 True electronic bulletin board systems arrived with the Computer Bulletin Board System in Chicago, which first came online on February 16, 1978.Before long, most major cities had more than one BBS running on TRS-80, Apple II, Atari, IBM PC, Commodore 64, Sinclair, and similar personal computers.The IBM PC was introduced in 1981, and subsequent models of both Mac computers and PCs were used throughout the 1980s.