Four Generations of Computer
The first generation of computer used vacuum tube technology as basic components. They consumed a lot of electricity and produced lots of heat. They were also very big which meant that they were not portable. They were very expensive
These computers were cheaper than the previous generation and more reliable. They consumed less energy, they were more compact in size and they were faster too. They used magnetic cores as primary memory devices and they used magnetic tape or disks as secondary storage devices.