Operating System (OS)
Part of the POST process is to ensure that the test of essential peripheral device coincides with the hardware configuration that stored in

CMOS
The hard drive
Cache Memory
ROM

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Operating System (OS)
The advantage of a command processor running only built-in commands is:

flexibility to the users in running lists of commands by simply collecting them in named batch command files
None of these
users can create system programs and run them as commands
the command set being common across different hardware configurations
the processing is much faster than would other-wise be the case when user defined commands are used

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