Maintenance and repair 337 Microcomputers 333 Upgrading 99 Certification 88 Computer technicians 88 Examinations 84 Electronic data processing personnel 58 Equipment and supplies 46 Study guides 32 Computing Technology Industry Association 23 Computer input-output equipment 10 Computers 10 IBM-compatible computers 7 Design and construction 6 Amateurs' manuals 4 IBM Personal Computer 4 Operating systems (Computers) 4 Computers and older people 3 IBM Personal computer 3 Microcomputer 3 Amateurs manuals 2 Compatible computers 2 Computer interfaces 2 Computer security 2 Data recovery (Computer science) 2 Handbooks, manuals, etc 2 IBM 2 IBM microcomputer 2 IBM-compatible computer 2 Laboratory manuals 2