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Reconstruction of EDSAC

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A major milestone in the reconstruction of EDSAC has been passed – some of the sub-systems of the computer have run continuously for one million cycles over the course of 20 minutes. These subsystems have been individually created in home workshops scattered across the country and now the task of integrating all the components is the focus of the team of volunteers.

The systems that have been shown to work together for a significant time include:

  • the main control unit, which incorporates the order (instruction) fetch and execute actions
  • memory access, including the coincidence unit and delay line recirculation
  • order decoding and recoding circuits
  • arithmetic and logic unit (ALU)
  • clock and digit pulse generation.

from The National Museum of Computing


A technical update on integrating the EDSAC reconstruction January 2018. One of a series of videos by David Allen of the reconstruction of EDSAC at The National Museum of Computing. The original EDSAC, first operational at Cambridge University in 1949, was the first general purpose stored program practical computer.




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