I just received this manual: Science Fair SF-5000 ELECTRONIC COMPUTER by Rolf Lohberg PROGRAMMING MANUAL and Assembly Instructions Engineered For Science Fair Electronics - A Tandy Corporation Company Copyright 1971 by FRANCKH'SCHE VERLAGSHANDLUNG. KOSMOS Stuttgart, West Germany I had all but forgotten these things - in fact when they guy who gave it to me described it over the phone, I could not place it - but when I saw the picture on the cover I recognized it. This is the Radio Shack version of the Kosmos "Logikus". It is a small flat device with ten multi-position slider switches which move in and out of the front. At the back is a raised panel with ten lights which can illuminate various cards that you slide into the front of the panel. Along the top (in front of the panel) are many holes in which you insert wires to "program" the device. My making connections between the various switch elements and the lights, you can demonstrate fundamental logic concepts such as AND and OR. The manual includes a number of simple games and some basic mathmatical functions - it consists of 112 pages + covers. Aa timer permits, I will scan it an post it to my site. Regards, -- dave04a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Vintage computing equipment collector. http://www.parse.com/~ddunfield/museum/index.html