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The Experiment Data System(EDS) is the on board processing system for the Proportional Counter Array(PCA) and All Sky Monitor (ASM) on the X-ray Timing Explorer (XTE). We discuss the advantages and limitations some of the available data modes of the EDS for processing PCA data, including Binned, Event, FFT and Single-Bit modes. We also present EDS data taken during the first performance test which utilized 3 of the 5 Flight detectors connected with the flight EDS on the XTE S/C.