Dr. Akhlas Ahmed
An electronic device, operating under
the control of instructions stored in its
own memory unit, that can accept data
(input), manipulate the data according
to specified rules (process), produce
processing, and store the results for
Any hardware component that allows you to
enter data, programs, commands, and
user responses into a computer
Touch Screen, so on
The processor, also called the central
processing unit (CPU), has subdivided into two
major subunits • The control unit interprets the instructions
• The arithmetic/logic unit (ALU) performs
the logical and arithmetic processes
Converts the electronic information produced by the
presentation to end users.
Video Display Unit
Audio Response Unit
Stores data and software instructions needed
Primary Storage Unit – RAM & ROM
Secondary Storage Unit –
Floppy disk, or diskette
Compact Disc CD-R, CD-RW, CD-ROM
DVDs – DVD-ROM, DVD-R, DVD-RW, DVD-RAM
Flash disk/USB drive
Hard disk ( non removable)
Cache Memory for high speed – Storage circuitry stores
temporary instructions and data elements
1. TYPES OF COMPUTER SYSTEMS
• Microcomputer systems
•Personal computers, PDA’s, workstations etc.
• Midrange systems
•Network or Web servers, Multi-user systems etc.
• Mainframe systems
•Enterprise systems, Super servers, Transaction
•Hard Disk Drives
•CD & DVD (Dissociated Vertical Deviation) Drives
3. INPUT TECHNOLOGIES
•Pen based Computing
•Speech Recognition System
Is the general term for various kinds of programs
used to operate and manipulate computers and
their peripheral devices.
TYPES OF SOFTWARE
•Application Software: performs information processing tasks for end
•General purpose application programs
•Application specific programs (custom software)
•System Software: manages and supports operations of computer
systems and networks.
•System management programs.
•System development programs.
Business application software
Electronic mail & Instant messaging
DTP (Desktop Publishing)
Personal information managers
System management programs: Programs that manage the hardware,
software, network and data resources of computer systems during the
execution of information processing jobs of the user.
E.g. Operating system, DBMS etc.
System development program: Programs that help users develop
information system programs and procedures and prepare user programs
for computer processing.
E.g. Programming language translators & editors,
CASE (computer aided software engineering)
for end users
Manages & supports
editors & tools