Whirlwind
An MIT computer that ran in real time, pioneered magnetic-core memory and became the basis of the SAGE air defense system.
Whirlwind began at MIT in 1944 as a flight-simulator project and became a general digital computer under Jay Forrester. It first ran in 1951. Unlike many machines of its day it worked in real time, answering inputs fast enough to track moving aircraft on a display.
Its original electrostatic memory tubes were unreliable. The team replaced them with magnetic-core memory in 1953, which was faster and far more dependable. The Whirlwind work moved to Lincoln Laboratory and shaped the SAGE air defense computers.
Why it matters
Whirlwind introduced real-time interaction and core memory, two ideas that reached almost every computer built in the next two decades. Its graphic displays and light pen were early steps toward interactive computing.
Key facts
- First operational in 1951.
- Used about 5,000 vacuum tubes.
- Magnetic-core memory was installed in 1953 and doubled the machine's speed.
- Led by Jay Forrester at MIT.
Sources
- Campbell-Kelly, Martin, and William Aspray, et al. Computer: A History of the Information Machine. 3rd ed. Westview Press, 2013.
- Redmond, Kent C., and Thomas M. Smith. Project Whirlwind: The History of a Pioneer Computer. Digital Press, 1980.
- Computer History Museum online collection catalog (computerhistory.org/collections).