Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Int 13h Function 10h
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  Interrupt:   13h     Function:   10h
 
  Title:       Get Drive Status
 
  Description:                                          [PC] [AT] [PS/2]
 
     Tests whether the specified fixed disk drive is operational and
     returns the drive's status. This function is supported on fixed
     disks only.
 
     Input                           Output
 
     AH = 10h                        If function successful
     DL = Drive                        Carry flag: clear
        = 80h-FFh fixed disk           AH = 00h
 
                                     If function unsuccessful
                                       Carry flag: set
                                       AH = Status
                                            See: Int 13h Function 01h
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