IT_Chapter_7B

PC Operating Systems

• Microsoft Windows is the most popular

– Installed more than other OS combined

– Installed on about 95% of computers

– Apple and Linux represent the other 5%

• DOS

– Disk Operating System

– Single user single-tasking OS

– Command line interface

– 16-bit OS

– Powerful

– Fast

– Supports legacy applications

• Windows NT

– Designed for a powerful system

– 32-bit OS

– Very stable

– Windows NT Workstation

• Single user multi tasking OS

– Windows NT Server

• Multi user multi tasking OS

• Network operating system

• Windows 9x

– 95, 98, and Millennium Edition (Me)

– 32-bit OS

• Supported 16-bit programs well

– Very pretty not stable OS

– Still found in large corporations

– 95 introduced the Start button

– 98 introduced active desktop

– Me improved multimedia software

• Windows 2000

– Look of 9x with NT stability

– Optimized for office and developers

– Application software ran very well

– Entertainment software ran very poorly

• Windows XP

– Microsoft’s newest desktop product

– Different look from 2000

– Many different versions

– Digital multimedia support was enhanced

– Communications was enhanced

– Mobile computing became a priority

• UNIX

– Runs on all computer types

– 32- or 64-bit

– Very stable and fast

– Command-line interface

– Can cost thousands of dollars

• Linux

– Free or inexpensive version of UNIX

– 32-bit OS

– Very stable and fast

– Most flavors are open source

– X Windows GUI

• Command line interface is available

• Macintosh operating systems

– OS X

– Based on FreeBSD Linux

– Very stable and easy to configure

– Only runs on Mac hardware

NOS Features

• Network operating system

• Fast and stable

• Runs on servers

• Multi-user and multitasking OS

• 32- or 64-bit

• File and print sharing

– Users access the same files

– Hundreds of users use a printer

– Different OS can interact

• Data integrity

– Backups copies data onto tape

– RAID copies data onto other drives

• Redundant Array of Inexpensive Disks

• Relies on two or more hard drives

• May speed access to data

• Data security

– Access to data can be restricted

– Access to server resources is controlled

– Audits can be kept

Networking Operating Systems

• NT Server

– Same core as NT Workstation

– Security added

– Multi user capability added

– RAID support included

• Windows 2000 Server

– Same technology as 2000 workstation

– Active Directory (AD)

• Central database of server resources

• Simplifies network management

– Distributed programs supported

– Server Standard Edition

– Advanced Server Edition

– Data Center Edition

• Windows 2003 Server

– Designed to compete with UNIX

– XP like interface

– Better support for XP computers

– MS .NET framework supported

– Distributed programs are supported

– Server Standard Edition

– Data Center Edition

• UNIX for servers

– Oldest NOS in widespread use

– Stable secure and fast

– Main OS for Internet and Web

– Large organizations depend on UNIX

• Linux for servers

– Popular in small businesses

– Stable, fast and inexpensive

– Linux’s popularity is growing

• Devices have EOS built in

• Cell phones, PDAs, medical equipment

• Stable and fast

Embedded Operating Systems

• Windows XP embedded

– Based on Windows XP

– Customized for each device

• Windows CE

– Not based on a desktop OS

– Customized for each device

– PDA and cell phones

– Microsoft Automotive will run in cars

• Palm OS

– Standard on Palm PDA

– First PDA OS for consumers

– Can be found on cell phones

• Pocket PC

– Developed to compete with Palm

– Not customizable

– Interacts securely with business networks

– Can control PCs through PC

• Symbian

– Found in smart cell phones

– Games, Instant Messaging, Internet

– Full color display