So early IBM 360s and ICL 1900s count. PERQs count, just. I saw two in the Science Museum archive store about a couple of weeks ago. I think it will be some time before 486 PC clones count. Membership is open to anyone interested in computer conservation and the history of computing, and is currently free.
Members give their time voluntarilly.
In order to meet the objectives, the CCS carries out work in a number of areas. There are a number of working parties, each led by a chairman, and containing typically a dozen members who are prepared to give some time and effort, typically a half day every six weeks. Not quite so active, but has maintained in working order the also very important valve machine Pegasus, made by Ferranti Ltd from 1956 on. Not yet on display in the Museum. Charlie Portman Elliott 803 WP Small but active, have restored and maintain the Museum's Elliott 803 which was an early transistor machine.