27 March Management Information Systems 3. Introduction to Information Systems Technology by Asst. Prof. Wichai Bunchua

27 March OverviewOverview The evaluation of information systems technology Computer hardware Programs Data

27 March The evolution of Information Systems Technology Origins The first generation The second generation The third generation The fouth generation Information systems today

27 March Computer Hardware Input hardware Processing hardware Storage hardware Output hardware

27 March Input Hardware Keyboard Terminals Mouse Scanner Voice input OCR Barcode reader

27 March Processing Hardware CPU charateristics System memory Data bus or processor channel Three categories of processing hadware: Mainframe computer, Mini computer, Microcomputer Processor archtecture

27 March Storage Hardware Disk storage Diskettes or floppy disks Hard disks Tape storage Optical storage CD-ROM WORM Erasable optical disks

27 March Output Hardware Printers Character printers, line printers, and page printers Impact printers and nonimpact printers Video displays Voice output

27 March ProgramsPrograms Two major groups of programs Systems programs Application programs Programming Languages

27 March Systems programs Operating System Utility Programs Communcations control programs

27 March Application Programs Horizontal market application programs Vertical Market Application Programs Custom-Developed Application programs

27 March Programming Languages Machine languages Assembly languages High level languages Nonprocedural languages

27 March DataData Data representation File processing Sequential file organzation Direct-access file organization Problems with file processing Database processing

27 March Data Representation Bits Bytes Charater codes ASCII EBCDIC Fields or data items Records Files