Sumlock Anita Calculators

Desktop Calculators

Anita 1000 LSI

The image on the right is an Anita 1000 LSI desktop calculator. Clicking on it provides access to the simulator. It is a basic four function calculator and lacks a memory (available in the 1011 LSI mode). It works in a reverse-polish manner. I.e. key in a number, press 'Enter 1st No', key in a second number and press one of the four function keys.

The 'LSI' range of calculators were Sumlock Anita's foray into large scale integrated circuits (from General Instruments Microelectronics). The units were smaller and more stylish than the previous transistor based models, though the displays still used 'nixie' tubes. The Anita 1000 LSI dates from around 1971.

A 'readme' file for the simulator is available here, and Anita 1000 LSI instructions can be found at Nigel Tout's Anita site here.

Handheld Calculators

The handheld calculator range dates from about 1973. By now, Sumlock Anita was using single chip solutions from Rockwell, which, along with the LED displays, made these small units possible.

Sumlock Anita

The images below provide access to the Anita 811/810 calculator simulator. The Anita 811 also has three other 'skins' to choose from, showing variants made for the German company Triumph-Adler.

The Anita 811 (like the Anita 810 before it) behaves like a desktop calculator, where the "+" key is prime, and the "=" key is for multiply and divide. So, for instance to add 3 and 5 the sequence is "3+5+". Subtraction is similar: 3 minus 5 is "3+5-". To multiply and add, for example 2 times 4 plus 6, the sequence would be "2*4=+6+". Try this out for yourself on one of the calculators (click on an image).

Anita 810 Anita 811 Adler 81 #1 Adler 81 #2 Triumph 81

A 'readme' file for the 811 simulator (and variants) is available here. The manual has been scanned in and uploaded to the manuals page.

Anita 831
Shown here is a model for the Anita 831. The functionality has evolved from the 811, where the use of the equals key is more modern. The rounding switch is retained, and an interesting 'implied' two decimal point switch (far right) has replaced the memory switch. A square root function has also been added, and the memory functions enhanced, so that you can add, substract, clear and recall from memory ('m' followed by '+', '-', 'c' or '=').

A manual for the 831 can be found on Nigel Tout's site here. Access the model's 'readme' file can be obtained by clicking here.

Anita 841
The image on the right is the Anita 841. This later model is much richer than any of the previous calculators with a set of logarithmic and trigonomic functions, as well as enhanced memory manipulation features. It does not have a exponent however, and the range is still limited to +/- 99999999. The trig functions work in either radians or degrees as selected by the righthand switch. This is much more like a modern calculator than the others---No more the rounding or automatic decimal place switches.

A manual for the 841 can be found on Nigel Tout's site here. Access to the simulator's 'readme' file can be obtained by clicking here.

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Last updated 3rd November 2004.

© 2003-2004 Simon Southwell. All rights reserved.