Language Processors
Multiprogramming was made possible by

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

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Language Processors
The system/370 assembler language

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 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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Language Processors
Terminal Table

contains all constants in the program
a permanent table which lists all key words and special symbols of the language in symbolic form
consists of a full or partial list of the tokens as they appear in the program. Created by Lexical analysis and used for syntax analysis and interpretation
a permanent table of decision rules in the form of patterns for matching with the uniform symbol table to discover syntactic structure

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