Language Processors
Multiprogramming was made possible by

input/output units that operate independently of the CPU
neither (a) nor (b)
both (a) and (b)
operating systems

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Language Processors
The system/370 assembler language

allows the programmer to write base registers and displacements explicitly in the source program
allows multiple programs to reside in separate areas of core at the same time
is used to remember which of the general-purpose registers are currently available as base registers, and what base addresses they contain
is a term that refers to the control programs of an operating system

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