Operating System (OS)
Assembler language

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

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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".
contains the address of the memory location that is to be read from or stored into.
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.

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