At 12:20 AM 3/27/01 -0800, you wrote: I don't know for sure but it will probably print something like "XROM xx,yy". That's what some of the other HPs do. xx will be an id number assigned to that ROM and yy will be the number of the routine in the ROM. XROM of courxe means eXternal ROM. XROM xx,yy is how HP usually encodes the call in memory. If the ROM is present then the routine name will be printed (or executed in the run mode) otherwise it prints the XROM message (or halts with an error and displays the XROM numbers in run mode). I have plenty of 9845 ROMs, I can probably loan you what you need. Joe