Questions tagged [edsac]

For questions concerning EDSAC, the Electronic Delay Storage Automatic Calculator, built at Cambridge University between 1947 and 1949 and subsequently modified into the LEO I, the first computer deployed for commercial business processing.

Filter by
Sorted by
Tagged with
15
votes
4answers
663 views

Did any computers use automatically-operated mechanical storage as electronically-read-addressable memory

From what I understand of ENIAC, it had a very large number of manually-operated rotary switches which behaved as ROM. While programming ENIAC in the early days required a plugboard, the machine was ...
10
votes
1answer
971 views

Why did the EDSAC use mercury delay lines?

In this video about the EDSAC replica, he talks about the mercury delay lines which were used in the original EDSAC machine. They're unreliable, toxic, and relatively expensive. Delay lines can also ...
4
votes
1answer
122 views

How was EDSAC program code represented on uniselectors?

(I hope we haven't covered this somewhere...) The 1949 EDSAC could boot, as we say nowadays, from a bank of uniselectors. It's unclear to me how program code was actually represented on the ...