Any of the PIO(PCI) series cards should work. Oly the PIO-16/16T(PCI)H has been tested.
Basically, here are the list of likely candidates:
16 input / 16 output
PIO-16/16T(PCI)H - TTL (5v input/open collector output to 30v)
PIO-16/16L(PCI)H - Low voltage (12v - 24v input/output)
PIO-16/16H(PCI)H - High voltage (24v - 48v input/output)
32 input / 32 output
PIO-16/16T(PCI)H - TTL (5v input/open collector output to 30v)
PIO-16/16L(PCI)H - Low voltage (12v - 24v input/output)
PIO-16/16H(PCI)H - High voltage (24v - 48v input/output)
The "bi-directional" cards are not supported by the PIO plugin.
Steve