COMPUTER FUNDAMENTALS

Detailed explanation-1: -The first generation computers used vacuum tubes for circuitry and magnetic drums for memory, and were often enormous, taking up entire rooms. The vacuum tube was developed by Lee De Forest. A vacuum tube is a device generally used to amplify a signal by controlling the movement of electrons in an evacuated space.

Detailed explanation-2: -A transistor computer, now often called a second-generation computer, is a computer which uses discrete transistors instead of vacuum tubes.