Digital Equipment Corporation (USA) | 1,650 followers on LinkedIn. For those of us who worked at DEC, an entry in the LinkedIn company database that has the correct logo :) | Digital Equipment Corporation (DEC), using the trademark Digital, was a major American company in the computer industry from the 1950s to the 1990s. DEC was a leading vendor of computer systems, including computers, software, and peripherals. Their PDP and successor VAX products were the most successful of all minicomputers in terms of sales.