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
is a term that refers to the control programs of an operating system
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

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Language Processors
A non-relocatable program is one which

consists of a program and relevant information for its relocation
All of these
cannot be made to execute in any area of storage other than the one designated for it at the time of its coding or translation
can itself perform the relocation of its address-sensitive portions

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