These military-developed curriculum materials consist of three volumes of self-paced, individualized training manuals for use by those studying to be electronic computer systems technicians. Covered in the individual volumes are the following topics: computer principles (number sytems, computer circuits, computer components, computer units, input-output units, and computer power supples); general maintenance (supervision and training, general maintenance, equipment identification, and testing equipment); and system maintenance (adjustments, alignments, programming, and troubleshooting). Each volume contains a text with charts and diagrams as well as a workbook with objectives, assignments, review exercises and answers, and volume review exercises. (MN)