protected override void ExecuteSpecialFunction2PostBusSource(MicroInstruction instruction)
{
TridentF2 tf2 = (TridentF2)instruction.F2;
switch (tf2)
{
case TridentF2.ReadKDTA:
//
// <-KDTA is actually MD<- (SF 6), repurposed to gate disk data onto the bus
// iff BS is None. Otherwise it behaves like a normal MD<-. We'll let
// the normal Task implementation handle the actual MD<- operation.
//
if (instruction.BS == BusSource.None)
{
// _busData at this point should be 0xffff. We could technically
// just directly assign the bits...
_busData &= _tridentController.KDTA;
}
break;
case TridentF2.STATUS:
_busData &= _tridentController.STATUS;
break;
case TridentF2.EMPTY:
_tridentController.WaitForEmpty();
break;
}
}
private static string DisassembleTridentSpecialFunction2(MicroInstruction instruction)
{
TridentF2 tf2 = (TridentF2)instruction.F2;
switch (tf2)
{
case TridentF2.EMPTY:
return("EMPTY ");
case TridentF2.KTAG:
return("KTAG<- ");
case TridentF2.ReadKDTA:
return("<-KDTA ");
case TridentF2.RESET:
return("RESET ");
case TridentF2.STATUS:
return("STATUS ");
case TridentF2.WAIT:
case TridentF2.WAIT2:
return("WAIT ");
case TridentF2.WriteKDTA:
return("KDTA<- ");
default:
return(String.Format("Trident F2 {0}", Conversion.ToOctal((int)tf2)));
}
}
protected override void ExecuteSpecialFunction2(MicroInstruction instruction)
{
TridentF2 tf2 = (TridentF2)instruction.F2;
switch (tf2)
{
case TridentF2.KTAG:
_tridentController.TagInstruction(_busData);
break;
case TridentF2.WriteKDTA:
_tridentController.KDTA = _busData;
break;
case TridentF2.WAIT:
case TridentF2.WAIT2:
// Identical to BLOCK
this.BlockTask();
break;
case TridentF2.RESET:
_tridentController.ControllerReset();
break;
case TridentF2.STATUS:
case TridentF2.EMPTY:
// Handled in PostBusSource override.
break;
default:
throw new InvalidOperationException(String.Format("Unhandled trident special function 2 {0}", tf2));
}
}