Pilot ACE

Pilot ACE
DeveloperNational Physical Laboratory (NPL)
Released1950 (1950)
CPUapproximately 800 vacuum tubes @ 1 megahertz
Memory128 32-bit words; later expanded to 352 words (Mercury delay lines)
The Pilot ACE, its console, and the ACE Simulator, as displayed at Science Museum London.
Pilot ACE console.
Punch cards, detail view against dark grey background, for Pilot ACE computer, built at the National Physical Laboratory (United Kingdom), circa 1950. Science Museum London

The Pilot ACE (Automatic Computing Engine) was one of the first computers built in the United Kingdom. Built at the National Physical Laboratory (NPL) in the early 1950s, it was one of the earliest general-purpose, stored-program computers – joining other UK designs like the Manchester Mark 1 and EDSAC of the same era. It was a preliminary version of the full ACE, which was designed by Alan Turing, who left NPL before construction of the Pilot ACE was completed.

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