Language Processors
The system/370 assembler language

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

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Language Processors
A loader is

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

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