1951: Jay Forrester files a patent application for the matrix core memory.

Back when computers still weighed hundreds of pounds and were primarily used by the military, computer memory relied on cathode rays to retrieve information. But the Navy needed a faster computer that could run flight simulations in real time.

In stepped a team at the Massachusetts Institute of Technology. Led by professor Jay Forrester, the researchers developed a three-dimensional magnetic structure code-named Project Whirlwind.

The structure consisted of a plane made of wires and magnetic rings called cores. Each ring contained one bit of data. Every bit on the memory plane could be accessed with a single read-and-write cycle.

In short, magnetic core memory was the first random access memory that was practical, reliable and relatively high-speed. The time it took to request and retrieve information from memory was a microsecond — hundreds of thousands of times slower than memory today, but nonetheless a magnificent achievement in the 1950s.

"When we were working on this, in a million years we couldn't imagine what would happen with memory," said Bernard Widrow, who worked on Project Whirlwind with Forrester, in a 2009 interview with Edison Tech Center.

Forrester applied for a patent on his invention May 11, 1951. Project Whirlwind stayed active until 1959, though the technology was never used for a flight simulator.

Source: Today in Technology History; Edison Tech Center

Photo: Magnetic core memory removed from an Olympia 15-digit Nixie calculator.

Synx508/Flickr

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