The document outlines the history of computers from earliest mechanical devices like the abacus and slide rule through generations of electronic computers using vacuum tubes, transistors, and integrated circuits. It describes the evolution from room-sized computers like ENIAC to microcomputers and personal computers, noting the development of the microprocessor and key periods defined by Windows operating systems and Internet connectivity.

1. HISTORY OF COMPUTERS

2. EARLIEST COMPUTERS
• Abacus

3. • Napier’s Bones

4. • Ougthred’s Slide Rule

5. • Pascal’s Calculator

6. • Leibniz’s Calculator

7. • Babbage’s Difference Engine and the
Analytical Engine

8. • Hollerith’s Punch Card Machine

9. EARLY ELECTRONIC COMPUTERS
• Mark I

10. • ENIAC

11. • EDVAC

12. GENERATIONS OF ELECTRONIC COMPUTERS
• First Generation (1950’s)

13. • Second Generation (Early to Mid-1960’s)
Transitors
• Third Generation (Mid to Late-1960’s)
Integrated solid-state circuitry
• Fourth Generation (1970’s onwards)
The development of the microprocessor

14. “GENERATIONS” OF PERSONAL COMPUTERS
• Early Microcomputers (Mid- to late-
1970’s)
• The PC Generation (Early- to late-1980’s)

15. • The Windows Generation (Early- to Mid-
1990’s)
• The Internet Generation (Late-1990’s to
present)