Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Get PSP Address Interrupt
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  Interrupt:   21h     Function:   51h
 
  Title:       Get PSP Address
 
  See also:    Program Segment Prefix, Get PSP Address
 
  Description:
 
     Returns the segment address of a current program segment prefix
     (PSP).
 
     Input        Output
 
     AH = 51h     BX = PSP segment address
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