INT 1A - Disk Spool II v2.07 - FUNCTION CALLS
        AH = D0h
        AL = function code
            01h enable spooler and despooler
            02h enable spooler only
            03h enable despooler at beginning of file
            04h disable the despooler
            05h disable the despooler and spooler
            06h clear the spool file
            08h inhibit the popup menu
            09h enable the popup menu
            0Ah ??? (called by Disk Spool's INT 21 handler)
            0Bh disable the spooler
            0Ch start despooler after last successfully printed document
            0Dh start despooler at the exact point where it last left off
            0Eh pop up the menu
            0Fh ???
            11h start new spool file??? (called by Disk Spool's INT 21 handler
                        when a program terminates)
            14h ???
            15h delete despool file and reset ???
            16h ??? (writes something to unknown file)
            17h ??? (writes something to despool file, then reads something
                        else and ???)
            18h ??? (reads something from despool file, and then ???)
            19h ??? (creates/truncates spool file)
            20h clear file pointed to by the despooler
            21h ??? (writes something to unknown file)
            22h ??? (writes something to spool file if spooler/despooler using
                        same file)
            23h ??? (opens/creates unknown file, then ???)
            30h ???
            31h ???
            32h beep
            33h append CRLF to spool file???
            34h ???
            35h ???
            36h ???
            37h append CRLF to spool file and start a new spool file???
            38h ???
            51h ??? (called by Disk Spool's INT 21 handler)
            52h ??? (called by Disk Spool's INT 21 handler)
            57h ???
SeeAlso: AH=ADh