Presentation on theme: "System Setup CGS2564. What Happens When You Start up a Computer? BIOS Basic Input Output System A set of programs stored in ROM Contain instructions on."— Presentation transcript:
What Happens When You Start up a Computer? BIOS Basic Input Output System A set of programs stored in ROM Contain instructions on how to get started 1. Power-On Self Test POST System checks its hardware 2. Bootstrap loader Loads the operating system from disk “Boots up”
What Happens When You Start up a Computer? How does it “know” 1. What hardware it’s supposed to have? 2. Which disk to boot from? Information is stored in “memory” CMOS RAM How to access and change this information? System setup utility Stored in ROM
CMOS Special type of memory chip Stores information even when the computer is off Complimentary Metal Oxide Semiconductor Requires low power supplied by battery
System Setup Program Supplied by BIOS manufacturer Varies by brand/version Little standardization Can be accessed during startup After POST Before OS loaded from disk How to access Function key(s) DEL key Key combinations CTRL-ESC CTRL-ALT-ESC Etc.
Why Access the CMOS Settings? Get information CPU type and speed Service tag number Record information in case disaster strikes Computer cannot boot without this information! Change configuration after adding new hardware Today – usually detected automatically Set the boot drive sequence Boot from the hard drive first instead of floppy drive Security Set boot-up password Power Management Different from Control Panel settings Convenience Automatically turn on Num Lock Turn off PC speaker
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