USB/COM1 adapter problem

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I have an old pen plotter which works from the com port with ACAD.  I use an
old Toshiba laptop to run it.  I have a new HP laptop without a com port.  I
purchased a USB to COM port adapter but it does not work.  It communicates
and draws some of it right but also puts in a lot of spurious lines.  I
tried the adapter on the Toshiba with exactly the same bad results.  The HP
has XP home and the Toshiba has XP Pro.

Anyone have a similar experience and perhaps found a solution?  I'm
wondering if a different brand adapter might work or is that just the nature
of the beast?

TIA for any help


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