Types of computers

Types of computer on the basis
of data handled

Analog Computers
 The computers that measure continuous data like
physical quantities such as pressure, speed, time or
temperature and convert them to numeric values
 also called analogue computer
 Designed to perform a particular or a single task
 Low accuracy and limited storage capacity but very
high speed
 widely used in industrial, medical and scientific
purposes
 Some examples of analog or analogue computers are:

Heathkit EC-1 Slide Rule: First analog
computer invented by
William Oughtred in 1620
AKAT-1

Digital Computers
 The computers which is both electronic and digital
computer
 Measures discrete or discontinuous data and uses binary
digits 0 and 1.
 Most popular computer.
 Highly accurate, fast and reliable
 Use processor as a memory chip
 Information is given to the computer in the form of electric
signals
 Used to perform arithmetic and logical calculations
 Some examples of digital electronic computers are:

Desktop Computers Laptop Computers

Apple/ Macintosh Tianhe 2 IBM PC
IMSAI 8080 PDP 8

There are generally two types of digital
computer, they are:
General purpose digital
computer
I. Designed to perform many
tasks.
II. Complex and expensive.
III. Used in engineering,
science, commerce and
industry.
Special purpose digital
computer
I. Designed to perform specific
task.
II. Simpler and cheaper.
III. Used in automobiles to
control fuel and breaking
system accounting software
used, accounting software
used by business firms,
banks, etc.

Hybrid Computers
 The computer which is the combination of both digital
and analog computer
 Mostly used for scientific research and engineering
purposes
 Has the speed of analog computers and the accuracy of
digital computers
 Special purpose machines.
 Have convertors which can covert analog signal into
digital signal and vice versa.
 Some examples of hybrid computers are:

Polish hybrid computer WAT 1001

Types of computer on the
basis of size

Super Computers
 Largest and powerful computer
 Capable of processing large amount of data at a tremendous
speed.
 Expensive and used only for specialized purpose.
 Kept in protective room with special cooling systems, power
protection and other security features.
 Speed of super computer is measured in FLOPS (Floating point
Operations Per Second)
 Used for weather forecasting, weapon research, designing
vehicles, aircrafts, oil exploration, nuclear research etc.
 For Example:: CRAY, PLEIADES, PARAM PADMA, IBM ROAD
RUNNER, TIANHE-IA, NEC EARTH SIMULATOR, CRAY
JAGUAR, IBM BLUE GENE, STRATUS etc…..

Contd…Super Computers
PLEIADES PARAM PADMA

IBM ROAD RUNNER
TIANHE-IA

NEC EARTH SIMULATOR
(measures effects of global
warming)
CRAY JAGUAR

STRATUS
(weather forecasting)
IBM BLUE GENE

Contd…..Super Computer
Deep Blue was a chess-playing
computer developed by IBM. On May 11,
1997, this machine won the six-game match
against world champion Garry Kasparov by
two wins to one with three draws. Kasparov
accused IBM of cheating and demanded a
rematch. IBM refused and retired Deep Blue.
Kasparov had beaten a previous version of
Deep Blue in 1996.

Mainframe Computer
 Also known as BIG IRON
 Second largest, powerful, expensive and ultra fast
computers
 High speed data processing with massive storage capacity
 Supports upto 100 or 1000 users at a time
 Kept inside glass offices with special air conditioning , full
power backup and other security features.
 Used in large organization, financial data processing,
universities, military purpose etc
 For EXAMPLES::

Contd…Mainframe Computers
IBM SYSTEM/360UNIVAC I

IBM SYSTEM /370 IBM 704

HONEYWELL 1800IBM 7094

Mini Computer
 Mid range computer with slower speed, less memory
capacity, limited hardware compared to mainframe
computers
 Supports up to 50 users at a time
 Used in large organization, universities, research
institute etc
 Used to look out production process and stocks in
industries, payroll preparation, accounting and
scientific computation
 For EXAMPLES::

Contd…Mini Computers
HP 3000 SERIESPDP 8

GENERAL AUTOMATIONINTERDATA 8/32

DEC- PDP 11CAI 216

Micro Computer
 Small digital computer with MICROPROCESSOR in
CPU
 Cheap, compact, portable with excellent graphic
capabilities
 Consist of RAM, suitable storage device and various
input/output devices
 Designed to be used by a single person only
 Used in schools, home, offices, banks, hospitals etc…
 Also known as “PERSONAL COMPUTER”
 For EXAMPLES::

Contd…Micro Computers
IMSAI 8080MITS ALTAIR 8800

Contd…Micro Computers
MOTOROLA MEK6800D2AIM 65

Types of Micro Computers
 Desktop Computers
 Designed to be used on the desk or table
 Separate system unit (CPU), screen, keyboard, mouse,
speakers etc
 Not so portable
 Consists of 2 types of models
 DESKTOP model is broad and low
 TOWER model is narrow and tall

Contd…Desktop Computers
DESKTOP modelTOWER model

Contd…Examples of Desktop Computers

 Laptop Computer
 Designed to be used on the lap
 System unit (CPU), screen, keyboard, touchpad,
speakers etc are integrated (combined)
 Small, portable designed for mobile use
 Comes with a rechargeable battery
 Can be used at the time of no electricity for few hours if
charged sufficiently

Contd…Examples of Laptop Computers

 Palmtop Computer
 Small, light weight, programmable computer designed
to be used on the palm of hand
 Use stylus or Metal pen and touch sensitive screen
 Also known as Handheld PC
 EXAMPLES::NEC MOBILE PRO 900C, HP 320LX, HP
JORNADA 720, VADEM CLIO

Contd…Examples of Palmtop Computers
NEC MOBILE PRO 900c HP 320LX

Contd…Examples of Palmtop Computers
HP JORNADA 720 VADEM CLIO

 Wearable Computer
 Computer that can be worn on the body
 Consist of voice recognition, head mounted display,
wireless communication, touchpad etc
 Used in health monitoring system, information
technology, military trainings etc.
 EXAMPLES::POMA, TIMEX DATALINK etc…

Contd…Examples of Wearable Computers
POMA TIMEX DATALINK

KOPIN GOLDEN I GEN 2 VIVOMETRICS

GOOGLE GLASS SYMBOL WT-4000 SERIES

 Pocket Computer
 Small, portable handheld, calculator sized computer
running on batteries
 Data transfer can be done by connecting it to desktop or
laptop or through Bluetooth as well
 EXAMPLES::PB-2000, PB-80, PB-100, PB-500F etc…

PB-2000C
Contd…Examples of Pocket Computers
PB-80

PB-100
PB-500F

OQO MODEL 2
SONY VAIO ZX-8

Types of computers

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