Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
FSETPM Instruction
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  Title:    Set Protected Mode
            80287 Only
 
  Syntax:   FSETPM
 
  See also: .287
 
  Description:
 
     Sets the 80287 to protected mode. The instruction and operand
     pointers are in the protected-mode format after this instruction.
     On the 80387/486, FSETPM is recognized but interpreted as the FNOP
     instruction, since the 80386/486 processors handle addressing
     identically in real and protected modes.
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