The Printer Port - 2
Each of the data lines of the printer port can be turned ON, or OFF using an output command in the form:
<out> <address> <value>
where ...
the "<out>" command depends upon the programming language being used.
the "<address>" is either 888, or 956 (888 is the most common value)
the "value" is determined by the data line you want to turn ON: