Hello, I'll be running a 17C43 in extended microcontroller mode with external program ram at 8000h. Seem like I need to use _MAXRAM to tell MPASM that memory is valid out there. But... I can't get the _MAXRAM directive to accept an argument of any size. I'm running MPASM v1.40 which is the latest on the bbs. Anyone out there successfully used _MAXRAM? What did your source line look like? Brian Leger bleger@harris.com