Scisys sold many chess computers in the UK under the marketing company name Acetronic.  The Acetronic name was already well known in connection with video games. It made and marketed video games consoles which played games like Pong and Tank Battle from the late 1970s onwards. The majority of Mini Chess games were sold in Acetronic sets with the pieces and board. To the left are the three most common versions of Mini Chess I have come across, Schach Computer (SciSys - Germany), Electronic Chess (Acetronic - UK) and Pocket Chess (AudioSonic - Netherlands). They have the same electronics and chess program.