Cambridge Systems Technology (CST) were a company formed in the early 1980s by ex-Torch Computers

Torch Computers

Torch Computers Ltd was a computer hardware company formed in 1982 in Great Shelford, near Cambridge, UK and became well known for its computer peripherals for the BBC Micro...

 engineers David Oliver and Martin Baines, to produce peripherals for the BBC Micro

BBC Micro

The BBC Microcomputer System, or BBC Micro, was a series of microcomputers and associated peripherals designed and built by Acorn Computers for the BBC Computer Literacy Project, operated by the British Broadcasting Corporation...

, and later, with Graham Priestley, Sinclair QL

Sinclair QL

The Sinclair QL , was a personal computer launched by Sinclair Research in 1984, as the successor to the Sinclair ZX Spectrum...

 microcomputers. Products included IEEE 488, floppy disk

Floppy disk

A floppy disk is a disk storage medium composed of a disk of thin and flexible magnetic storage medium, sealed in a rectangular plastic carrier lined with fabric that removes dust particles...

  and SCSI

SCSI

Small Computer System Interface is a set of standards for physically connecting and transferring data between computers and peripheral devices. The SCSI standards define commands, protocols, and electrical and optical interfaces. SCSI is most commonly used for hard disks and tape drives, but it...

 interfaces. Following the demise of the Sinclair QL in 1986, CST began producing the Thor

CST Thor

The CST Thor series of personal computers were Sinclair QL-compatible systems designed and produced by Cambridge Systems Technology during the late 1980s.- Thor PC :...

 series of QL-compatible personal computers. These had limited commercial success, and CST had ceased trading by the end of the decade.