Operating System (OS)
What is the name of the operating system which was originally designed by scientists and engineers for use by scientists and engineers?

OS/2
None of these
UNIX
MS DOS
XENIX

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Operating System (OS)
The instruction 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.
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".
None of these
is a hardware memory device which denotes the location of the current instruction being executed.

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Operating System (OS)
Memory

is the device where information is stored
is a device that performs a sequence of operations specified by instructions in memory.
None of these
is typically characterized by interactive processing and time-slicing of the CPU
is a sequence of instructions

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