Jason sent me the latest Thunder Laser DSP setup documentation. It explains a few mystery features like the foot switch and an output to control exhaust and/or assist air. I will probably incorporate relay drivers into a new new PCB I am working on for the assist air and exhaust.
Bart "If you didn't build it, you will never own it."
I took a look at the air assist / blower section where they recommend a board with relays.
The one thing that I am wondering is what that is hooked up to on the DSP... I didn't see anything except for the HL and LL output for the laser that change when the laser fires.