Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Int 15h Function 86h
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  Interrupt:   15h     Function:   86h
 
  Title:       Delay
 
  See also:    Event Wait
 
  Description:                                               [AT] [PS/2]
 
     Suspends the calling program for a specified interval in
     microseconds.
 
     Input                            Output
 
     AH = 86h                         If function successful
     CX:DX = Microseconds to wait     (wait was performed)
                                        Carry flag: clear
 
                                      If function unsuccessful
                                      (wait was not performed)
                                        Carry flag: set
                                    -♦-