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Start correcting timing issues in my Z80 implementation

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This commit is contained in:
Adrian Conlon
2025-05-02 12:11:54 +01:00
parent 07330cc9c8
commit 9670c3fd21
1 changed files with 9 additions and 7 deletions
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Z80/Z80.cs
+9 -7
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@@ -271,7 +271,6 @@ namespace Z80
{
RaisingM1?.Invoke(this, EventArgs.Empty);
this.M1.Raise();
++this.REFRESH;
RaisedM1?.Invoke(this, EventArgs.Empty);
}
}
@@ -314,6 +313,7 @@ namespace Z80
{
RaisingRFSH?.Invoke(this, EventArgs.Empty);
this.RFSH.Raise();
++this.REFRESH;
RaisedRFSH?.Invoke(this, EventArgs.Empty);
}
}
@@ -492,12 +492,15 @@ namespace Z80
protected override byte MemoryRead()
{
this.Tick();
this.LowerMREQ();
this.LowerRD();
this.Tick(3);
this.Tick();
var returned = base.MemoryRead();
this.RaiseRD();
this.RaiseMREQ();
if (this.M1.Raised())
this.Tick();
return returned;
}
@@ -1166,6 +1169,7 @@ namespace Z80
break;
case 1: // ADD HL,rp
this.HL2().Assign(this.Add(this.HL2(), this.RP(p)));
this.Tick(7);
break;
default:
throw new NotSupportedException("Invalid operation mode");
@@ -1255,7 +1259,7 @@ namespace Z80
default:
throw new NotSupportedException("Invalid operation mode");
}
this.Tick(2);
break;
case 4: // 8-bit INC
{
@@ -1266,7 +1270,6 @@ namespace Z80
}
var original = this.R(y);
this.Tick();
this.R(y, this.Increment(original));
break;
}
@@ -1280,7 +1283,6 @@ namespace Z80
}
var original = this.R(y);
this.Tick();
this.R(y, this.Decrement(original));
break;
}
@@ -1672,17 +1674,17 @@ namespace Z80
// instruction so that no other concurrent operation can be performed.
private byte ReadInitialOpCode()
{
this.Tick();
this.LowerM1();
var returned = this.MemoryRead(this.PC);
this.RaiseM1();
this.Bus.Address.Assign(this.REFRESH, this.IV);
this.LowerRFSH();
this.Tick();
this.LowerMREQ();
this.RaiseMREQ();
this.RaiseRFSH();
this.Tick();
return returned;
}