Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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  Description:  Device Post      [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
                                    -♦-