4. Outline
Block diagram of computer
Input Unit
Storage Unit
Output Unit
Central Processing Unit
References
5. Block Diagram of Computer
Input OutputProcessing
Input Unit Output UnitStorage
Control Unit
ALU
CPU
6. Input Unit
Accept data and information from user.
Convert it to a form that the computer can
understand.
Supply the converted data to the computer system
for further processing.
Eg: keyboard, mouse, scanner, mic, etc…
7. Storage Unit
The storage unit of the computer holds data and instructions,
before & after processing.
Types: Primary Storage Unit & Secondary Storage Unit
1. Primary Storage
Temporary
Faster
Expensive
Less storage capacity
8. Storage Unit (Cont…)
Refers to RAM
2. Secondary Storage
Permanent
Slower than primary
Cheaper
High storage capacity
Refers to HDD
9. Output Unit
The output unit is used to present soft and hardcopy of information
after processing.
Output may be a text, audio, video, etc…
Eg: Monitor, printer, speaker, etc…
10. Central Processing Unit
The Control unit and Arithmetic logical unit(ALU) of the computer
are together known as the Central Processing Unit (CPU).
It is known as the Brain of the computer.
ALU controls all the arithmetic operations, while control unit
controls the other units of the computer.
A PC may have CPU-IC such as Intel 8088, 80286, 80386, 80486,
Celeron, Pentium, Pentium Pro, Pentium II, Pentium III, Pentium IV,
Dual Core, and AMD etc.