Max Burnet started the collection, pretty much as 'Da Massive' says. It expanded into a Digital Users' Group then those folk formed ACMS in 1994. Max bought the initial collection when he retired and many subsequent donations have been made to ACMS. So there are two collections managed in a somewhat overlapping and cooperative way. And yes, the lack of a secure store/museum means that quite a lot of the material is in members' homes awaiting space for proper organisation, documentation and display. Sigh. (I'm the current President of ACMS)