Operating System (OS)
The instruction register

None of these
is a hardware memory device which denotes the location of the current instruction being executed.
contains a copy of the designated memory location specified by the MAR after a "read" or the new contents of the memory prior to a "write".
is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
contains the address of the memory location that is to be read from or stored into.

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Operating System (OS)
Which of the following refers to the associative memory?

the address of the data is generated by the CPU
the data are accessed sequentially
the address of the data is supplied by the users
there is no need for an address i.e. the data is used as an address
None of these

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