Ken Shirriff @righto.com · Mar 29 1 / 2
IBM's 4 Pi computers were built from simple TTL integrated circuits and used magnetic core memory for storage. The board below was round to fit inside a tactical missile, but most of the computers used standardized rectangular boards called "pages".
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The Space Shuttle used a more advanced System/4 Pi computer called the AP-101B. A separate computer, the I/O Processor, provided 24 data buses to all parts of the Shuttle. These boxes still used individual TTL chips and magnetic core memory.