Fascinating data about the Semi-Automatic Ground Environment system built by IBM in1957:
SAGE consisted of 20 or so Direction Centers, each of which was a
windowless, one-acre-large concrete cube (see below). Inside each DC were
two CPUs, each one measuring 7,500 sq ft and consisting of 60,000 vacuum
tubes, 175,000 diodes, 13,000 newfangled transistors, and 256KB of magnetic
core RAM, consuming a total of 3MW of power and weighing in at 250 tons.
Each CPU — only one operated at a time; the other was kept as a hot spare to
minimize downtime — was capable of executing 75,000 instructions per
second, which was enough to spit out tons of radar data to 150 CRT consoles.
Original title and link: A Walk Down the Memory Lane of Big Data: Inside IBM’s SAGE, the Largest Computer Ever Built ( ©myNoSQL)