Computer Generations Evolution of the Computer

Modern Computers Modern computers – Binary, electrical, computational devices

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

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

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

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

PDP-8 – Single bus

Generation 3 Third Generation : Integrated Circuits IC : 1964

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

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