Chap 08 System Software

Chap 08 System Software - Chapter 8 Operating Systems and...

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Chapter 8 Chapter 8 Operating Systems and Utility  Operating Systems and Utility  Programs Programs
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Software Two General Categories Applications software  Programs used to perform specific tasks  for users System software Programs that control the overall  operation of the computer and its devices Acts as interface between the user,  applications software and hardware Two types of system software Operating systems Utility programs Instructions that tell the computer how to perform tasks
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System Software –  Operating System Operating System (OS) Set of programs that coordinate all activities among  hardware resources Software platform, e.g. Windows, Mac…  Allow users to run applications software Usually resides on the hard disk On handheld devices may reside on a ROM chip Most operating systems perform similar functions
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System Software –  Operating System Functions - Start-Up Startup Booting Process of starting or restarting a computer Cold versus warm boot The Kernel is loaded from the hard disk into memory Also called the  Core  of the Operating System It provides essential services required by other parts of the operating  system and applications programs It manages memory and devices, maintains the clock, schedules and starts  applications, assigns resources Memory resident Other parts of the OS that are not used as often are non-resident
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System Software –  Operating System Functions - Start-Up When booting, messages may be displayed on  the screen including:  BIOS version and copyright notice Total amount of memory Devices detected and tested Other messages
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System Software –  Operating System Functions-  Start-Up Startup Basic Cold Boot Steps 1. Electrical signal sent to motherboard and other components 2. Processor resets and looks for BIOS ROM chip 3. BIOS conducts Power On Self Test (POST) 4. POST results compared to data on CMOS chip; any new devices detected 5. If POST completes successfully, BIOS looks for system files 6. Operating System files load into memory and execute; kernel is loaded; OS  in memory takes control of the system 7. OS displays the desktop and loads configuration information and  additional OS files, and finally executes any programs in the Startup  folder
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System Software –  Operating System Functions - Start-Up The Boot drive Drive from which PC starts; looks  for OS Usually the hard drive If boot drive is damaged and the  computer cannot boot from it,  computer can be booted from an  emergency boot disk (either a CD or  floppy) Contains small set of system files 
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Chap 08 System Software - Chapter 8 Operating Systems and...

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