- Basic Input Output System
- Motherboard has a BIOS
- Other devices may also have a BIOS (ex. printer, network router, video card)
- Typically stored on a ROM or Flash RAM chip
- Complementary Metal Oxide Semiconductor
- Type of RAM used for storing exceptions to BIOS settings
- Powered by motherboard battery full-time
Accessing BIOS Setup
- Watch for a message at startup telling which key to press
BIOS Setup Utility
Exiting BIOS Setup
- Refer to message onscreen for instructions
- F10 is typical for saving changes
- Esc is typical for discarding changes
Floppy Drive Configuration
- BIOS does not typically detect floppy drives
Hard Drive Configuration
- Usually Plug-and-Play, but manual setup is possible; refer to label on disk drive
Boot Configuration
- Set boot order (CD, Hard, Floppy, etc.)
Plug and Play
- When Plug and Play OS is assumed, BIOS relinquishes control of many hardware resources
- Reset Configuration resets BIOS assignments of resources from its own Plug and Play
- Assign IRQ for USB support enables USB devices to work before OS loads
Integrated Peripherals
- Legacy parallel and serial ports
- Set addresses or enable/disable
Power Management
- Can be configured in BIOS or in OS
- OS is preferable if possible
- Power management turned on in both places can result in conflict
Recover from Bad BIOS Changes
1.Find reset jumper on motherboard
2.Change its position
3.Power system on for 5 to 10 seconds
4.Power system off
5.Reset jumper
Install BIOS Updates
- Download update from manufacturer’s Web site
- Check instructions on Web site
- Many types of updaters
*Command line utilities
*Windows-based utilities
*Boot disks
Replace BIOS Chip
- Pull chip with chip puller tool
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