1. Compiled by Doris Shih Computers Hardware

2. Types of Computers Supercomputer Mainframe computer Minicomputer Personal workstation Personal computer (PC) Laptop/portable computer Personal digital assistant (PDA)

3. Components of a computer system Input Devices Output Devices Central Processing Unit Internal Memory

4. Main Part Motherboard Central Processing Unit (CPU) Memory Read-Only Memory (ROM) Random-access Memory (RAM) Power

5. Input-Only Devices Alphanumeric input Keyboards Optical Scanners Graphic/spatial input Mouse Touch screens Light pens Graphic tablet Track-Ball Graphic Scanner Joy sticks

6. Input-Only Devices (2) Audio/Voice input Microphones CD-ROM players/DVD-ROM

7. Input-Output Devices Disk drives (storage) Floppy (e.g., 3 ½ & 5 ¼) Hard WORM (write once read many) drives Zip (storage) Modems

8. Output-Only Devices Printers Speakers/headphones Video Plotters

9. Operating Systems (OS) Earlier OS: Apple DOS MS-DOS UNIX OS with Graphical-use interface (GUI) Macintosh OS Microsoft Windows IBM OS/2

10. References Merrill, P. F., et al. Computers in Education. Boston: Allyn & Bacon, 1996. Lockard, J., Abrams, P. D., & Many, W. A. (1994). Microcomputers for twenty-first century educators, 3 rd ed. New York: HarperCollins.