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BIOS

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BIOS

Basic Input/Output System
- BIOS chip located on motherboard
Initializes CPU & memory
- Makes sure you have all hardware components needed to load an operating system
  - POST
    - Power on self test
      - If any of the hardware checks fail a message pops up
    - Once POST finished it looks for boot loader to start operating system
      - Computer loads operating system normally
Legacy BIOS
- Older/ Traditional BIOS
- Operating system talked to hardware through BIOS rather than accessing it directly
  - Limited hardware support i.e modern network, video/ storage devices
UEFI BIOS
- Unified Extensible Firmware Interface
  - Modern BIOS
    - Replaces Legacy BIOS
- Can boot from larger storage systems
  - Support FAT and removable devices
    - Provides Pre-Boot environment
      - Without OS allows to browse, backup & remote diagnostics
Non Volatile BIOS Memory
- Stores BIOS configuration
- Saved to CMOS (flash)
  - Doesnt need constant power source