From wikipedia:
"IBM first promoted the term "personal computer" to differentiate themselves from other microcomputers, often called "home computers", and also IBM's own mainframes and minicomputers. Unfortunately for IBM, the microcomputer itself was widely imitated, as well as the term.
My PET 2001-8K with mini keyboard from 1977 says "personal computer" on its front label. It was a term that was used often before IBM came out with their PC.
