This document discusses the basic components of a computer system and various input and output devices. It outlines the main units of a computer including the input, output, processing, and memory units. It then describes different types of input devices such as keyboards, mice, scanners, microphones, and cameras. It also discusses various output devices like monitors, printers, and speakers. The document concludes by explaining different roles in the IT field including programmers, software engineers, network administrators, and computer center managers.

1. 3
Input Unit)
Memory Unit)
Central Processing Unit - CPU)
Output Unit)

2. Case)
Monitor)
Disk drive)
(Keyboard)
Mouse)
Speaker)
5
1) Input Unit)
2) Central Processing Unit - CPU)
3) Memory Unit)
4) Output Unit)
5) Peripheral Equipment)
Input Unit)
Input Unit)
1) (Keyboard)
7 8 (Operator)
2) Mouse)
3
- Mechanical)
- Optical mouse)
- Wireless Mouse)
3) OCR (Optical Character Reader)
(Barcode reader)
4) OMR (Optical Mark Reader)
(Answer sheet)
5) (Digitizer)
6) (Scanner)
3
Sheet-Fed Scanner)
Flatbed scanner)

3. Hand-held Scanner)
7) Light Pen)
8) Joy Sticks)
9) Touch Screen)
10) Point of Sale Terminal)
11) Touch Pads)
12) Digital Camera)
13) (Voice Input Devices)
Memory Unit)
2
1) Main Memory) Internal Memory)
2
Read Only Memory - ROM)
Random Access Memory)
2) Second Memory) External Memory)
- Hard Disk)
- Floppy Disk) 3.5
(Mylar) 1.44
- Compact Disk - CD)
Poly
Carbonate) Single Track)
120 Audio CD) Video CD -
VCD) CD Recordable - CD-R) CD-Rewritable - CD-RW) Digital Video Disk - DVD)
3) (Removable Drive) (Drive)
Port USB 8 , 16 , 32
, 64 , 128 1024 Pen Drive , Thump Drive , Flash Drive
4) Zip Drive) 100
Zip Disk)
5) Magnetic optical Disk Drive 3.5

4. MO Disk drive 1 128 5.2
6) Tape Backup)
10-100
7) Memory Card)
(Personal Data Assistant - PDA)
Central Processing Unit - CPU)
----- Processor) chip)
3
1) (Arithmetic & Logical Unit : ALU)
2) Control Unit)
Pentium III , Pentium 4 , Pentium M (Centrino) , Celeron , Dulon , Athlon
Output Unit)
Output device)
1) Monitor) 2 CRT
(Cathode Ray Tube) LCD (Liquid Crystal Display)
2) (Printer)
4
Dot Matrix Printer) Ink-Jet Printer) Laser
Printer) Plotter)
3) Speaker)
Sound card)
3 : Execute Instruction ALU
1) Modem) modulate/demodulate)
Internal Modem External Modem
2) (LAN card)
(Workstation) Server)
1) ?
2) ?
3) ?
(CPU) Intel , AMD Celeron

5. 1.4 - 2.4
- AMD Duron , Athlon Socket A
- Intel Pentium , Celeron Socket 370
- Intel Pentium 4 Socket 478
DDR RAM 128
Bus 66, 100, 133
ATA 20 - 40
VGA , SVGA XGA 3D
3
15 - 17 CRT LCD
LCD CRT
50X
3.5
PCI 3
External Modem)
(Internal Modem)
-- 56 bps
- Dot Matrix
- Ink Jet
--
- Laser Printer
Stylus)
TFT

6. 800 x 600 16
128
5
DVD Drive) Sound card
Network)

7. 4
Hardware)
Software)
programmer)
2
System Software)
OS (Operating System)
Windows Linux

8. Application Software)
“ ” Software Park (www.swpark.or.th)
SIPA – Software Industry Promotion Agency)
(www.sipa.or.th)
www.swpark.th www.sipa.or.th
(People)
3
User/End User)
Call center)
system analyst
(requirement)

9. (Computer
Operator/Computer Technician)
“
computer technician)
help desk
System Analyst)

10. (Programmer)
programmer
(
(
module)

11. programmer)
Web programmer
Application programmer
System programmer
Software Engineer)
software engineer
line of code)

12. (Network Administrator)
Network Administrator
CIO-Chief Information
Office)
CIO (Chief Information Office)
CIO
“ ”
CIO

13. (Computer Center Manager/Information
Technology Manager)
CIO
CIO
CIO
CIO
help desk
24