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OPEN "COMn: optlist1 optlist2" [FOR mode] AS [#]filenum% [LEN=reclen%]
 
  ■ n           The communications port to open (1 = COM1, 2 = COM2)
  ■ optlist1    The most-often-used communications parameters:
                    [speed] [,[parity] [,[data] [,[stop]]]]
                Defaults: 300 baud, even parity, 7 data bits, 1 stop bit.
  ■ optlist2    Up to 10 other optional, less-often used data
                communications parameters.
  ■ mode        One of the keywords OUTPUT, INPUT, or RANDOM (the
                default).
  ■ filenum%    Any unused file number between 1 and 255, inclusive.
  ■ reclen%     The size of a random-access-mode buffer (128 bytes is
                default).