Operating System (OS)
Operating system

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

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Operating System (OS)
The instruction register

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 group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
is a hardware memory device which denotes the location of the current instruction being executed.
contains the address of the memory location that is to be read from or stored into.

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