ANITA Desk Calculators Using LSI Integrated Circuits
ANITA 1011 LSI

ANITA 1011 LSI - similar to 1000 LSI but with % and memory.

Power supply - AC mains.

Display is 10 digits, Nixie tubes.

4- function, uses RPN (Reverse Polish Notation).

Uses 5 integrated circuits by General Instrument Microelectronics (GIM) - the metal cans in the photographs below.

222 mm X 135 mm X 88 mm (9" x 5.5" x 3.5").

Made in England by Sumlock Anita Electronics Ltd, distributed by Sumlock Comptometer Ltd.

Introduced 1971^[1].

Price £250 GBP (about US$600).

There is an operating manual for this machine in the Operating Manuals & Leaflets section.

With the casing open to reveal the two circuit boards.  The Nixie-type numerical indicator tubes are at the top.  The 12-pin integrated circuits in cans are positioned in holes in the circuit boards.

The journal 'Electronic Design' reported^[2]:
"All the arithmetic and logic for Sumlock Comptometer's newly announced desk calculator have been squeezed into just five microcircuit chips.  Sumlock, a London-based calculator company, designed the metal-oxide microcircuits in collaboration with a team of engineers based at the Glenrothes (Scotland) facility of General Instruments Microelectronics.  Although a few three-chip calculators have been produced by American MOS manufacturers—mostly for Japanese calculator companies—the Sumlock design approach remains a novel and low-cost solution to design problems.  By multiplexing timing and control signals and keyed information onto a common bus, the pin count has been drastically reduced.  Sumlock engineers were able to use 11-lead TO-5 cans costing only a few cents."

 

Reference:

1. Management in Action, Feb 1971, p13.
2. Electronics Design, Feb 1971, p28.

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Text & photographs copyright © 2002 - 2023 Nigel Tout, except where noted otherwise.