Transcript บทที่ 2 - Suan Dusit Rajabhat University

Chapter 2
Computer
Technology
Computer ?
an automatic electronic working
as intelligence to solve both
simple and complex problems
via mathematical methods.
It differs from other calculators.
Why it not calculator?
Outstanding features of computer
1.
2.
3.
4.
Self Acting
Speed
Storage
Reliability
Why it not calculator?
5.
6.
7.
Accuracy
Repeatability
Communication
Type of computers
Super computer
2. Mainframe computer
3. Mini computer
4. Micro computer
1.
Super Computer
Mainframe Computer
Mini Computer
Micro Computer

Desktop
 with case
 All-in-one

Laptop
 Notebook / Ultra book
 Netbook
 Tablet
Function of Computer
1.
2.
3.
4.
5.
Input Unit – receives data/information from outside
Processing Unit – be processed as ordered
Memory Unit – be stored data in main memory and
secondary memory
Output Unit – display to use
Communication Unit – be connected to a network
Principle of Computer Processing
Secondary
memory
Input data
Central Processing
Unit (CPU)
Main memory
Control
Arithmetic
unit (CU) and Logic
unit (ALU)
Output unit
Hardware
Software
People-ware
Data / Information
Procedure
Input Process
Memory Output
Hardware
Communication
Input Unit
.. is devices used for receive data (text,
sound, picture or multimedia) into
computer
Type of Input Unit
1.
Receive orders from user
2. Receive picture
3. recognition device : Barcode, OMR,
QR code, RFID, etc.
Processing Unit
a piece of hardware that carries out
the instructions of a computer
program. It performs basic
arithmetical, logical, and
input/output operations of a
computer system.
Memory Unit
1.
2.
Main Memory Unit
Secondary Memory Unit
… is the part of the computer that holds
data and instructions for processing.
There are two types of computer
memory inside the computer,
๐ ROM (Read Only Memory)
๐ RAM (Random Access
Memory)
ROM (read only memory)
is used for storing special sets of
instructions which the computer
needs when it starts up. When we
switch the computer off, the contents
of the ROM does not become erased
but remains stored permanently.
ROM (Read Only Memory)
RAM (Random Access Memory)
is really the main store and is the
place where the programs and
software we load gets stored. When
we switch a computer off, whatever
is stored in the RAM gets erased.
RAM (Random Access Memory)
Secondary Memory Unit
DVD
CD
Hard disk
Blu-ray
Thumb drive
Memory card
Output Unit
is any device used to send data
from a computer to another device
or user.




Monitor
CRT
LCD
LED
 Speaker
 Printer
 Dot-metrix
 Ink Printer
 Laser Printer
 Plotter
Communication Unit
is a device allows one computer
connected with another devices or
another computers.
such as: USB, VGA, HDMI, Bluetooth, NFC
(Near Field Communication)
Software
is a program that tells a computer
what to do. There are two main
types of computer software:
System SW and Application SW.
Type of com. Software
1.
System software - is used just to run the
hardware. Or it was called Operating
System (OS)
Computer
OS
2. Application SW - is designed to
be employed by end users to
accomplish specific tasks.
Application SW
Trend of Software usage in the future
1.
2.
3.
SW was used by Smart phone and Tablet.
The way of SW download is Application
store.
SW storage into Cloud computing.