Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 15h Function 91h
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  Interrupt:   15h     Function:   91h
 
  Title:       Device Post
 
  Description:                                               [AT] [PS/2]
 
     Invoked by the ROM BIOS fixed disk, floppy disk, network, and
     keyboard drivers to signal that I/O is complete and/or the device
     is ready.
 
     Input                                        Output
 
     AH = 91h                                     AH = 00h
     AL = Device type
        = 00h-7Fh Serially reusable devices
        = 80h-BFh Reentrant devices
     ES:BX = segment:offset of request block
             for device types 80h-BFh
                                    -♦-