This document discusses the different types of digital computers: - Supercomputers are the most powerful and can process large amounts of data for complex problems. Examples include Cray computers. - Mainframes are large, expensive computers used by large organizations for data storage and processing. Examples include IBM mainframes. - Mini computers are smaller than mainframes but more powerful than PCs. They are used in businesses, education and government. - Personal computers include desktops, notebooks, and servers. They were first introduced by IBM and are now made by many manufacturers. - Mobile devices are small, portable computers like smartphones, tablets, and media players. They store data on memory cards. - Embedded computers are very small

1. Types of digital computers

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3. o Supercomputers
o Mainframes
o Mini Computers
o Personal Computers
o Mobile Devices
o Embedded Computers

4.  Developed in 1980’s by Cray.
 Heavy , powerful , expensive.
 Process large amount of data.
 Store more than 20,000 times data than desktop
computers.
 Solve complicated problems.
 Thousands computers can be connected at same time.
 Use in weather forecasting , aircraft designs , online
banking.
 Examples:
 CRAY-1,CRAY-2 etc.

6.  Introduced in 1975.
 Large in size , can store large amount of
data/instructions information.
 Has multiple processors and can process millions
of instructions per second.
 They can be use in large organizations such as in
banks , in airlines for scheduling and reservation of
seats.
 Special use in Network environment.
 Examples:
 IBM S/390,Control Data CYBER 176 etc.

8.  First introduced in mid of 1960’s.
 Also known as midrange computers.
 Small in size , costly than PCs , having multiple
processors.
 Processing speed is less than mainframe but more
than PC.
 Use in business , education , in Govt
Departments.
 Mostly use as server in network environment.
 Examples:
 IBM AS/400 , IBM System 360,HP 3000 etc.

9.  First designed by IBM in 1981 names as IBM-PC.
 Also known as microcomputers.
 small in size , less expensive , consist of processor
, input/output devices , storage devices
,communication devices.
 “PC-compatible” refers to any personal computer
based on original IBM personal computer design.
 PC and PC-compatible use Windows operating
system while Apple usually use Macintosh
operating system (Mac OS).
 Companies making PCs Dell , HP , Toshiba.

10. Types of
PCs:
 Desktop
Computers
 Server Computer
 Workstation
 Notebook
Computers

11.  Small in size , can fit in pocket or in one hand ,
internet enabled device.
 Don’t have Disk Drives.
 Stores information and programs permanently on
special storage media like Memory cards.
 Can be connect to PC for exchange data.
 Examples:
 Handheld computers , PDAs (personal digital
assistant) , smart phones, portable media players ,
digital computers etc.

13.  Also called microcontroller.
 Computing device , limited hardware , have circuit
board , control functions of device.
 Use in many electronic devices like mobiles and
digital telephone , printers , DVD players , fax
machines , photocopy machines etc.
 In medical equipment , washing machines ,
microwave oven.
 Example:
 Microcontroller in a printer monitors the functions
of printer.