Microcomputers Maintenance and repair 336 Upgrading 145 Certification 104 Computer technicians 100 Examinations 100 Design and construction 92 Data processing 86 Equipment and supplies 73 Programming 69 Electronic data processing personnel 66 Computers 57 Microprocessors 55 Computer interfaces 46 Programmable controllers 34 Study guides 34 Computer networks 29 Buses 25 Computing Technology Industry Association 23 Electric circuit analysis 23 Electric power systems 23 Information technology 22 Numerical calculations 22 Computer software 21 Engineering mathematics 21 Computer input-output equipment 20 Programmable peripheral interfaces 19 Circuits 17 Electronic digital computers 17 Amateurs' manuals 16