2. ONLINE
?In general, when a machine is "online," it is turned
on and connected to other devices. For example,
when a network printer is online, computers
connected to that network can print from it.
?Other devices, such as scanners, video cameras,
audio interfaces, and others are said to be online
when they are running and connected to a
computer system.
3. ?Recently, however, the term "online" usually means being
connected to the Internet.
?The connection can be through a phone line
?using a dial-up
?DSL modem
?a cable line via a cable modem
?through a wireless connection.
?A computer can also be online via a connection to a computer
network. Technically, computers that are on a network are
online even if they are not connected to the Internet. But most
networks are routed to a T1 line or other Internet connection
anyway. When a computer or other device is not online, it is
said to be offline.
4. ONLINE SYSTEM
? Computer or device connected to a network (such as Internet)
and ready to use (or be used by) other computers or devices.
? Database, file, or webpage available for downloading or
reading.
? Services such as ticket reservation systems, or capability such
as online help, available directly through a computer system or
under its direct control.
Read more:
http://www.businessdictionary.com/definition/online.html
5. COMPUTER PLATFORM
?A computer platform is a system that consists of a
hardware device and an operating system that an
application, program or process runs upon. An example of
a computer platform is a desktop computer with Microsoft
Windows installed on it. A desktop is a hardware device
and Windows is an operating system.
?The operating system acts as an interface between the
computer and the user and also between the computer and
the application. So, in order to have a functional device, you
need hardware and an operating system together to make
a usable computer platform for a program to run on.
6. ? The hardware portion of a computer platform consists of
?processor
?memory
?storage.
? The processor is a bit like your brain and memory is like a
scratchpad for your brain to use while you're working out a problem.
? It used to be that people referred to different computer platforms by
their physical size, from smallest to largest
?microcomputers (smallest)
?minicomputers (mid-size
?mainframes (largest).
? The term microcomputer has fallen somewhat out of favor - now
most people just refer to these machines as computers or personal
computers.
7. ? In personal Computing, a Platform is the basic hardware (computer)
and software (Operating system) on which software applications can
be run.
? What does Platform really mean?
A Platform is a group of Technologies that are used as a base upon
which other applications, processes, or technologies are developed.
? In personal Computing, a platform is the basic hardware (Computer)
and software (Operating System) on which software applications can
be run.
? The operating system acts as an interface between the computer and
the user and also between the computer and the application
? Computers uses specific central processing units (CPU's) that are
designed to run specific machine language code. In order for the
computer to run software applications, the application must be in the
CPU's binary coded machine language.
8. ?Thus historically, application programs written for one
platform would not work in a different platform.
?Additionally, a "platform" is a system that can be
programmed and therefore customized by outside
developers - users - and in that way, adapted to countless
needs and niches that the platform's original developers
could not have possibly contemplated, much less had time
to accommodate.
?So, "The key term in the definition of platform is
'programmed'. If you can program it, then it's a platform. If
you can't, then it's not."
10. MAINFRAMES
?This type is primarily used by large organization for
various application including bulk data, process
control, industry and consumer statics and son on.
The term referred to as the large cabinets which is
called main frames. It was developed first in 1950s
and continued to evolve till now and today also in
use. It is optimized for computational speed and
handle very high volume data. Speed is expressed
in MIPS.
12. PERSONAL COMPUTER
? Personal computer is also known as microcomputer. It is relatively small
as computer to other types and not so expensive, especially designed
for a single user. As the term we also used microprocessor , so they are
based on microprocessor technology which enables to put an entire
CPU on one chip.This used at home is for playing games. Business
persons also used to word processing, accounting, desktop publishing,
database management and so on.
? PC first comes in 1970s which is one of the most popular personal
computer. In 1977s Apple II introduced first Apple computer. During the
1970s and 1980s , new model and operating systems seemed to
existence. After that in 1981, IBM entered fray which is first personal
computer known by IBM PC.
14. MINICOMPUTER
? This type of computer platform is smaller is size but posses most of the
features and capabilities of a large computer. Fill space between the
microcomputer and the mainframe computer platforms. It always use
midrange servers operating business as well as scientific application.
But now thesedays term is vanished or you can say merged with server.
? Minicomputer was developed by IBM Corporation and comes in mid of
1960s. Used as the mid-range servers so that they can be operated in
software application and support great number of users at the same
time. It can also contain more than one processor they are supporting
multiprocessing and tasking.They are powerful then microcomputers
and workstation.
16. PLATFORM: OPERATING SYSTEM
? In the computer world, a "platform" typically refers to a computer's operating
system.
? For example, a Dell computer running Windows XP would be considered to be
running on a Windows platform.
? An iMac, on the other hand, runs on the Macintosh platform.
? It is a more generic way of referring to a computer's operating system than having
to specify, for example,Windows XP Professional SP 2, or Mac OS X 10.3.5.
? The term platform is often used when referring to what kind of computer systems a
certain software program will run on.
18. WHAT IS OPERATING SYSTEM
?operating system is the set of programs that
controls a computer.
?It provide a pleasant and effective interface
between the user and the hardware
?Makes the computer more convenient to
use
21. FUNCTIONS OF OPERATING SYSTEM
?Process Management
?Memory Management
?File Management
?Security management
?Command Interpreter
22. 1.PROCESS MANAGEMENT
?By process management OS
manages many kinds of
activities :-
?All process from start to shut down
?Creation and deletion of user and
system processes.
23. 2. MEMORY MANAGEMENT
?The major activities of an operating regard
to memory-management are:-
?Decide which process are loaded into
memory when memory space becomes
available.
?Allocate and deallocate memory space as
needed.
24. 3.FILE MANAGEMENT
?The file management system allows the
user to perform such tasks:-
?Creating files and directories
?Renaming files
?Coping and moving files
?Deleting files
26. 5.COMMAND INTERPRETER
?A command interpreter is an interface
between system and the user. There are
two types of user interface:-
?Command line
?Graphical user interface
