Anyone know the format of the data for the Inverse Assembler files for the HP1631D logic analyser - or how to write your own ? Rgds ~`:o) Mike Perth, Western Australia Products/Personal/Client web area at http://www.wantree.com.au/~erazmus (Current feature - trip to Malaysia to install equipment in jungle power site) Some say there is no magic but, all things begin with thought then it becomes academic, then some poor slob works out a practical way to implement all that theory, this is called Engineering - for most people another form of magic.