1. System unit
Performed by Bektasova P.S.
Checked by Sultanova Zh.Zh.

2. What is it?
System unit is a box-like case that contains electronic components with different functions
All components work together to accomplish main function of a computer

3. Common components Motherboard Processor System clock Memory
Expansion cards
Ports
Power supply
Hard disk

4. Motherboard Main circuit board of the system unit
Ties everything together in a computer
Contains expansion slots, processor chips and memory slots
Also called system board

5. Central Processing Unit (CPU)
Interprets and carries out basic instructions that operate a computer
Also called the processor

6. Central Processing Unit (CPU)
Control unit (CU)
Directs and coordinates operations in computer
Arithmetic/ Logic unit (ALU)
Perform arithmetic operation and logical operation
Control the speed of the operation

7. System clock Controls timing of all computer operations
Generates regular electronic pulses, or ticks, that set operating pace of components of system unit

8. Memory
Temporary storage area for operating system, application programs, and data
Consists of one or more chips on motherboard
Each byte stored in unique address

9. Memory. Two types RAM (Random Access Memory) ROM (Read Only Memory)
Memory used by computer to store data while working on the system
ROM (Read Only Memory)
It contains permanently recorded instructions, vital for starting up a computer

10. Expansion cards
How are expansion cards used?

11. Ports Inlets and outlets that connect external devices to system unit
mouse
Inlets and outlets that connect external devices to system unit
keyboard
USB
USB
serial port
printer (parallel port)
speaker
monitor
microphone
game port
network
telephone line out
telephone line in
FM reception
svideo out
cable TV

12. Serial ports Parallel ports
Transmits one bit of data at a time.
Connects slow-speed devices, such as mouse.
Transmits more than one bit data at a time.
Uses devices like printer.

13. Hard disk
A part of a unit, often called a "disk drive,“ "hard drive," or "hard disk drive”
Stores information
Provides quick access to data

14. System unit is the HEART of the computer

15. Sources