scribble had a question on how to get usbpoker working - I waisted an awful lot of time trying before achieving success myself. Here is method I followed:
Add a new entry to libusb.inf changing 24 for old blue to 28 (if new blue, 27 of new red). This time it is just a simple device - not a composite like the old blue so get rid of &MI_00 at end of line and delete the second line. Drmn4ea if you are reading perhaps you could add some documentation with your poker in the zip file pointed to in Links thread. In the long process I followed, I ended up downloading a new release of libusb but do not think it was necessary. Here is my line for a 27 PV2:
"Pure Digital PV2, Bulk Interface, Version 11/18/2004, 20041118"=LIBUSB_DEV, USB\VID_0DCA&PID_0027
When plugging device for the first time (I use XP), in response to new hardware wizard I selected manual (not automatic) and then browse, going to location of my the updated libusb.inf and then clicking ok, next and finish.
Create a binary file (I recommend XVI32 - google and download) containing:
4d 61 4d 53 1d ba ab 1d 00 00 27 00 80 00 00 52 and 15 00s for a total of 31 bytes.
Invoke usbpoker, select open, then bulkout, browse to your binary, click send it, wait for message saying write 31 bytes, then click bulkin, enter length 2600000, wait for message read 25nnnnn bytes, close it, disconnect, delete shot, rename angerRcvd.text and now your ready for another shot.
Hope all this works for you scribble, and rather than trying for green FFs, it may be more informative to follow morcheeba's latest suggestion on a controlled linear extended dynanmic range if you have a meter and other necessary equipment.