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Rockwell 920, 930, or 940 Desktop Calculator

Rockwell 920

Rockwell 930

Rockwell 940 (Financial)
Image Courtesy Gerard Timmerman

Mid-1970's vintage programmable electronic calculators from Rockwell, using Rockwell's PPS-4 microprocessor and support chips. Models include 920, 930, 940, and 960. Burroughs Panaplex-II planar display and Epson reel-type printer. Magnetic card reader for program/data storage. 14-digit capacity with some models supporting scientific notation. Machines all share a common architecture, with variances in microcode and memory capacity comprising the differences between the models. Sold in the UK under the Sumlock Anita brand.