Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Set PSP Address Interrupt
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  Interrupt:   21h     Function:   50h
 
  Title:       Set PSP Address
 
  See also:    Program Segment Prefix, Get PSP Address
 
  Description:
 
     Sets 256-byte data area as new program segment prefix (PSP). The
     area must be properly initialized with valid PSP data.
 
     This function does not recover from errors and must be used with
     care.
 
     Input                            Output
 
     AH = 50h                         None
     BX = New PSP segment address
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