Strange Behavior in setting several pin outputs states.

[rmteo]

You can do it even faster by doing it the way Charles originally showed you, (did you REALLY try that and it didn't work?) in other words:

ShadowC VAR BYTE
ShadowC = PortC

ShadowC.0=1
ShadowC.1=1
ShadowC.2=1
ShadowC.3=1

PortC = ShadowC

/Henrik.

Even faster would be this way - but obviously the OP did not try it the way Charles described.

ShadowC VAR BYTE
ShadowC = PortC

ShadowC.0 = $F

PortC = ShadowC