indeed... i replaced portb with portb.0 and it now seems to work...

I used a stopwatch to time the LED and it was slightly over... I timed it 10 times and each one came back within 0.1 second of the same value so i've worked out a preload for TMR1...

I'm going to have a play with your (DT's) instant interupts, i need to use interupts now coz i'm dealing with HS serial coms...


Thanks Darrel