77 lines
2.3 KiB
C#
77 lines
2.3 KiB
C#
// <copyright file="BigEndianProcessor.cs" company="Adrian Conlon">
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// Copyright (c) Adrian Conlon. All rights reserved.
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// </copyright>
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namespace EightBit
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{
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public abstract class BigEndianProcessor : Processor
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{
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private readonly Register16 intermediate = new Register16();
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protected BigEndianProcessor(Bus memory)
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: base(memory)
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{
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}
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public override Register16 PeekWord(ushort address)
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{
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this.intermediate.High = this.Bus.Peek(address);
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this.intermediate.Low = this.Bus.Peek(++address);
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return this.intermediate;
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}
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public override void PokeWord(ushort address, Register16 value)
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{
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this.Bus.Poke(address, value.High);
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this.Bus.Poke(++address, value.Low);
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}
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protected override Register16 FetchWord()
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{
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this.intermediate.High = this.FetchByte();
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this.intermediate.Low = this.FetchByte();
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return this.intermediate;
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}
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protected override Register16 GetWord()
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{
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this.intermediate.High = this.MemoryRead();
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++this.Bus.Address.Word;
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this.intermediate.Low = this.MemoryRead();
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return this.intermediate;
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}
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protected override Register16 GetWordPaged(byte page, byte offset)
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{
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this.intermediate.High = this.MemoryRead(offset, page);
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this.intermediate.Low = this.MemoryRead(++offset, page);
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return this.intermediate;
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}
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protected override Register16 PopWord()
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{
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this.intermediate.High = this.Pop();
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this.intermediate.Low = this.Pop();
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return this.intermediate;
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}
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protected override void PushWord(Register16 value)
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{
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this.Push(value.Low);
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this.Push(value.High);
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}
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protected override void SetWord(Register16 value)
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{
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this.MemoryWrite(value.High);
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++this.Bus.Address.Word;
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this.MemoryWrite(value.Low);
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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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this.MemoryWrite(offset, page, value.High);
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this.MemoryWrite(++offset, page, value.Low);
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}
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}
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}
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