2.2 types of computer software
DESCRIPTION
2.2 Types of Computer Software. Prepared by Desmond C.S. Wong. Operating System. An OS is a program (some may say a set of programs) that coordinates all the activities of a computer. Microsoft Windows XP. from Amazon.com. Apple Mac OS X. from Apple Computer. Redhat Linux. - PowerPoint PPT PresentationTRANSCRIPT
2.2 Types of Computer Software
Prepared by Desmond C.S. Wong
Operating System
An OS is a program (some may say a set of programs) that coordinates all the activities of a computer
Microsoft Windows XP
from Amazon.com
Apple Mac OS X
from Apple Computer
Redhat Linux
from computerworld.jp
Linux command-mode
from rr.sans.org
Sun Solaris Unix
from xfce.org
Microsoft DOS
from members.tripod.com/suzuki2go
Microsoft Windows DOS Prompt
Starting a computer
POWER
1. Turn on the power
2. The processor finds the ROM chip that contains the BIOS
from rojakpot.com from dualprocessorcomputers.com
3. The BIOS performs POST
from dn.redwoods.cc.ca.us
from wown.info
4. The results of the POST are compared with data in the CMOS chip
from nuwaveinc.com
= ?
5. The BIOS looks for the system files in one of the booting drives
from all-about-pc.de
6. the system files and the #kernel of the OS load into RAM from hard disk/booting drive
from macaddit.com
10011010101111001101
…
from Amazon.com
7. the OS loads configuration information and displays the interface on the screen
Functions of OS
User interface Job scheduling Program
management Single user/single
tasking Multitasking Multi-user Multiprocessing
Data management Device management Security of access Resources managem
ent Error detection and re
sponse
Types of OS
Standalone MS-DOS, Windows 9X, Windows NT Workstation, Wi
ndows 2000 Prof, Windows ME, Windows XP Home & Prof. Ed., MacOS
Network Netware, Windows NT and 2000 Server, Windows .N
ET Server, UNIX, Linux Embedded
Windows CE, Pocket PC 2002, Palm OS
Utility programs
A utility program is a type of system software that performs a specific task, usually related to managing a computer, its devices, or its programs
Applications software
Application software consists of programs that perform specific tasks for users Word processing Spreadsheet software Database software Presentation graphics software Game Desktop publishing software Anti-virus scanner Web browser and etc.
Forms of applications software
Packaged software Custom software Freeware Public domain software Shareware Software from ASP
Data files
Text document txt, rtf, doc, pdf
Image files bmp, gif, jpeg, png, tiff
Sound files midi, mp3, ra, wav
Video files avi, mov, mpeg, rm
Presentation files ppt
Spreadsheet files xls
Database files dbf, mdb
Relationship among OS, applications s/w and data files
UserApplication Software
Operating System
Data Files
http://www.med.yale.edu/caim/manual/graphics/graphics/8bit_displays.gif
http://www.med.yale.edu/caim/manual/graphics/graphics/1_bit_display.gif