History of personal computers - Wikipedia
https://en.wikipedia.org/wiki/History_of_personal_computersThe history of the personal computer as mass-market consumer electronic devices effectively began in 1977 with the introduction of microcomputers, although some mainframe and minicomputers had been applied as single-user systems much earlier. A personal computer is one intended for interactive individual use, as opposed to a mainframe computer where the end user's requests are filtered through operating staff, or a time sharing system in which one large proces…