SPEEDAC explained

SPEEDAC, the SPErry Electronic Digital Automatic Computer, was an early digital computer built by Sperry Corporation in 1953.^[1]

It used 800 vacuum tubes and had magnetic drum storage of 4096 18-bit words.^{[1] [2]}

Notes and References

1. Herbert Freeman, Cobblestones: The Story of My Life, p. 39
2. The SPEEDAC . Digital Computer Newsletter . 7 . 1 . 8 . Office of Naval Research - Physical Science Division . January 1955.