Operating System (OS)
Addressing modes

are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.
All of these
performs indicated operations on two fast registers of the machine and leave the result in one of the registers.
defines the fundamental method of determining effective operand addresses
None of these

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Operating System (OS)
Assembler language

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

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Operating System (OS)
A critical region is

a program segment where shared resources are accessed
a program segment that often causes unexpected system crashes
none is the above
a program segment that has not been proved bug-free
one which is enclosed by a pair of P and V operations on semaphores

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