First generation computers used vacuum tubes as the basic components for memory.
First generation computers, which were developed in the 1940s and 1950s, used a variety of technologies that are quite different from those used in modern computers. Some of the main components of first-generation computers included:
Overall, first generation computers were much larger and less powerful than modern computers, and they used a variety of mechanical and electromechanical components in addition to vacuum tubes. They were also much slower and less efficient than modern computers, and they required a lot of maintenance.