Dr Iain Maoileoin wrote: Hi, It's Saratov, not Capatob (Cyrillic). Since it was made by Russians during the Soviet period, there's no wonder you can't find any documentation regarding it. It was made by CIME -- Central Institute of Measuring Equipment. The company is alive to this day, you can visit the website (in Russian) -- http://www.cime.ru/ or contact them at cime at cime dot ru, maybe you'll have some luck. There's a thread (in Russian) about it: http://www.nedopc.org/forum/viewtopic.php?t=9778 From there I can see that it has FOCAL, Fotran, and assemblers, just like the PDP. On front in the center there are five lights that indicate the step counter. Saratov is a city on Volga where CIME is located -- https://en.wikipedia.org/wiki/Saratov -- caóc