RM Nimbus PC-186: 2 x TOSEC

"RM was one of the first suppliers of computer networks in the UK and, working with Zilog, developed Z-Net, a low-cost network technology that was widely used in UK schools particularly the RM Nimbus model. Z-Net was subsequently replaced by the industry standard, Ethernet. Various generations of RM’s networking products – all of which have been built on standard Microsoft networking software –