Mentec Limited was founded in 1978 and initially focused on the development of monitoring and control software and systems. It was a significant Digital Equipment Corporation (DEC) reseller and OEM in Ireland. Mentec Computer Systems Limited was a subsidiary of Mentec Limited that developed PDP-11 processors. Mentec Inc. was a US-based subsidiary of Mentec Limited. In the early 1980s it had a range of remote terminal units based on the SBC/11-21 (Falcon).
Once the J11 chip became available in 1982 Mentec commenced the design of its first PDP-11 single board computer the M70. In 1994 Digital transferred the PDP-11 operating systems to Mentec Inc.