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Simplify i/o port handling in Z80 implementation

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This commit is contained in:
Adrian Conlon
2025-01-27 21:23:47 +00:00
parent a15cff4588
commit e8d770c6bb
1 changed files with 8 additions and 8 deletions
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16
Z80/Z80.cs
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@@ -785,7 +785,7 @@ namespace Z80
this.Bus.Address.Assign(this.BC);
this.MEMPTR.Assign(this.Bus.Address);
this.MEMPTR.Word++;
_ = this.ReadPort();
this.ReadPort();
if (y != 6)
{
this.R(y, AccessLevel.WriteOnly) = this.Bus.Data; // IN r[y],(C)
@@ -1443,7 +1443,8 @@ namespace Z80
this.WritePort(this.FetchByte());
break;
case 3: // IN A,(n)
this.A = this.ReadPort(this.FetchByte());
this.ReadPort(this.FetchByte());
this.A = this.Bus.Data;
break;
case 4: // EX (SP),HL
this.XHTL(this.HL2());
@@ -2018,7 +2019,7 @@ namespace Z80
this.Bus.Address.Assign(source);
this.MEMPTR.Assign(this.Bus.Address);
this.Tick();
_ = this.ReadPort();
this.ReadPort();
this.Tick(3);
this.MemoryWrite(destination);
source.High = this.Decrement(source.High);
@@ -2158,23 +2159,22 @@ namespace Z80
this.RaiseIORQ();
}
private byte ReadPort(byte port)
private void ReadPort(byte port)
{
this.Bus.Address.Assign(port, this.Bus.Data = this.A);
this.MEMPTR.Assign(this.Bus.Address);
++this.MEMPTR.Low;
return this.ReadPort();
this.ReadPort();
}
private byte ReadPort()
private void ReadPort()
{
this.Tick();
this.LowerIORQ();
this.LowerRD();
var returned = this.Bus.Data = this._ports.Read(this.Bus.Address.Low);
this.Bus.Data = this._ports.Read(this.Bus.Address.Low);
this.RaiseRD();
this.RaiseIORQ();
return returned;
}
}
}