1979 -
Elektronika B3-26
Manufactured at Angstrem and Billur from 1977, the Elektronika B3-26 microcalculator was aimed at students in secondary and vocational technical schools.
The scale on the monitor: 1:1




The microcalculator can perform arithmetic operations, as well as square roots and percentages. It can memorise and store content in its RAM, and also handle number signs and point placements.
The Elektronika B3-26 was the first model to be built on the K145IP11 microcircuit, an innovation designed especially for microcalculators.

The B3-26 formed the basis for the B3-23 for percentages, the B3-23A for square rooting, and the B3-24G for memory.
There are two known modifications of this calculator, the B3-26 and B3-26A. Unlike the parent model, the latter sported a red LED display.

The microcalculator could run on either four AA batteries or a line adapter.

Weight: 300 g or less
Dimensions: 142×80×27.5 mm

Sources: V.I. Grubov, V.S. Kirdan, S.F. Kozubovsky PC Guide, 1989, p. 282, http://www.myadel-gimnaz.by/node/39, https://ru.wikipedia.org/wiki/%D0%AD%D0%BB%D0%B5%D0%BA%D1%82%D1%80%D0%BE%D0%BD%D0%B8%D0%BA%D0%B0_%D0%913-26, http://9zip.ru/starye_radiodetali/elektronika_b3_26.htm.