Operating System (OS)
Operating system

All of these
provides a layered, user-friendly interface
None of these
enables the programmer to draw a flowchart
links a program with the subroutines it references

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Operating System (OS)
The Memory Address Register

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.
None of these
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 hardware memory device which denotes the location of the current instruction being executed.

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