Fist generation of computer definition and Short notes?

First generation of computer definition (1942-1955) 

First generation of computer definition 

      In the 1945 the first generation of computer definition developed in U. S. A Earny research unit. This was called ENIAC.

Disadvantage :-

1. Due to use of vacuum tube this is processed very low data. 

2. Physically this machine was very large and require more space. 

3. The storage capacity was 1KB.

4. This machine were generated significant heat thus more maintenance for longer time. 

5. Computing speed was measured in millisecond.
6. Punched cards were used for input/output operations.

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