First Generation = First Generation. The period of first generation was from 1942-1956. The computers of first generation used vacuum tubes as the basic components for memory and circuitry for CPU (Central Processing Unit). These tubes, like electric bulbs, produced a lot of heat and the installations used to fuse frequently. Second Generations = A transistor computer, now often called a second generation computer, is a computer which uses discrete transistors instead of vacuum tubes. ... A seco

The ENIAC was the first large-scale electronic computer in the United States. Its hundreds of cables and switches were programmed by six young women, including Kay Antonelli, Jean Bartik (2008 Fellow Award Honoree), Betty Holberton, Marilyn Meltzer, Frances Spence, and Ruth Teitelbaum. Discover their story: http://bit.ly/162jmYu #WomensHistoryMonth | Computer History Museum