 DYSEAC van No. 1 | |
| Manufacturer | National Bureau of Standards for the U.S. Army Signal Corps |
|---|---|
| Generation | 1 |
| Released | April 1954 |
| CPU | 900 vacuum tubes and 24,500 crystal diodes |
| Memory | 512 words of 45 bits each (plus 1 parity bit) (mercury delay-line memory) |
| Weight | 20 short tons (18 t) |
| Predecessor | SEAC |
DYSEAC was the second Standards Electronic Automatic Computer. (See SEAC.)
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DYSEAC was a first-generation computer built by the National Bureau of Standards for the U.S. Army Signal Corps. It was housed in a truck, making it one of the first movable computers (perhaps the first). It went into operation in April 1954. [1]
DYSEAC used 900 vacuum tubes and 24,500 crystal diodes. It had a memory of 512 words of 45 bits each (plus one parity bit), using mercury delay-line memory. Memory access time was 48–384 microseconds. The addition time was 48 microseconds, and the multiplication/division time was 2112 microseconds. These times are excluding the memory-access time, which added up to approximately 1500 microseconds to those times.
DYSEAC may have been the first computer to implement interrupts for I/O. [1]
DYSEAC weighed about 20 short tons (18 t). [2]