There were computers, though few in number, which exist as machines that require 24K sq ft of raised floor to sit on and huge water chilling machines on the outside of the building, do not have anywhere near the computing power of an iPhone. They cost millions of dollars each and cost 10s of thousands of dollars each month to operate. Operating a computer, or working in IT is a blue-collar job. It is very rare to find someone who programs computers. The computers, though solid-state are built with “discrete” components and have metallic “core” memories bytes measured in the thousands to up to 4 megabytes in the biggest of the giant machines. Visitors from the future might be mesmerized by the blinking lights of the Juneteenth Raised Fists shirt of a mainframe computer like the IBM 360 Model 75, circa 1967 in the picture above.