Elektronika MK-41

© Sergei Frolov

© Sergei Frolov

MK-41 is the desktop variant of the C3-15. It is made by Svetlana. Back label dates this machine at 1985. It operates with 10+2 digits (really use 12 mantissa digits). Key /p/ is function of sqrt( x² + y² ).

The circular ICs, seen below, are a uniquely Russian design. Circular ICs are also present in the MK-51, and probably many other Russian calculators - a good, and very different, solution to the problem of fitting many pin-outs into a small package.

© Sergei Frolov Close-up of internals of MK-41, showing circular ICs.

© Sergei Frolov