Examining circuit boards from the Space Shuttle's I/O Processor

# Summary The Space Shuttle's I/O Processor was a sophisticated multi-threaded computer that managed input/output operations between the main CPU and the Shuttle's 24 high-speed networks, implementing 25 virtual processors with two different instruction sets on a single physical processor. Engineers examined circuit cards from the IOP, including a network interface page (MIA adapter) that handled four network connections at 1 million bits per second and a microcode storage page that used programmable fuses to define processor instructions. The system's design prioritized redundancy and reliability, with multiple networks connecting the computers to critical flight systems like engines and displays.