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Work towards accurate bus/memory/io timings. Especially Z80 m-cycle timing.

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Signed-off-by: Adrian Conlon <adrian.conlon@gmail.com>
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Adrian Conlon
2020-07-05 00:09:51 +01:00
parent cd4af67177
commit 47ecdad3e8
11 changed files with 264 additions and 250 deletions
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30
EightBit/Processor.cs
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@@ -136,47 +136,51 @@ namespace EightBit
protected virtual void HandleINT() => this.RaiseINT();
protected void BusWrite(byte low, byte high, byte data)
protected void MemoryWrite(byte low, byte high, byte data)
{
this.Bus.Address.Low = low;
this.Bus.Address.High = high;
this.BusWrite(data);
this.MemoryWrite(data);
}
protected void BusWrite(ushort address, byte data)
protected void MemoryWrite(ushort address, byte data)
{
this.Bus.Address.Word = address;
this.BusWrite(data);
this.MemoryWrite(data);
}
protected void BusWrite(Register16 address, byte data) => this.BusWrite(address.Word, data);
protected void MemoryWrite(Register16 address, byte data) => this.MemoryWrite(address.Word, data);
protected void BusWrite(byte data)
protected void MemoryWrite(byte data)
{
this.Bus.Data = data;
this.BusWrite();
this.MemoryWrite();
}
protected virtual void MemoryWrite() => this.BusWrite();
protected virtual void BusWrite() => this.Bus.Write(); // N.B. Should be the only real call into the "Bus.Write" code.
protected byte BusRead(byte low, byte high)
protected byte MemoryRead(byte low, byte high)
{
this.Bus.Address.Low = low;
this.Bus.Address.High = high;
return this.BusRead();
return this.MemoryRead();
}
protected byte BusRead(ushort address)
protected byte MemoryRead(ushort address)
{
this.Bus.Address.Word = address;
return this.BusRead();
return this.MemoryRead();
}
protected byte BusRead(Register16 address) => this.BusRead(address.Word);
protected byte MemoryRead(Register16 address) => this.MemoryRead(address.Word);
protected virtual byte MemoryRead() => this.BusRead();
protected virtual byte BusRead() => this.Bus.Read(); // N.B. Should be the only real call into the "Bus.Read" code.
protected byte FetchByte() => this.BusRead(this.PC.Word++);
protected byte FetchByte() => this.MemoryRead(this.PC.Word++);
protected abstract Register16 GetWord();