Microcomputers 1,097 Maintenance and repair 341 Upgrading 146 Certification 104 Computer technicians 100 Examinations 100 Programming 100 Design and construction 94 Data processing 93 Equipment and supplies 73 Electronic data processing personnel 66 Computers 57 Microprocessors 57 Computer interfaces 47 Programmable controllers 34 Study guides 34 IBM microcomputers 33 Computer networks 31 Numerical calculations 26 Buses 25 Engineering mathematics 25 Computing Technology Industry Association 23 Electric circuit analysis 23 Electric power systems 23 Information technology 22 Computer input-output equipment 21 Computer software 21 IBM-compatible computers 20 Programmable peripheral interfaces 19 Microcomputer 18