Darrrel

Thanks for the reply.

Yes, my interrupt handler is in assembler.

I thought about putting the interrupt variables at the end of ram, but how can I protect them from getting overwritten by the PBP program if it gets that large?

Also, I'd like to use interrupts in my PBP program, possibly for another timer and for the UART. It's not necessary to be able to do it through ON INTERRUPT though. We can put in more assembler code, either in the interrupt handler or in the PBP program, as necessary.

More suggestions appreciated.

Joe