29th October 2015. Les Ferguy and Peter Haworth tuning and debugging memory units.
31st July 2015 - The maze of inter-chassis wiring is well under way
Sept 2015 - The racks are filling steadily
You can also see some of the inter-rack wiring at high level.
June 2015 - The arithmetic unit under test.
Nigel Bennee is building this important sub-system in his lab near Cambridge. We're still making good use of the "Imitation Game" racks!
26th November 2014. Prototype memory storage unit (delay line). We're using wire (the next generation of storage) rather than mercury (too dangerous to handle, and we would have needed 1/3 of a tonne!)
Nov 2014 - Gallery official opening at TNMoC, Bletchley Park
Left - Hermann Hauser, principal funder, Chris Burton, chief engineer. Right - Andrew Herbert, project manager.
Aug 2014 - The team seems happy with progress.
27th August 2014. Looking more complete by the day.
"Have you heard the one about the red valve and the silver valve?" Chris Smith and Chris Burton.
May 2014 - The team inspect progress...
The guy behind the oscilliscope is David Allen, who produced the BBC series that brought computing to the masses in the 1980s
Ten racks done
... and even more electronics in place. Might this thing work one day?
Six racks done
And two happy volunteers; Andrew Herbert and Peter Haworth
Three more racks in place, and some chassis in their final positions
Feb 2014 - It starts to get real!
The first two racks (out of 12) are in place.
Jan 2014 - The new gallery at Bletchley Park takes shape.
It's housed in a hut that was home to two Colossus code-breaking machines in WW2.
Did you see the movie "The Imitation Game"? It "starred" our EDSAC racks as part of Alan Turing's (supposedly) home-built computer!
29th October 2013. A surviving original memory unit and a recreated one. Note how tiny today's components are by comparison to those of the 1950s.
17th August 2013. A treasure trove! A generous member of the British Vintage Wireless Society allowed up to raid his cache of WW2-vintage cathode ray tubes ... stored in a horsebox!
July 2013 - Chassis in storage
The first 10 completed chassis, in storage in the prototype rack
18th March 2013. First small batch of assembled and wired chassis.
18th March 2013. First prototype memory unit on display at the project meeting
4th March 2013. Andrew Herbert, project manager, with the first assembled rack and the first chassis in his shed. It fits!
9th October 2012. First memory unit metalwork, plus Alan Clarke's Burmese cat who refused to move!
Original memory unit (Chassis 01)
The only part of the original EDSAC which still exists!
EDSAC, Early 1950s.
Copyright Cambridge University