Hello, I am looking for an adapter that converts a parallel port on the computer to a USB port. I see plenty of the ones that work the other way around, e.g. convert a USB port into parallel for use with printers.
A serial port to USB port is an alternative solution for my problem .
If either exists, let me know mfr & model, I would be grateful.

Yes, their are adapters of this kind that are available in the market that can convert parallel ports to a USB port. It is true that you may have difficulty finding such adapters very easily.