Hi Having had a look at the slides I now have it straight. It was the Alas I saw when at college and the ICL system when I worked just round the corner at RRD. If you had anything to do with Harwell RRD would have been familiar to you. I built experimental rigs and interfaced them to PDP-8's. The science guys would run them whilst the particular reactor (Dido or Pluto) was operating and I would do the maintenance whilst they where on shutdown. Happy Days... I had a office/workshop at one end of a hut with windows on three sides. Taxi to and from work each day and one week in three to a sandwich course. Rod -----Original Message----- From: cctech-bounces at classiccmp.org [mailto:cctech-bounces at classiccmp.org] On Behalf Of Roger Holmes Sent: 16 May 2007 23:28 To: cctalk at classiccmp.org Subject: Re: Harwell (was RE: A local computer history group for my area. ..) Maybe it had gone by then, but there are photos on the web of the building when it housed a Ferranti Atlas. Specifically: http://www.chilton-computing.org.uk/gallery/harwell/ slide8.htm or the view the whole collection of photos at http://www.chilton- computing.org.uk/gallery/home.htm What was involved in refurbishment? My 1301 has five core stores, each of 400(decimal) words x 50 bits (48 data + 2 parity). Three of the stores work perfectly after they have warmed up, but two of the stores are totally dead. We've tried everything, starting with the obvious - looking for a fault in the selection logic, but after replacing the same boards about five times with no effect (especially when the 'scope also says they're working properly), we had to started looking for a fault in each of the stores. But everything there looks OK too, at least measuring voltages they look OK, I don't possess a current probe and I'm not sure if I had one I'd be able to use it.