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More IO simplifications

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This commit is contained in:
Adrian Conlon
2025-05-06 22:51:30 +01:00
parent 62f42ef46f
commit a6051a64ab
1 changed files with 17 additions and 10 deletions
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27
Z80/Z80.cs
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@ -928,11 +928,8 @@ namespace Z80
this.ClearBit(StatusBits.NF | StatusBits.HC);
break;
case 1: // Output to port with 16-bit address
this.Bus.Address.Assign(this.BC);
this.MEMPTR.Assign(this.Bus.Address);
this.WritePort(this.BC, y == 6 ? (byte)0 : this.R(y));
this.MEMPTR.Word++;
this.Bus.Data = y != 6 ? this.R(y) : (byte)0;
this.WritePort();
break;
case 2: // 16-bit add/subtract with carry
this.HL2().Assign(q switch
@ -2225,9 +2222,7 @@ namespace Z80
this.Tick();
_ = this.MemoryRead(this.HL);
this.B = this.Decrement(this.B);
this.Bus.Address.Assign(this.BC);
this.MEMPTR.Assign(this.Bus.Address);
this.WritePort();
this.WritePort(this.BC);
}
#region Block output single
@ -2333,17 +2328,29 @@ namespace Z80
private void WritePort(byte port)
{
this.Bus.Address.Assign(port, this.Bus.Data = this.A);
this.MEMPTR.Assign(this.Bus.Address);
this.WritePort();
++this.MEMPTR.Low;
}
private void WritePort(Register16 port, byte data)
{
this.Bus.Data = data;
this.WritePort(port);
}
private void WritePort(Register16 port)
{
this.Bus.Address.Assign(port);
this.WritePort();
}
private void WritePort()
{
this.MEMPTR.Assign(this.Bus.Address);
this.Tick(2);
this.LowerIORQ();
this.LowerWR();
this._ports.Write(this.Bus.Address.Low, this.Bus.Data);
this.Ports.Write(this.Bus.Address.Low, this.Bus.Data);
this.Tick();
this.RaiseWR();
this.RaiseIORQ();
@ -2363,7 +2370,7 @@ namespace Z80
this.Tick(2);
this.LowerIORQ();
this.LowerRD();
this.Bus.Data = this._ports.Read(this.Bus.Address.Low);
this.Bus.Data = this.Ports.Read(this.Bus.Address.Low);
this.Tick();
this.RaiseRD();
this.RaiseIORQ();