bas7qck.hlp (Table of Contents; Topic list)
ON COM Statement
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ON COM(n%) GOSUB {linenumber | linelabel}
 
    ■ n%              An integer expression that indicates one of the
                      COM (serial) ports:  1 = serial port 1;
                                           2 = serial port 2.
    ■ linenumber or   The first line of the event-handling routine to
      linelabel       branch to when characters are received at a
                      communications port.
 
See Also    ◄COM►    ◄EVENT►