The Amstore from Northern Computers Ltd. (UK) is a 20MB hard disk for "all existing Amstrad computers" connected by a network.
Amstore was connected through an Amstrad network, a token-passing multi-user ring network. Amstrad network could be used with any Amstrad machine and with IBM PC, Apricot, BBC and Apple computers.
The Amstore Harddisk (and the Amstrad computers) are connected as a 'stations' to this network. There can be max 120 stations, max 3km apart.
Short review on File:ACU8512-078.jpg.