Language Processors
The system/370 assembler language

allows the programmer to write base registers and displacements explicitly in the source program
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
allows multiple programs to reside in separate areas of core at the same time

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Language Processors
Assembler is

a program that places programs into memory and prepares them for execution
a program that automate the translation of assembly language into machine language
a program that accepts a program written in a high level language and produces an object program
is a program that appears to execute a source program as if it were machine language

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