Greg,
Just had a chance to try out your suggestions - it works! (iepin 10 is now high...at this stage, I can't be sure which one of those tips you gave was the one that nailed it, becuase I used them all!)
Some excellent ideas you've given there too about my main program ...in fact, I reckon I've enough sufficient info get this little program sorted now.
Many thanks to all who took the time to help me out....the internet working at its finest.
mackrackit...it was very late, & I'd just quickly googled my problem (as I always do when I have a problem & as a beginner, a search engine often serves me better as I can phrase a question when I'm not totally sure of what I'm asking!)...Google led me to that online PICbasic book & I took it at face value!
Lesson learned.
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