1. Computer Generations Evolution of the Computer

2. Modern Computers Modern computers – Binary, electrical, computational devices

3. Generation 0 Zeroth Generation : Mechanical & Electrical Relays Babbage – Analytical Engine –Punch card programs –Mechanical but digital COLOSSUS – Single purpose electrical digital computer Mark I – General purpose electrical computer

4. Generation 1 First Generation : Vacuum Tubes ENIAC 18,000 vacuum tubes; 1500 relays; 6,000 switches –Intel i7: ~2 billion transistors

5. von Neumann Architecture Foundation for modern computer design – EDSAC/IAS machine

6. Generation 2 Second Generation : Transistors Transistor: 1948 PDP-1 : first interactive, commercial machine

7. PDP-8 – Single bus

8. Generation 3 Third Generation : Integrated Circuits IC : 1964

9. IBM 360 Family of computers – Less powerful one emulate instructions – Support for multiprogramming

10. Generation 4 Fourth Generation : 1980-present –PC era –VLSI Very Large Scale Integration