INT 2F - DOS 3+ PRINT.COM - SUBMIT FILE FOR PRINTING
        AX = 0101h
        DS:DX -> submit packet (see below)
Return: CF clear if successful
            AL = status
                01h added to queue
                9Eh now printing
        CF set on error
            AX = error code (see below, also INT 21/AH=59h)
SeeAlso: AX=0102h

Format of submit packet:
Offset  Size    Description
 00h    BYTE    level (must be 00h)
 01h    DWORD   pointer to ASCIZ filename (no wildcards)

Values for PRINT error code:
 01h invalid function
 02h file not found
 03h path not found
 04h out of file handles
 05h access denied
 08h print queue full
 09h spooler busy
 0Ch name too long
 0Fh invalid drive

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