http://www.ftdichip.com/Products/FT245BM.htm

Circuit Celler just recently ran an article on USB/parallel... using the
above chip.

It may give you some ideas...

Rolf

On Fri, 4 Sep 2009 16:42:24 +0200, "Peter Feucht"
<p.feucht@palmed-medizintechnik.de> wrote:
> Hi, folks,
> 
> I have to establish a bidirectional (!) communication between a laptop
> with
> USB port and a printer with 8-Bit-parallel port. Usually I would buy a
> ready
> made USB-LPT-converter, but I have to alter some of the transmitted data
> in
> a specific way. So I thought of building such a USB-LPT converter by
using
> an USB-PIC.
> 
> Has anybody done this before?
> 
> Any starting information for me?
> 
> Thanks in advance and best regards
> 
> Peter
> 
> 
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