Crystallography Software
This software is a single user interactive package which teaches the principles of the atomic packing of spheres and shows how this is related to crystal structure.
It was originally marketed by the Institute of Materials, but they have now returned the copyright to the authors who make it available here for academic use. It must be copied complete and may not be sold or otherwise used for profit.
It was written in 1985 for the Acorn BBC Model B microcomputer, and has been adapted since for various other systems, including RISCOS systems and PC (DOS only).
Look in the Manual for further details to find out which of the 3 available versions you want: