 Bob Maxfield and Alan Foster were responsible for the design of the early processor chassis until Art Wellman from Sylvania was brought in to take the computers to their next level mechanically.Both half-ATR and full-ATR-sized chassis were developed for a wide array of defense applications.The 1602B and 2150 I/O boxes were developed and standardized expressly for the Army ILS program and were top sellers at the time.