Sounds like you are doing nothing wrong. Each new release of sdb has a couple more commands that work. Maybe someday more than half will. :-) My favorite is single step 10 instructions: s10 symbol not found -- Phil Hughes, SSC, Inc. P.O. Box 55549, Seattle, WA 98155 (206)FOR-UNIX amc-gw!ssc!fyl or uunet!pilchuck!ssc!fyl or attmail!ssc!fyl