A computer controlled data collection and analysis system was built and used at the Lawrence Berkeley Laboratory's Bevatron to measure the charge asymmetry in the decay KL0→π±μ±ν. The system records the states of 144 scintillation counters arranged into twelve hodoscopes, and it can test the operation of each counter. Information from pulse height analyzers, a digital voltmeter, time-to-amplitude converters, event clock, and scalers was recorded with each event. Using a PDP-9 computer, over 25 million events were recorded on magnetic tape during the tuning and data phases of the experiment. A CRT, programmed to display histograms and geometrical models of the experimental information as it was accumulated, was a valuable diagnostic tool allowing rapid visual assessmenr of both broad hodoscope and specific counter anomalies. The computer's power was greatly expanded by the addition of external control registers, hardware priority resolvers, event matrix logic, additional programmable flags, and input-output transfer request lines, in addition to software priority levels and the usual program interrupt line and peripherals. Inexpensive dual discriminators, nanosecond coincidence gates, testing circuits and new packaging methods were all used in developing this system.