Perhaps a place to start:
UM245R FTDI
http://ca.mouser.com/ProductDetail/FTDI/UM245R/?qs=sGAEpiMZZMvYU0Oh5y3R5kupuvuS8tlk

2009/9/4 Peter Feucht <p.feucht@palmed-medizintechnik.de>:
> 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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