Operating System (OS)
Assembler language

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

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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 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.
None of these
is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.

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