http://www.retrotechnology.com/herbs_stuff/386intel/beech_logic.html I have a 1650B, and my Web site shows my colleague Bill Beech and his use of a 1650B on S-100 systems. He'll appreciate that Z80 disassembler, thanks. Herb -- Herbert R. Johnson, New Jersey USA http://www.retrotechnology.com OR .net preservation of 1970's computing email: hjohnson AAT retrotechnology DOTT com alternate: herbjohnson ATT retrotechnology DOTT info