SDB was obtained from the CNODE bulletin board at 617-470-2548 in Amherst, Mass. It was converted to the IBM PC using the Lattice C Compiler. To try some other compiler or system, see comments and settings in the front of SDBIO.H and things in PCJUNK.C. David N. Smith 44 Ole Musket Lane Danbury, CT 06810 24 January 1984