion(1);
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output.Write(ROM);
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output.Write(_bank);
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output.WriteOptional(_pokeySound);
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}
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#endregion
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}
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} |