AT&T Information Systems

AT&T Information Systems (ATTIS), originally known as American Bell, was the fully separate subsidiary of American Telephone & Telegraph Company (AT&T) which focused on computer technology ventures and telephone sales, and other unregulated business. It was one of the three core units of AT&T formed after the breakup of the Bell System. As a twenty-five percent owner, AT&T Information Systems utilized production of Olivetti to manufacture their AT&T PC 6300 series of computers. Along with the 3B series computers and the AT&T UNIX PC the PC 6300 series of computers represented a multi-faceted strategy of competing with IBM, who was the leading computer manufacturer of the time.