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retail USB-to-parallel converter are often using Prolific PL2305 chip and associated drivers. **broken link removed**
However, as far as I experienced, they are not suitable for legacy LPT operation, e. g. operating an JTAG programming adapter. They support Windows printer driver but don't emulate parallel port hardware. I can't say for sure, that this would be impossible at any case, I only can say, that it's apparently impossible with usual driver.
For bit I/O connected to USB, the FTDI FT2232 could be used, they have also a lot of programming examples. But it won't work with a Xilinx, Altera, Lattice, Ponyprog, whatever parallel port adapter.
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