I've got a little thingy I made myself with a Minimus AVR, to replace a parallel port to BBC Micro cable I bought about 12 years ago, when PCs still had parallel ports. USB cable connects PC to AVR, also providing power, and a bunch of wires connects AVR to BBC.

The AVR pretends to be the original unmodified PC software, translating things to and from the USB protocol that the modified PC software now uses (which was pretty straightforward to do using libusb).

The AVR is 5V, so it just connects directly.