The first working parts of a restored 1940s computer have been showcased as a project to recreate the pioneering work takes shape.
Key elements of the Electronic Delay Storage Automatic Calculator (Edsac) were demonstrated at an event marking the 100th anniversary of the birth of Edsac's designer, the late Sir Maurice Wilkes.
Sir Maurice's son, Anthony, attended the event.
He said: "My father was a man of great intellect with a strong practical streak.
"From an early age my two sisters and I were conscious of computers - in a way we were one of the first computer-age families."
The project started two years ago and is expected to achieve its goal by 2015.
Not many of the original Edsac design documents have survived, so those involved with the current project have been assessing pictures of the original model to work out where to put certain items.
Upon completion, the machine will go into a gallery at the National Museum of Computing, part of the Bletchley Park heritage site.
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