55 lines
1.5 KiB
C#
55 lines
1.5 KiB
C#
namespace EMU7800.Core
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{
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/// <summary>
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/// Activison's Robot Tank and Decathlon 8KB bankswitching cart.
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/// </summary>
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public sealed class CartDC8K : Cart
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{
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//
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// Cart Format Mapping to ROM Address Space
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// Bank1: 0x0000:0x1000 0x1000:0x1000 Bank selected by A13=0/1?
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// Bank2: 0x1000:0x1000
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//
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// This does what the Stella code does, which is to follow A13 to determine
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// the bank. Since A0-A12 are the only significant bits on the program
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// counter, I am unsure how the cart/hardware could utilize this.
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//
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#region IDevice Members
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public override byte this[ushort addr]
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{
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get { return (addr & 0x2000) == 0 ? ROM[addr & 0x0fff + 0x1000] : ROM[addr & 0x0fff]; }
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set { }
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}
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#endregion
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private CartDC8K()
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{
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}
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public CartDC8K(byte[] romBytes)
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{
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LoadRom(romBytes, 0x2000);
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}
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#region Serialization Members
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public CartDC8K(DeserializationContext input, MachineBase m) : base(input)
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{
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input.CheckVersion(1);
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LoadRom(input.ReadExpectedBytes(0x2000), 0x2000);
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}
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public override void GetObjectData(SerializationContext output)
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{
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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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}
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#endregion
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}
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} |