IBM Assembler Question:
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registers(0-15) ,where they are going be resides does that mean here is it resides whether real or virtual memory? and why? then why we are assign even registers(0 to 6) for FP operations?

Answer:

Registers are part of the CPU logic and should not be
confused with memory real or virtual. The question is
about as sensical as asking where the uterus resides in a
man. Also, general purpose registers 0--16 are an
entirely different breed that the floating point
registers. As for the numbering, a decision made by the
manufacturer's design people.

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