Comart was the computer system group that took over the Byte Shop/Computerland chain when it had financial difficulties in the late 70s. They were a large company distributing North Star systems, and similar equipments. The Communicator was their first effort in distributing a British-made system.
The Communicator is a S-100 bus system based around a main chassis with a 10-slot-mother-board. The system had 64 KB of RAM and came with three variations of dual floppy disk drives.
Several S-100 boards were available. They offered Viewdata/Prestel capabilities, or 18.7 MB hard disk, with 13.4 MB cartridge backup.
The system ran CP/M operating system. A smaller system called the Educator, with networking facilities, was also available.
Chris Coggins adds:
The Communicator was upgraded over several years until the Communicator was given multi-user capability by running MP/M80 but finished off running Intel 386 processors with 512 KB RAM running CCP/M86. Hard disk had grown to 40MB Rodime drive.
David Broad sold Comart to Kode International and 2 years later it lefts it's Cambridgeshire factory and moved to Swindon. The Company went downhill, dropped the S-100 bus to use standard PC architecture but eventually closed.