PLXSW-SIO4 Update 1.2

This update to the PLXSW-SIO4 driver updates the following isues:

1. Fixed DMA operations not working on SIO4B family of card
2. Fixed inability to get same interrupt multiple times in a row


To use this update, simply replace the files SIO4 Driver C.dll and SIO4 Driver C.lib in your
application directory and recompile the test code with the new SIO4 Driver C.lib file.

