| 1st | 2nd | 3rd | 4th | 5th | |
|---|---|---|---|---|---|
| Period | 1940 – 1956 | 1956 – 1963 | 1964 – 1971 | 1972 – 2010 | 2010-till date |
| Components | Vacuum Tubes | Transistor | Integrated Circuits – ICs | Microprocessor,Large Scale ICs | SiliconChips,ULSI,AI |
| Computer | EDVAC,ENIAC,EDSAC,UNIVAC | IBM-1401 | IBM-370 | PDP 11 | NoteBook,UltraBook.... |