Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Int 15h Function 85h
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  Interrupt:   15h     Function:   85h
 
  Title:       SysReq Key
 
  Description:                                               [AT] [PS/2]
 
     Invoked by the ROM BIOS keyboard driver when the SysReq key is
     detected.
 
     Input                                 Output
 
     AH = 85h                              If function successful
     AL = Key status                         Carry flag: clear
        = 00h (if key make (depression))     AH = 00h
        = 01h (if key break (release))
                                           If function unsuccessful
                                             Carry flag: set
                                             AH = Status
                                    -♦-