2019-02-03 00:42:55 +00:00
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namespace EightBit
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2019-02-02 15:12:51 +00:00
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{
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public abstract class LittleEndianProcessor : Processor
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{
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protected LittleEndianProcessor(Bus memory)
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: base(memory)
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{
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}
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2019-02-03 00:42:55 +00:00
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public override ushort PeekWord(ushort address)
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2019-02-02 15:12:51 +00:00
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{
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var low = Bus.Peek(address);
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var high = Bus.Peek(++address);
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2019-02-03 00:42:55 +00:00
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return MakeWord(low, high);
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2019-02-02 15:12:51 +00:00
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}
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2019-02-03 00:42:55 +00:00
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public override void PokeWord(ushort address, ushort value)
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{
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2019-02-03 00:42:55 +00:00
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Bus.Poke(address, LowByte(value));
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Bus.Poke(++address, HighByte(value));
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2019-02-02 15:12:51 +00:00
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}
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2019-02-03 00:42:55 +00:00
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protected override ushort FetchWord()
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{
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var low = FetchByte();
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var high = FetchByte();
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2019-02-03 00:42:55 +00:00
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return MakeWord(low, high);
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2019-02-02 15:12:51 +00:00
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}
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2019-02-03 00:42:55 +00:00
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protected override ushort GetWord()
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{
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var low = BusRead();
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2019-02-03 00:42:55 +00:00
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++Bus.Address;
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2019-02-02 15:12:51 +00:00
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var high = BusRead();
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2019-02-03 00:42:55 +00:00
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return MakeWord(low, high);
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2019-02-02 15:12:51 +00:00
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}
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2019-02-03 00:42:55 +00:00
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protected override ushort GetWordPaged(byte page, byte offset)
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{
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2019-02-03 20:29:52 +00:00
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var low = BusRead(offset, page);
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var high = BusRead((byte)(offset + 1), page);
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2019-02-03 00:42:55 +00:00
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return MakeWord(low, high);
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2019-02-02 15:12:51 +00:00
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}
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2019-02-03 00:42:55 +00:00
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protected override ushort PopWord()
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{
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var low = Pop();
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var high = Pop();
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2019-02-03 00:42:55 +00:00
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return MakeWord(low, high);
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2019-02-02 15:12:51 +00:00
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}
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2019-02-03 00:42:55 +00:00
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protected override void PushWord(ushort value)
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{
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Push(HighByte(value));
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Push(LowByte(value));
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2019-02-02 15:12:51 +00:00
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}
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2019-02-03 00:42:55 +00:00
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protected override void SetWord(ushort value)
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{
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BusWrite(LowByte(value));
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++Bus.Address;
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BusWrite(HighByte(value));
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2019-02-02 15:12:51 +00:00
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}
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2019-02-03 00:42:55 +00:00
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protected override void SetWordPaged(byte page, byte offset, ushort value)
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{
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BusWrite(offset, page, LowByte(value));
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BusWrite((byte)(offset + 1), page, HighByte(value));
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2019-02-02 15:12:51 +00:00
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}
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}
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}
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