BESM

BESM (БЭСМ) is the series of Soviet mainframe computers built in 1950–60s.

The name is an acronym for "Bolshaya[1] (or Bystrodeystvuyushchaya) [2] Elektronno-schotnaya Mashina" ("Большая электронно-счётная машина" or "Быстродействующая электронно-счётная машина"), meaning "Big Electronic Computing Machine" or "High-Speed Electronic Computing Machine".

It was designed at the Institute of Precision Mechanics and Computer Engineering The BESM series included six models.

The energy consumption was approximately 30 kW, not accounting for the cooling systems.

[7] EPSILON (a macro language with high-level features including strings and lists, developed by Andrey Ershov at Novosibirsk in 1967) was used to implement ALGOL 68 on the M-220.