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Answer Posted / sysprog
The content of a base register is added to a displacement, and/or to the content of an index register, thereby to determine the address of the source or destination memory location upon which the instruction is to act.
When 0 is specified in the base regester position in an instruction, it is not interpreted by the assembler or the machine as a base register or as referencing register 0; in that position it means no base register for that instruction.
A program base register is used in specifying addesses of memory areas within the program, including instructions and storage areas.
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