Boums,
If your device's sample rate is 10 MHz, this will also be the highest throughput of the device, with 1 bit per sample. Unfortunately, I believe the 6509 will only be able to output 5 bits of data every 500 nanaseconds. You will have to have a card with a higher clock speed to do more.
For an example that would implement this functionality, check out the "Digital - Continuous Output.vi" example in the example finder of LabVIEW.
VanCamp
