Operating System (OS)
When you start up the computer the boot up storage at which the BIOS versions manufacturer and data are displayed on the monitor is called

Bootstrap
Power on self test (POST)
Kernel loading
System configuration

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Operating System (OS)
Addressing structure

performs indicated operations on two fast registers of the machine and leave the result in one of the registers.
None of these
are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.
All of these
defines the fundamental method of determining effective operand addresses

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