Flight controllers at Nasa working out how to get the crippled Apollo 13 back to Earth.
Thirty years of Pokémon means 30 years of absolutely bizarre, confounding, and totally lovable little freaks populating our screens.
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Three microcode cycles for the writeback alone. That's acceptable because segment loads are already expensive multi-cycle operations, and the designers likely expected them to be infrequent -- most programs load their segments once at startup and never touch them again. Page translations happen on every memory access, so the same approach would be ruinous. Hence the fully autonomous hardware walker.