Operating System Functions
How
does a personal computer boot up?
Next
p. 395 Fig. 8-4
Step 1. Power supply sends signal to com-ponents in system unit
Step 4. Results of POST are compared with data in
CMOS chip
Step 2. Processor accesses BIOS to start computer
Step 3. BIOS runs tests, called the POST, to check components such as mouse, keyboard, and adapter cards
Step 5. BIOS looks for system
files in floppy disk drive or CD/DVD drive, and then hard
disk
Step 6. Kernel (core) of operating system loads into RAM
Step 7. Operating system loads configuration information and displays desktop on
screen
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