A computerized Data Acquisition System conceived and built by LNETI/DEE in cooperation with Department of Cardiology of Hospital Santa Cruz, and its application to processing and representation of cardiac precordial maps (MAPCARD SYSTEM), was described. A description was made about the evolution on cardiac maps, their main areas of interest, pointing to future ways. With this economic and easy to use system, important perspectives of hospital utilization are opened, in the fields of non invasive diagnostic and clinical research technics.