The document discusses different types of computers: - Analog computers represent data with continuous physical quantities like voltage. Accuracy depends on precision of measurements. - Digital computers use discrete values like binary digits to represent data symbols. They are used for business/science data processing and storing large quantities of data magnetically. - Hybrid computers combine analog and digital, using analog input converted to digital for processing and accuracy. - Other computer types discussed are mainframes for CPU/I/O intensive jobs, mini computers for real-time multi-user apps, microcomputers for simple tasks, and supercomputers for large data and intensive computing.

2.  Analog Computer
 Hybrid Computer
 Digital Computer

3.  In this computer represents data as numbers or
separate unit’s.
 Digital computer operates an decimal digits that
represents either discreat data or symbols.
 It takes input and give output in the form of numbers,
letters and special characters.
 This type computers are generally used for business
and scientific data processing and also had a unique
ability that is storing large quantities of data.
 In this computer magnetic media is used as storage
device.

4.  This type of computer represents number by a physical
quantity that is they assign numeric values by physically
measuring some actual property, such as the length of an
object, an angle created by two lines or the amount of
voltage passing through a point in an electric circuit.
 Analog computer derive all their data from some of
measurement.
 Though effective for some applications this method of
representing number is a limitations of the analog
computer.
 The accuracy of the data used in an analog computer is
directly related to the precision of its measurement

5.  Hybrid computer combine the most desirable feature
of both analog and digital computer.
 They have the speed of Analog Computer and the
accuracy of Digital Computer.
 They usually used the special problems in which
input data derived from measurements is converted
in to digits and processed by computers.

6.  Main frame Computer
 Mini Computer
 Micro Computer
 Super Computer

7.  Faster than Mini Computer and have larger memory
used in CPU intensive or I/O intensive job,like
 In scientific and business applications and to
process high volume of data in large business
applications..
Example-IBM-370 and IBM-S/390,
DEC VAX-8800,
CPC-7600, UNIVAC-1110

8.  Relatively faster and low cost compared to mainframes,
higher than PCs.
 Design for real time dedicated multi user applications.
Example-IBM-17,
HP-3000
DECPDP-11

9.  Slow, cheap significant computing power.
 Use of INTEL chips. Single processor system
which can supports the simple tasks like
WP,ESS,DBMS etc
Example-PS 386, 486
PENTIUM (P-1, 2 ,3, 4)

10.  Large in size and large memory compared to all other
computers.
 Ideal for high end computing applications involving
large volume of data and intensive computing use-
INTEL chips.
 These computers are design for ultra high performance
tasks such as encryption, cracking, creation of
animation and for designing all knowledge based
systems.
Example- IBMs Deep Blue,
CDC cyber family and
CRAY X-mp/26

11.  Internet
 IT Books of SMU