After much playing with the simulator I get the impression that the 4553 internal oscillator
takes up all the cpu time. Changing the external capacitor made no difference. The Picaxe program hangs on the first instruction which is "pause 1000", as it can never get to 1000!!
Single stepping gave the pause time as 0.999999 secs. I haven't tried any other cmos oscillator to see if the same thing happens.
Regards
Phil button