Hi,
The easiest way by far is to use Darrel's Instant Interrupt routine. It alows you to code your interrupt service routine in basic without the obvious drawbacks of ON INTERRUPT. It does have an effect on performace compared to true assembler interrupts but it is SO much easier to use. Look at:

http://www.picbasic.co.uk/forum/show...ant+interrupts

/Henrik Olsson.