Course Goals

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2. Course Goals • Understand the capabilities and limitations of computers • Understand common terminology • Get a bit of practical computer knowledge • Learn the fundamentals some common computer applications • Have fun!!

3. Why “Computer Literacy?” • To be able to understand how technology works and how it will affect our lives • To be better able to use new technology • To be able to analyze media accounts of technological trends

4. Topics for the semester • History • Digital Information • How is information represented digitally? • Practical Knowledge • How does it work? • What is a computer? • Computer Networks • Connecting computers together creates a powerful new tool • Social Issues • Applications • What do you want to learn about?

5. The Early Period: Up to 1940 • 3,000 years ago: Mathematics, logic, and numerical computation • Important contributions made by the Greeks, Egyptians, Babylonians, Indians, Chinese, and Persians • 1614: Logarithms • Invented by John Napier to simplify difficult mathematical computations • Around 1622: First slide rule created

6. The Early Period: Up to 1940 (continued) • 1672: The Pascaline • Designed and built by Blaise Pascal • One of the first mechanical calculators • Could do addition and subtraction

7. The Early Period: Up to 1940 (continued) • 1801: The Jacquard loom • Developed by Joseph Jacquard • Automated loom • Used punched cards to create desired pattern • An aside: Luddites

8. The Early Period: Up to 1940 (continued) • 1823: The Difference Engine • Developed by Charles Babbage • Capabilities: • Addition, subtraction, multiplication, and division to 6 significant digits • Solve polynomial equations and other complex mathematical problems • Played the horses… • First programmer was Ada Lovelace

9. The Early Period: Up to 1940 (continued) • 1890: U.S. census carried out with programmable card processing machines • Processing the census took more than 10 years! • Built by Herman Hollerith • These machines could automatically read, tally, and sort data entered on punched cards

10. The Birth of Computers: 1940–1950 • Development of electronic, general-purpose computers • Did not begin until after 1940 • Was fueled in large part by needs of World War II • Mark I, ENIAC, ABC system, Colossus, Z1

11. The Birth of Computers: 1940–1950 • Stored program computer model • Proposed by John Von Neumann in 1946 • Stored binary algorithm in the computer’s memory along with the data • Is known as the Von Neumann architecture • Modern computers remain, fundamentally, Von Neumann machines • First stored program computers • EDVAC • EDSAC

12. The Modern Era: 1950 to the Present • First generation of computing (1950-1959) • Used vacuum tubes to store data and programs • Each computer was multiple rooms in size • Computers were not very reliable

13. The Modern Era: 1950 to the Present (continued) • Second generation of computing (1959-1965) • Replaced vacuum tubes by transistors and magnetic cores • Dramatic reduction in size • Computer could fit into a single room • Increase in reliability of computers • Reduced costs of computers • High-level programming languages • The programmer occupation was born

14. The Modern Era: 1950 to the Present (continued) • Third generation of computing (1965-1975) • Used integrated circuits rather than individual electronic components • Further reduction in size and cost of computers • Computers became desk-sized • First minicomputer developed • Software industry formed

15. The Modern Era: 1950 to the Present (continued) • Fourth generation of computing (1975-1985) • Reduced to the size of a typewriter • First microcomputer developed • Desktop and personal computers common • Appearance of • Computer networks • Electronic mail • User-friendly systems (Graphical user interfaces) • Embedded systems

16. Figure 1.7 The Altair 8800, the World’s First Microcomputer

17. The Modern Era: 1950 to the Present (continued) • Fifth generation of computing (1985-?) • Recent developments • Massively parallel processors • Handheld devices and other types of personal digital assistants (PDAs) • High-resolution graphics • Powerful multimedia user interfaces incorporating sound, voice recognition, touch, photography, video, and television

18. The Modern Era: 1950 to the Present (continued) • Recent developments (continued) • Integrated global telecommunications incorporating data, television, telephone, FAX, the Internet, and the World Wide Web • Wireless data communications • Massive storage devices • Ubiquitous computing

19. Think about it… • More transistors were put on chips last year than grains of rice were grown in the world. • Computers are not going anywhere soon.