Desk Electronic Calculators

Home > Desk Electronic Calculators

Anita 1011

ANITA 1011

ANITA 1011

Power supply - AC mains.

Display is 10 digits, Nixie tubes.

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

Mainly uses transistors, but has 5 integrated circuits made by Marconi-Elliott Microelectronics using "MOST" (Metal-Oxide Semiconductor Transistor) technology.

265 x 335 x 172 mm (10.4" x 13.25" x 6.75").

Introduced 1969, circuit boards on this example date stamped mid-1970.

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


Marconi-Elliot Microelectronics was closed down in July 1971 by GEC (the British General Electric Company) during one of the periodic industry downturns.
The whole of the British commodity semiconductor industry was to meet a similar fate.

For more information on the ANITA family of calculators click here go to the associated ANITA Calculator site.


The ANITA 1011 uses Reverse Polish Notation (RPN) where the operator is pressed after the number it is to use (eg. 6 X= gives Times by 6). After claring the display and inputting the digits of the first number, the "ENTER 1ST NUMBER" key is pressed.

Inside ANITA 1011

Inside the 1011, with from left to right the function boards, the memory board, the logic driver boards, and the display tubes.

Inside ANITA 1011

Inside the 1011 looking from the front, with the vertical memory board and, horizontally, the top one of the function boards.

Inside ANITA 1011

Inside the 1011 from the rear, showing the 11 function boards marked eg. "Bistable", "Add/Subtract", "Divide logic", "Multiply logic".

Circuit boards with ICs

The 3 logic driver boards, from top to bottom "Inst. Counter", "Sync. Counters", "Data Strobe".

These have the 5 integrated circuits - in metal cans mounted upside down with the leads coming out radially.

John Wolff in his Web Museum has interesting photographs of a 1011 with earlier types of circuit boards and components.

Sales brochure for the ANITA 1011 (pdf format, courtesy of Matthew Mawson).

Vintage Calculators

Text & photographs copyright, except where stated otherwise, © Nigel Tout 2000-2024.