Main Page | See live article | Alphabetical index The ORDVAC or Ordnance Discrete Variable Automatic Computer, an early computer built by the University of Illinois for the Ballistic Research Laboratory at Aberdeen Proving Ground, was based on the Institute for Advanced Study (IAS) architecture developed by John von Neumann. As with all computers of its era, it was a one of a kind machine that could not exchange programs with other computers (even other IAS machines). This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.