I happened on the program by chance. It might have been called Disappearing Britain. A lot of it was contemporaneous and could have been a Lyons publicity film. (or at least bits of one). I suspect our friends at the National Film Archive might know. I inadvertently made an ambiguous statement. By commercial I meant its use, not its availability for sale. Where would you start to design such a thing? Valves yes.. 12AT7 Bistables as binary counters. Neon devices such as dekatrons as decimal counters. RVL (Resistor Valve Logic). Storage = Ferrite Cores, Tape, Drum possibly. I once saw a Univac FAST RAN Drum memory. What a lump!!! Rod -----Original Message----- From: cctech-bounces at classiccmp.org [mailto:cctech-bounces at classiccmp.org] On Behalf Of Jules Richardson Sent: 16 July 2007 22:45 To: On-Topic and Off-Topic Posts Subject: Re: LEO (1950) Rod Smallwood wrote: That wasn't the James May thing that aired last Tuesday was it? I think it was something along the lines of 'the history of science', and I wondered what they'd show for origins of the computer - sadly I wasn't around when the show was on though to see. 1950? Hmm, the Ferranti Mark 1 (based on the Manchester Baby) was a commercial machine and built around that same sort of time. I'm not sure if the Ferranti machine was the first to be sold to someone (rather than being used in-house) or whether the LEO was. (Actually, I'm not sure if LEO I was ever used outside of Lyons - I think it may have been the later LEO II that was their first true commercial machine) cheers Jules