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Some speed-up refactoring of the Z80 core

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This commit is contained in:
Adrian Conlon 2025-05-12 10:17:39 +01:00
parent 8331b4818e
commit e7b025e66e
1 changed files with 4 additions and 25 deletions
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29
Z80/Z80.cs
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@ -13,9 +13,6 @@ namespace Z80
{
this._ports = ports;
this.RaisedPOWER += this.Z80_RaisedPOWER;
this.RaisedRFSH += this.Z80_RaisedRFSH;
this.ExecutingInstruction += this.Z80_ExecutingInstruction;
this.ExecutedInstruction += this.Z80_ExecutedInstruction;
}
private readonly InputOutput _ports;
@ -66,16 +63,8 @@ namespace Z80
public Register16 IX { get; } = new(0xffff);
public byte IXH { get => this.IX.High; set => this.IX.High = value; }
public byte IXL { get => this.IX.Low; set => this.IX.Low = value; }
public Register16 IY { get; } = new(0xffff);
public byte IYH { get => this.IY.High; set => this.IY.High = value; }
public byte IYL { get => this.IY.Low; set => this.IY.Low = value; }
// ** From the Z80 CPU User Manual
// Memory Refresh(R) Register.The Z80 CPU contains a memory _refresh counter,
// enabling dynamic memories to be used with the same ease as static memories.Seven bits
@ -124,19 +113,11 @@ namespace Z80
}
}
private void Z80_ExecutingInstruction(object? sender, EventArgs e)
public override void PoweredStep()
{
this._modifiedF = 0;
this._displaced = this._prefixCB = this._prefixDD = this._prefixED = this._prefixFD = false;
}
private void Z80_ExecutedInstruction(object? sender, EventArgs e)
{
this.Q = this._modifiedF;
}
public override void PoweredStep()
{
if (this.RESET.Lowered())
{
this.HandleRESET();
@ -173,6 +154,8 @@ namespace Z80
// CPU.The HALT acknowledge signal is active during this time indicating that the processor
// is in the HALT state.
this.Execute(this.FetchInstruction());
this.Q = this._modifiedF;
}
private void Z80_RaisedPOWER(object? sender, EventArgs e)
@ -200,11 +183,6 @@ namespace Z80
this.ResetRegisterSet();
}
private void Z80_RaisedRFSH(object? sender, EventArgs e)
{
++this.REFRESH;
}
#region Z80 specific pins
#region NMI pin
@ -311,6 +289,7 @@ namespace Z80
{
RaisingRFSH?.Invoke(this, EventArgs.Empty);
this.RFSH.Raise();
++this.REFRESH;
RaisedRFSH?.Invoke(this, EventArgs.Empty);
}
}