Long before microchips and semiconductors, or PCs and MACs, there were vacuum tubes...
Sixty years ago this week, the US Army unveiled the Electronic Numerical Integrator and Computer or ENIAC. We've come a long, long way since.
The best quote in relation to the ENIAC is from Popular Mechanics in 1947:
"Where a calculator on the ENIAC is equipped with 18,000 vacuum tubes and weighs 30 tons, computers in the future may have only 1,000 vacuum tubes and perhaps weigh 1-1/2 tons."