Operating System (OS)
Assembler language

is a mnemonic form of machine language
None of these
is usually the primary user interface
is quite different from the SCL interpreter
requires fixed-format commands

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Operating System (OS)
The instruction register

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.
None of these
contains the address of the memory location that is to be read from or stored into.
is a hardware memory device which denotes the location of the current instruction being executed.

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