acted as a sort of network switch—the host computer identified the 3770's
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.
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Israel launches attack on Iran
Inputs: two integers in [0, 9,999,999,999]