ANITA Desk Calculators Using LSI Integrated Circuits


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.

Inside ANITA 1011 LSI

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.

Nixie tube display of ANITA 1011 LSI

The "Nixie" tube display in use. (Caution if trying this since there are dangerous voltages exposed.)

Advertisement for ANITA1011 LSI

Advertisement from February 1971 announcing the new ANITA 1000 LSI and ANITA 1011 LSI calculators[1].

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."



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

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Text & photographs copyright © 2002 - 2022 Nigel Tout, except where noted otherwise.