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Basic Input Output System. The BIOS is the part of a PC used to get from the point of powering on the computer to beginning to execute an OS. It does things like update CPU microcode, setup the PCI and ISA busses, initialize the IDE and keyboard controllers, etc. There are also BIOS services provided to programmers to do things like access the disk and display things on the screen, but those aren't really used much outside of DOS.. If you are interested in programming using services provided by the BIOS, you may want to look for Ralph Brown's Interrupt list. The BIOS usually has a built in utility for configuring features of the motherboard chipset. This would include things like setting the time, telling it which IDE devices you want to enable (and possibly what they are), whether or not you have a floppy drive, access timings for RAM and busses, etc..
24 pages link to
BIOS
:
WakeOnLanNotes
ThinkpadNotes
KeyDrive
FireBird
GPT
BootLoader
SMART
LiloErrorCodes
VBE
SoekrisPXEBootHowto
SysLinux
WlugKnoppix
DPMI
I/O
BootDisk
BootSector
PXE
PartitioningSuggestions
FunnyApplicationErrorMessages
MozillaFirefox
PS/2
TroubleshootingStartUp
AlsaNotes
TFTPInstallHowto