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

Cache Memory
The hard drive
CMOS
ROM

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Operating System (OS)
Most of the microcomputer's operating systems like Apple DOS, MS DOS and PC DOS etc. are called disk operating systems because

they are available on magnetic tapes
None of these
they are memory resident
they are partly in primary memory and partly on disk
they are initially stored on disk

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