Power On Self Test instructions are part of the BIOS that is stored in EPROM. Some of the parameters used by the EPROM are stored in the BIOS CMOS chip.
POST(power on self test)
The first step in the booting process is POST (power-on self-test).
P.O.S.T. is the way it should read. Stands for "POWER ON SELF TEST" which is what the computer firmware does when it is turned on, checking for the correct settings for the computer hardware. POST stands for Power on Self Test
Power On Self Test
POST stands for Power-On Self-Test. As far as what program initiates it, just turning the PC on will cause it to run. It is an auto-running program that is designed to start by itself the moment you turn on your computer.
Self (Power-On Self Test)
Power on self test in electronics equipment or computers is done to validate if all the critical parts of the device are working as desired when it is turned on. Any thing wrong internally or on an interface is typically reported as a failure on power on self test. What all is tested depends on how elaborately the power on self test has been designed. - Neeraj Sharma
Power on self test
Power-on self-test
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Power On Self-Test