A coincidence data acquisition system, incorporating a position sensitive detector and a custom-built data acquisition card installed in an IBM-PC 486 computer, has been implemented in a coincidence experiment in which scattered electrons and Auger electrons are detected in coincidence. Three analog-to-digital converters (ADCs) are used to digitize all the timing and energy information, and custom-designed and written control software is used to accumulate the data, display it in real time, and store it in expanded memory. The new system has ben used to measure the energy and angular distribution of Auger electrons ejected from argon after electron impact ionization.