The modern computer took its shape with the arrival of your time. It had been around 16th century when the evolution of the computer started. The initial computer faced many changes, obviously for the betterment. It continuously improved itself in terms of speed, accuracy, size, and price to urge the form of the fashionable day computer. This long period is often conveniently divided into the subsequent phases called computer generations: First Generation Computers (1940-1956) Second Generation Computers (1956-1963) Third Generation Computers (1964-1971) Fourth Generation Computers (1971-Present) Fifth Generation Computers (Present and Beyond)

1. Computer Generations

2. Key for Computer Generations
• Time Frame
• Circuit Components
• Elements per Component
• Internal Storage
• Memory Capacity
• Data Input
• Popular Computers and Companies at that time

3. First Generations 1951- 1958
• Vacuum Tubes
• Magnetic Drum
• 4,000 bits
• Hard Wire Programs in computers
• IBM 650, Univac I
• ENIAC

4. Second Generation 1959-1964
• Transistors
• Magnetic Cores
• 32,000 bits
• Punch Cards
• CDC, GE, IBM

5. Third Generation 1965-1974
• Silicon Chips (Integrated circuits)= IC
• Cores, IC’s
• 128,000 bits
• Keyboard Entry
• IBM, NCR, Honeywell

6. Fourth Generation 1975-1989
• Silicon Chips (Large scale integrated
circuits)=LSI
• IC’s, LSI’s
• 100 million bits
• Read programs off disks
• Apple, Xerox, Texas Instrument, Hewlett-
Packard

7. Fifth Generation 1990-present
• Silicon Chips ( Very Large Integrated Circuits)
VLSI
• LSI’s, VLSI’s
• Unlimited
• CdRom, Optical Disk
• NEC, Packard Bell, Compaq, Other Clones

8. Information is Power