mirror of
https://github.com/MoleskiCoder/EightBitNet.git
synced 2024-09-08 15:54:54 +00:00
84 lines
2.3 KiB
C#
84 lines
2.3 KiB
C#
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using System;
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namespace EightBit
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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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public override Register16 PeekWord(Register16 address)
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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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return new Register16(low, high);
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}
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public override void PokeWord(Register16 address, Register16 value)
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{
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if (value == null)
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throw new ArgumentNullException(nameof(value));
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Bus.Poke(address, value.Low);
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Bus.Poke(++address, value.High);
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}
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protected override Register16 FetchWord()
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{
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var low = FetchByte();
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var high = FetchByte();
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return new Register16(low, high);
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}
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protected override Register16 GetWord()
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{
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var low = BusRead();
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++Bus.Address.Word;
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var high = BusRead();
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return new Register16(low, high);
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}
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protected override Register16 GetWordPaged(byte page, byte offset)
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{
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var low = GetBytePaged(page, offset);
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++Bus.Address.Low;
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var high = BusRead();
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return new Register16(low, high);
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}
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protected override Register16 PopWord()
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{
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var low = Pop();
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var high = Pop();
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return new Register16(low, high);
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}
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protected override void PushWord(Register16 value)
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{
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if (value == null)
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throw new ArgumentNullException(nameof(value));
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Push(value.High);
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Push(value.Low);
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}
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protected override void SetWord(Register16 value)
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{
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if (value == null)
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throw new ArgumentNullException(nameof(value));
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BusWrite(value.Low);
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++Bus.Address.Word;
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BusWrite(value.High);
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}
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protected override void SetWordPaged(byte page, byte offset, Register16 value)
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{
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if (value == null)
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throw new ArgumentNullException(nameof(value));
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SetBytePaged(page, offset, value.Low);
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++Bus.Address.Low;
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BusWrite(value.High);
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}
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}
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}
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