What were old computers made from?

Computers are made out of chips circuits and metal/plastic parts which magically make everything work.

Computers started out with simple binary function and simple equations. Think of it as a cheap calculator. They eventually made these simple on and off values....0 and 1 into more advanced things like text on a screen. Eventually, this is used in machines to control functions...maybe something simple like turn on a light. Finally, we have these highly advanced computers which can play games, music, animations, render, create, and innovate.