INT 1A - Disk Spool II v1.83 - INSTALLATION CHECK
        AH = ABh
Return: AH = BAh if installed
            AL = pending INT 1A/AH=ADh subfunction if nonzero???
            ES = code segment
            ES:BX -> name of current spool file
            ES:SI -> current despool file
            CL = 00h despooler is disabled
               = 41h despooler is enabled
            CH = 00h spooler is disabled
               = 41h spooler is enabled
            DL = 00h despooler is currently active printing a file
               = 41h despooler is standing by
            DH = 00h ???
               = 41h ???
            DI = 0000h ???
                 0001h ???
Note:   Disk Spool II is a shareware disk-based print spooler by Budget
          Software Company
SeeAlso: AH=ACh,AH=ADh