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Fuse fixes: Correct bus read/write order of XHTL

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Signed-off-by: Adrian Conlon <Adrian.conlon@gmail.com>
This commit is contained in:
Adrian Conlon
2019-08-15 14:31:23 +01:00
parent 84284d62b5
commit e35dabd130
2 changed files with 19 additions and 17 deletions
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Z80/Z80.cs
+9 -10
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@@ -1269,7 +1269,7 @@ namespace EightBit
this.Tick(11);
break;
case 4: // EX (SP),HL
this.XHTL();
this.XHTL(this.HL2());
this.Tick(19);
break;
case 5: // EX DE,HL
@@ -1788,19 +1788,18 @@ namespace EightBit
this.F = AdjustXY(this.F, this.A = (byte)~this.A);
}
private void XHTL()
private void XHTL(Register16 exchange)
{
var hl2 = this.HL2();
this.Bus.Address.Word = this.SP.Word;
this.MEMPTR.Low = this.BusRead();
this.Bus.Data = hl2.Low;
this.BusWrite();
hl2.Low = this.MEMPTR.Low;
this.MEMPTR.Low = this.BusRead(this.SP.Word);
++this.Bus.Address.Word;
this.MEMPTR.High = this.BusRead();
this.Bus.Data = hl2.High;
this.Bus.Data = exchange.High;
this.BusWrite();
hl2.High = this.MEMPTR.High;
exchange.High = this.MEMPTR.High;
--this.Bus.Address.Word;
this.Bus.Data = exchange.Low;
this.BusWrite();
exchange.Low = this.MEMPTR.Low;
}
private void BlockCompare(ushort source, ushort counter)