The size and speed of computers has

The size and speed of computers has changed dramatically since the development of the first general purpose electronic digital computer, the ENIAC, built in 1946, the massive computer could perform about 5,000 additions and 1,000 multiplications per second. Early computers like the ENIAC use bulky unreliable vacuum tubes. The invention of the transistor in 1947 led to the production of faster, smaller and more reliable electronic computers. Development of the integrated circuit in the early 1960s continue the miniaturization process, many of today’s integrated circuits contain millions of transistors and other tiny parts on a small chip. Smaller and less expensive components make the development of smaller computers, called personal computers, possible. Today’s personal computers are more powerful than the room-size computers of the past. They are able to carry out millions of instructions per second. Small, portable note-book computers usually weigh less than 5 pounds. Even smaller computers can fit in the palm of the hand.