Jef, You may be interested in these files if you want to work with the Cochran code. simcochran.c is a simulator that now uses ptys so I can avoid having to use some serial port emulator. It's as easy as running: simcochran -e emc emc.tar.bz and cmdr.tar.bz are data files for use with simcochran and list. These include some incomplete dives. list.c is a program to list the dives from a memory file. This is handy for finding corrupt dives. list -c cmdr/memory -- John Van Ostrand At large on sabbatical