So... I also used PCI based NI (Digital/Analog I/O) cards in the past (around the year ~2000), which then were supported by "comedi" (open source linux data acq

So... I also used PCI based NI (Digital/Analog I/O) cards in the past (around the year ~2000), which then were supported by "comedi" (open source linux data acquisition drivers). On the other hand, I recently got a few USB based I/O boxes from NI where no documentation on the USB protocol (or, god forbid, even open source drivers) exist.