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Rockwell 920

Rockwell 920


Distinctive features: "Designed to be easily programmable in a business office or scientific laboratory".  Programs saved on magnetic cards.

Capabilities: 4 function, limited scientific, programmable, magnetic card reader.

Designed to be easily programmable in a business office or scientific laboratory, with conditional jumps, symbolic addressing, memory indirect addressing, subroutine nesting to 4 levels, and simple debugging and editing.
Each magnetic card can store 256 program steps on each side, and can also be used for storing data.  Rockwell had an extensive library of programs available on magnetic cards that they could supply.

Display: 14 digits, amber gas discharge and printer.

Technolgy: Large Scale Integration (LSI) ICs, here date coded to early 1975, comprising:
Rockwell A0577PA, A0578PB, A0579PB, A0580PB, A0581PA, 10696PA, 4x 10432PD, 3x 10432PC, 10660PD, Motorola MC14515CP.

Size: 297 mm x 425 mm x 155 mm (12" x 17" x 6.25"), 8.25 Kg (18.25 lbs).

Rockwell International
Business Equipment Division/Sunnyvale California.
Assembled in Mexico, US, and Foreign Parts.
[Distributed in the UK. by Sumlock Anita Ltd.]

Significance: A large calculator with a lot of integrated circuits, which were required at this time for the memories, the card reader, and the printer.

Rockwell 920 card reader

Rockwell 920 with a magnetic card about to be read.

Rockwell 920 with cover removed

Rockwell 920 with cover removed.

Inside Rockwell 920

With the cover and keyboard removed, showing most of the Rockwell integrated circuits, the display at top left, and the magnetic card reader at top right.

Vintage Calculators

© Text & photographs copyright Nigel Tout   2000-2019  except where noted otherwise.