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  Interrupt:   15h     Function:   21h     Subfunction:   00h
 
  Title:       Read POST Error Log
 
  See also:    Write POST Error Log
 
  Description:                                                    [PS/2]
 
     Returns error information that was accumulated during the most
     recent power-on self-test (POST). The error log consists of
     single-word entries. The first byte of an entry is the device
     error code; the second is the device identifier.
 
     This function is not available on the PS/2 Models 25 and 30.
 
     Input        Output
 
     AH = 21h     If function successful
     AL = 00h       Carry flag: clear
                    AH = 00h
                    BX = Number of POST error codes stored
                    ES:DI = segment:offset of POST error log
 
                  If function unsuccessful
                    Carry flag: set
                    AH = Status
                         80h = Invalid command
                         86h = Function not supported
                                    -♦-