Computer veterans make a special visit to Milton Keynes

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Life working with one of the world’s first general purpose computers was brought vividly to life when EDSAC veterans visited The National Museum of Computing to see the latest stage of the reconstruction of the 1950’s Cambridge University computer.

The original computer was the first to enter service at a University and transformed research methods, contributing to at least three Nobel prizes. The historic machine is currently being reconstructed at The National Museum of Computing on Bletchley Park and is expected to be operational in 2017, almost seven decades after the original machine ran its first program.

The visiting EDSAC veterans – Joyce Wheeler, then an astronomy postgraduate student, and Margaret Marrs, an EDSAC operator – were very impressed at the authenticity of the reconstruction and gave the current EDSAC team valuable details about how they used it. They were joined by Liz Howe, an operator of EDSAC 2, who was able to speak of the people who worked in the Cambridge Mathematical Laboratory including staff and users.

Andrew Herbert, leader of the EDSAC Project, said: “In reconstructing EDSAC, photographs and some documentation have been available, but it has been essential for the team to get into the mindset of the original creators to be able to fill in many unrecorded details. Thankfully the EDSAC veterans have confirmed that the guesses that we’ve had to make have been correct.”

“The most fascinating aspect of their recollections is the social history of day-to-day working with an early computer. Strikingly, many women were computer operators and users back then, a balance that today’s computing industry is striving to re-establish.

“Working boundaries were obviously much more flexible then and we learned how the engineers worked very closely with the operators and users. But it was certainly tough for the first programmers - they really were thrown in at the deep end and had to teach themselves the new skill of programming.”

Researcher and programmer Joyce Wheeler recalled: “There were notes describing EDSAC and I remember going to the lab to read it all through and to do the exercises at the back. They were very important in learning how to program!”

The EDSAC Project is expected to be completed in 2017 and there are plans to enable students on the Museum’s Education programme to bring their prepared and debugged programmes which will be punched as EDSAC paper tapes and run on the machine.

The ongoing reconstruction can be seen by visitors to the Museum during public opening hours: www.tnmoc.org/visit