The beginning of the computer revolution is debated by many. Many say it began in the 1930s, others say in the '40s, and some say it didnt begin until the '50s. I believe that the computer revolution began in 1936 with the invention of the Z1 by Konrad Zuse. This was actually a mechanical calculator, but what I believe made this the beginning of the computer revolution is that this was the first calculator with memory. It was necessary for computers in long calculations to remember many answers. This was important in Zuse's field, construction engineering.
Obviously, computers have come very far since this primitive invention, but it is what sparked the computer revolution. Within ten years of that invention, the military was using the ENIAC, a computer 1000 times faster than any before it. The ENIAC could do 5,000 additions per second. This 1,800 square foot machine took a year and a half to develop and weighed 60,000 lbs.
These computers both took a huge part in the computer revolution. They started a great interest around the world in what can be done with these machines. Many countries wanted to make these computers as useful as possible. In the midst of World War II, many computers were made for militaries to help them do many complex computations so they could spend their time worrying about more important things. Computer technology has sky-rocketed exponentially ever since and more and more advancements were made every year.