< I don't think a Cincinati Millicron would hardly be considered a <"Personal Computer" no matter what the number of owners. That specific machine was about the same size as a PDP-8e and about 60 pounds. For that era that was very compact and light. But personal it was as at that time it resided in my bedroom while I was trying to write some simple code via asr33/ptape. < The 5100 was IBM's first "Personal Computer" (their words). It had <BASIC or APL or both! The HP system predated it but, I may have the number wrong. It was programmed in industrial BASIC. Allison