Int 2F Fn 00  U - Dos 2.x Only Print.com - Submit File For Printing        [c]

   AH = 00h
   DS:DX -> opened FCB (see #1034 at INT 21/AX=0Fh)

Return: AH = number of files currently in print queue
   AL = status
       00h file successfully added
       01h queue is full
   ES:BX -> print queue (10 FCBs; first byte of FFh indicates unused)
   ES:DX -> currently-printing FCB (if DX=FFFFh, none printing)

Notes: DOS 2.x PRINT.COM does not chain to previous INT 2F handler
   values in AH other than 00h or 01h cause PRINT to return the number of
     files in the queue in AH

See Also: AH=01h"PRINT",AX=0102h