Hi, Two years ago I've found scans in PDF with the article (dated 197?, I don't remember) describing DIY TTL-based calculator. This was microprogrammed machine (if I remember correctly microproprogram was "stored" in the diode array). It has LED display and possiblity to calculate square root. Definitely not talking about EDUC-8 computer from 1975. I think this calculator was published a little bit earlier. Unfortunately I'm no longer able to find it. Does anyone associate the name of that magazine? Regards, Jacek