Performance of a Prototype FADC Electronics System for the HIRES Fly's Eye

We have instrumented one mirror unit of the HIRES prototype with both a Sample and Hold ( S/H ) and a FADC readout system. The relative performance of the two systems was compared by analyzing simulated cosmic ray showers generated with a high power UV laser. The performance of the FADC system was found to be consistent with expectations, and superior to the S/H system.