Lesson 1 Introduction To OS

CT 102
INTRODUCTION TO
OPERATING SYSTEMS
Presented by Ms. Vinna Niña E. Orozco
TABLE OF CONTENT
Introduction to Operating Systems
Definition of OS Purpose of OS
Evolution of OS Different OS Platform

INTERFACE
An OS is a program which acts as an
OPERATING
interface between computer system
users and the computer hardware.
SYSTEM User Friendly Environment

It provides a user-friendly environment in
which a user may easily develop and
execute programs.
An operating system is a program that Software vs. Hardware

manages the computer hardware. It Otherwise, hardware knowledge would
be mandatory for computer
also provides a basis forapplication programming.
programs and acts as an intermediary So, it can be said that an OS hides the
complexity of hardware from
between the computeruser and the uninterested users.
computer hardware.
EXAMPLE
1. The user issues a save command whileusing

an application program such as word
processor.
2. The word processing application signals the
operating system that a document must be
saved to a disk.
EXAMPLE
3. The operating system communicates the

document to the disk device driver for saving.
EXAMPLE
4. The disk device driver controls the

disk drive as it saves the document.
PURPOSE OF
OPERATING
SYSTEM
Next slide
PURPOSE OF
OPERATING SYSTEM
Environment User Friendly
provide an environment within the
hardware so that users can execute their the user-friendly operating
programs smoothly without mishaps or system provides ease and
glitches. It also serves as a platform where
other programs can run.
accessibility
PURPOSE OF
OPERATING SYSTEM
System
For the system, the operating system
sustains the efficiency in the management
and use of the computer system and its
resources
As an important figure,
the operating system acts as a
it handles the user interface. As

the computer is booted, the first
point of contact will be the
RECEPTIONIST
operating system.
It is considered the welcoming

committee which assists the
user all throughout his/her
contact with the hardware.
it provides servicesfor managing
DISPATCHER the queue of programs

scheduled for processing and
activation.
it controls the access to the

system and files. It prohibits
unauthorized users access to
SECURITY the system. It also prevents user

from accidentally or
GUARD intentionally
each other.
interfering with
As a manager, it handles the

efficient allocation of resources.
A resource is any object that
MANAGER can be allocated within the

system.Examples are
processoruse, input/output
devices,files and memory (RAM).
it directs the passage of data

through the CPU and guides the
CPU when to look in memory,
TRAFFIC when to read or write on the

data storage, when to displayon
OFFICER screen the data or provide a

hard copy using the printer.
it monitors the users who logs-

on to the system, what kinds of
resources are utilized by each
ACCOUNTANT user, and what resources are

requested by each user.
1st gen 2nd gen
1945-1955 1945-1955
NO OS, PURE HARDWARE
BATCH OPERATING SYSTEM
Single User Operating System
developed for the ·An operating
·Programmers earliest computers that
system controlled
operated the used punched cards or
paper tapes as input and by one user at a
machine
is entered in “batches”. time who dealt with
themselves
one set of input
devices.
EVOLUTION OF
OPERATING SYSTEM
3rd Gen
Multi- programming
1965-1985 Operating Systems
Time Sharing Operating System
Multiuser Operating System

·The operating system that ·Also called Interactive
allows multiple software systems.
·Allowed a single ·A system that allows
computer– often processes to run
simultaneously. each user to interact
mainframe – to deal with directly with the
simultaneous input, ·Also called multi-tasking
operating system which operating system via
output, and processing commands entered from
request from many can either be cooperative
multitasking or preemptive a keyboard.
users.
multitasking.
EVOLUTION OF
OPERATING SYSTEM
PERSONAL
COMPUTER OS is less complicated than
OPERATING SYSTEMS mainframe operating
system
·OS used for personal computers ·Operating system designed

which supports single user for desktop, notebook,or tablet
environment. computer and usually used by
a single user.
The market we reach

is not wide enough
4th Gen
1965-1985 Embedded Operating System Network Operating System (NOS)
Real Time Operating System (RTOS)

·Also known as Server
·An OS implanted or rooted Operating Systems,
inside other piece sof Distributed Operating
·Type of operating equipment to control their System or Loosely
system that uses time as operation. Coupled System
a key parameter for its
operation.
EVOLUTION OF
OPERATING SYSTEM
5TH GEN
PARALLEL ·Recognize opportunities for parallel
execution, send the separate tasks to
OPERATING SYSTEM the appropriate processor, and
coordinate their concurrent
execution, all in a transparent way.
·An OS that will manage systems Also known as Multi-processor

containing hundreds or even Operating Systems or tightly
thousands of processors. coupledSystem.
Examples are Linux, Unix,Windows NT

OPERATING SYSTEMS
PLATFORM
MICROSOFT
WINDOWS Category
·usually categorized as 16 bit OS
environment, hybrid 16/32 bit OS, 32 bit
OS environment, and 64 bit OS.
Example
Examples are Windows XP, Windows Vista,
Windows 2000, Windows 98, Windows ME
and Windows CE.
OPERATING SYSTEMS
PLATFORM Written by
·A Unix-like operating systems built
around the Linux Kernel written by Linus
LINUX
Torvalds.
Open Source
·Developed as an open sourceand free
software.
Examples
Examples are BSD, GNU, MINIX,Reactos,
Haiku.
OPERATING SYSTEMS
PLATFORM Written by
·A Unix-Based operating system
introduced by Sun Microsystems
SOLARIS Open Source

·Developed originally as a proprietary
softwarebut now considered a mixed closed
source / open source. Its opensourced
software is OpenSolaris
Examples
Examples are Solaris10, Solaris 9, Solaris 2.5
OPERATING SYSTEMS
PLATFORM Apple Inc.
·Graphical user interface based
operating systems developed by Apple
MAC OS
Inc. for their Macintosh line of computer
systems.
Open Source
·Compatible with both PowerPC and Intel
Processors.
Considered a mixed closed source / open

source. Its opensource software is Darwin.
Examples
·Examples are Mac OS X, AppleDOS, A/UX,

A/ROSE,Rhapsody, MkLinux, Taligent, and Lisa
OS.
THANK YOU
arigathanks~

Lesson 1 Introduction To OS

Uploaded by

Copyright:

Available Formats

Lesson 1 Introduction To OS

Uploaded by

Document Information

Original Title

Copyright

Available Formats

Share this document

Share or Embed Document

Sharing Options

Did you find this document useful?

Is this content inappropriate?

Copyright:

Available Formats

Lesson 1 Introduction To OS

Uploaded by

Copyright:

Available Formats

CT 102

Evolution of OS Different OS Platform

SYSTEM User Friendly Environment

An operating system is a program that Software vs. Hardware

1. The user issues a save command whileusing

3. The operating system communicates the

4. The disk device driver controls the

it handles the user interface. As

It is considered the welcoming

it provides servicesfor managing

DISPATCHER the queue of programs

it controls the access to the

SECURITY the system. It also prevents user

As a manager, it handles the

MANAGER can be allocated within the

it directs the passage of data

TRAFFIC when to read or write on the

OFFICER screen the data or provide a

it monitors the users who logs-

ACCOUNTANT user, and what resources are

Multiuser Operating System

·OS used for personal computers ·Operating system designed

The market we reach

Real Time Operating System (RTOS)

·An OS that will manage systems Also known as Multi-processor

Examples are Linux, Unix,Windows NT

SOLARIS Open Source

Considered a mixed closed source / open

·Examples are Mac OS X, AppleDOS, A/UX,

You might also like