102 Class 03: Startup Sequences and BIOS - nataliabdallah/codefellows-ops-reading-notes GitHub Wiki

102 OPS | Home | README.md | Portfolio | ← | →

HowToGeek What is BIOS, Learn Computer Science - What is BIOS:

BIOS is the most basic of the computer's processes and has tons of information at the start up of the computer we can learn about

What is the BIOS?

  • Basic Input Output System - purpose is to locate and load the operating system into the main system memory, RAM (Random Access Memory)
  • AkA the booting process

Use analogies from your previous background to explain what happens during the booting process?

  1. CPU initiates booting process by sending first start-up BIOS
  2. BIOS initiates booting sequence
  3. Operating System completely loads into the main memory RAM
  4. booting process is complete

What is the “Power On Self Test”?

  • BIOS performs self test to check:
  • CPU
  • RAM
  • Storage Drives
  • Graphics card
  • all function correctly

What is the CMOS?

  • Complementary Metal Oxide Semiconductor
  • a type of tech used to produce integrated circuits (IC Chips)
  • stores critical data used by the operating system during boot up.
  • Devices with CMOS: -- microprocessors, batteries, and digital camera image sensors

What is the CMOS battery?

  • CMOS Battery is a little battery that powers the CMOS when system is turned off to protect critical memory because CMOS is a Non-Volatile RAM (NVRAM)- stores user settings
  • BIOS settings are maintained after computer is turned off.

Things I want to know more about

  • How to read and maneuver through all the settings of BIOS and start up system