AT&T Information Systems (also known as AT&T IS) was a division of AT&T that was responsible for developing and marketing information technology products and services. The division was active in the 1980s and 1990s, and it played a key role in the development of the internet and the growth of the personal computer market.
AT&T IS was known for its work in developing networking and communication technologies, as well as for its work in the areas of software and hardware development. The division was responsible for the development of a number of important products, including the AT&T 3B2 computer, the AT&T Network Systems, and the AT&T Unix System V operating system.
AT&T IS was eventually dissolved as a standalone division, with its various products and services being integrated into other parts of the company.