Have a look at this: COM port made simple with VB.NET
There is a LPT class attached, it should be as simple as using the class to open/write bytes/close. Getting bytes from string can be done with one of the System.Text.Encoding and its GetBytes method.
Another option perhaps not very elegant is to execute DOS commands where you redirect output to LPT1 (using ">LPT1")
I can't help you any more now, but I will probably get hold of a parallel port printer and try it out some day.
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