First generation computer

 In 1837, Charles Babbage was the first to conceptualize and design a fully programmable mechanical computer.
Limited finances and Babbage's inability to resist tinkering with the design meant that the device was never completed ; nevertheless his son, Henry Babbage, completed a simplified version of the analytical engine's computing unit (the mill) in 1888.

 The first electronic computers were developed in the mid-20th century (1940–1945). Originally, they were the size of a large room, consuming as much power as several hundred modern personal computers
The first generation of computer consists of vacuum tubes.