Notes Class 03
Stands for Basic Input Output System. Is a System utility program which loads the operating system when computer is switched on. The operating system acts as an interface between computer system hardware components and the application programs. The BIOS also performs some initial diagnostic tests POST and initialize the hardware during the booting process. The main job of the BIOS is to locate and load the operating system in to the main system memory RAM.
There isn't much of a connection between this and electrician work. I suppose it could be like if I was the BIOS for my project. I test all the power units and outlets before the power comes on to them. Or even like a circuit breaker. main power might be running but until that breaker is turned on after I check everything, there will be no power / no information.
The “Power On Self Test” checks the computer systems internal hardware components for compatibility , connection and ensures that no errors exist before loading the operating system.
Is a small battery powered RAM memory which retains the user settings and other data required during the booting process. The CMOS stands for “Complementary Metal Oxide Semiconductor.” The CMOS is a Non-Volatile RAM or CMOS RAM because it is powered by the CMOS battery when system is switched off. This information includes the system time , date , system hardware settings , user preferences and password for your computer.
The CMOS is a battery powered semiconductor chip ( memory ) inside computer that stores the information needed during the computer booting process. The average life of the CMOS battery is around five years depending upon the usage. Same battery used in a watch.
If replacing the CMOS battery clears the computer, is there a way to save that Data? for instance the password? or would you need to wipe the computer? Why is five years the replacement period, when watches seem to never need to be replaced? There was a lot of info about the different errors that can happen, i would like to know more because that seemed to be a little overwelming.
Other notes: The BIOS and CMOS work together during the computer booting process . Functions Of ROMBIOS
- To Check the power supply to the computer system.
- To check that essential internal components such as RAM and external peripheral devices are connected and working.
- To initiate the computer system booting sequence .
- To provide and load the initial basic set of device drivers .
- To locate the operating system and load into the RAM.
- To handover the system control to the operating system once the OS is fully loaded and operational.
Features Of BIOS
- BIOS – Basic Input Output System.
- ROMBIOS main Function Is to Load the Operating System.
- BIOS is Placed Inside ROM Chip Called ROMBIOS.
- ROMBIOS Also Loads Initial Set Of Drivers.
- BIOS Chip Is Powered By CMOS Battery.
- ROMBIOS Configuration Is Saved Due To CMOS Battery
- BIOS Finally Handover Control To the Operating System
