The document discusses the main components of a computer system including the central processing unit, primary storage devices like RAM and ROM, secondary storage devices like hard disks and tapes, as well as input devices such as keyboards and mice and output devices such as monitors, printers, and speakers.

2. 

3.  Central
processing unit (CPU)
 Primary storage
devices
 Secondary
storage devices
 Input devices
 Output devices
 Communications
devices

4. Central
processing unit (CPU)
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5. (Primary
storage devices)
 Read-only memory (ROM )
(Start-up)
ROM
non-volatile memory
 Random access memory (RAM)
RAM
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6. Secondary
Storage)
 hard disk
 tapes
 CD
DVD
 Memory cards and Flash
memory
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7. Input
Devices)
Scanner
Digital camera
Digital Video camera
 Keyboard,
mouse
Pen input devices
Touch screen Joystick
 Microphone
Web cam

8. Output
Devices)
LCD Monitor
 Terminal CRT Monitor Projector
inkjet Printers Speaker
laser Printers Headphone
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