Mentec International Ltd 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 repackaged 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 DEC J-11 PDP-11 processor chip set 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. Product range M70 The M70 was developed between 1982 and 1984. It was a quad Q-bus module based on the J-11 chipset incorporating onboard ECC DRAM, bootstrap EPROMs and 4 serial lines implemented using DEC DC319 DLART chips. M71 The M71 was a version of the M70 intended for process control. It provided for 1/4 or 1 M Byte of ECC DRAM, up to 1/2 MB of EPROM, lines (DC-319 DLARTs) and two parallel ports implemented using 8255 chips. It was initially designed by Mentec for use in its own Remote Terminal Units. M80 The M80 was a further development of the M70 but using parity memory and a slightly higher clock rate. It also introduced software configuration via the bootstrap which all but eliminated wire-wrap configuration. M90 This was effectively merely a clock tweaked version of the M80. M100 The M100, a redesign of the 11/93, was the last of Mentec's J-11 based processor boards. It ran the J-11 chipset at 19.66 MHz, and had four on-board serial ports, 1-4 MB of on-board memory, and an optional FPU. The M100 was a somewhat tidied up and faster re-design of the M90. Some late models incorporated a daughter card with a Xilinx part which replaced the DLARTs and implemented a FIFO to prevent overruns for OEM applications. A small number of late models also incorporated an SRAM daughter card which replaced the on-board DRAM. M11 The M11 was a microcoded implementation of the PDP-11 instruction set done from scratch, Mentec announced, describing it as a processor upgrade board replacement for the M100. It was based around two Texas Instruments TI8832 ALUs and a TI 8818 microsequencer. One of the ALUs was used as the processor ALU while the second was used