The first computers were mechanical devices, The first electronic computer was invented in 1937, Vacuum tubes were used in early computers, ENIAC was the first general-purpose electronic computer, ENIAC weighed 27 tons, stood 10ft tall, and took up 1800 square feet of space.
My Dad used to fix televisions as a side things. We used to check vacuum tubes all the time. We had to plug them in and scroll until we found that vacuum tube. I don't remember much after that.
