This portion of the Whirlwind I computer (1945) looks similar to some of the more ancient personal computer circuitboards. Whirlwind was one of the first real attempts to build an electronic digital computer, rather than analog. The difference is that digital computers use 1/0 to encode numbers, whereas analog computers used voltages or other mechanisms to directly represent numbers. Whirlwind was designed to be an aircraft simulator, and used magnetic core memory.
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