Int 1A Fn E0  - Disk Spool Ii V4.0x - Enable/disable                       [c]

   AH = E0h
   AL = subfunction
       01h enable spooler
       02h disable spooler
       03h enable despooler
       04h disable despooler
   CL = printer port (01h COM1, 02h COM2, 05h LPT1, 06h LPT2)

Return: AH = status
       00h successful
       F0h printer port not managed by Disk Spool II
       FFH failed

Note:  this function is also supported by Vertisoft's Emulaser utility ELSPL,
     as that is a licensed version of Disk Spool II

See Also: AH=A0h,AH=E1h,AX=E301h,AX=E401h