狠狠撸

components of a data communication system touch pad touch screen light pen joystick magnetic ink character reader bar code reader image scanner track ball keyboard mouse input devices output unit storage unit processing unit input unit computer organization hardware in home in arts in airline in police department in law in healthcare headset input-output devices line printer band printer chain printer dot-matrix printer daisy wheel printer non-impact printers impact printers thermal printer inkjet printer laserjet printer types of printers printers inkjet plotter flatbed plotter drum plotter types of plotters plotters hardcopy devices webcam microphones mini-computer digital computer analog computer integrated circuits transistors pascaline analytical engine relay switch vaccum tubes generations of computers history of computers data vs. information types of data electronic data processing computer definition characteristics of computer information data data communication system importance distributed processing datacommunication data communication components networks and distributed processing digitizer in stores in engineering in training in education in industries in banks in offices applications of computers special purpose computers general purpose computers types of computers w.r.t purpose super computers mainframe computers mini-computers micro-computers types of computers w.r.t size cost and speed hybrid computers analog computers digital computers types of computer w.r.t working principal types of computer micro-computer programming flowchart algorithm problem solving freeware customized software commercial software application software language translators firmware utility software device drivers operating system types of system software system software software dvd cd pen drive solid state disk flash drive blue-ray disk digital versatile disk tree topology ring topology star topology bus topology mesh topology topology network criteria full duplex half duplex simplex world wide web wan man lan types of network transmission mode characteristics of a data communication system data communication assembly language machine language high level languages low level languages computer language l2 cache l1 cache level-3 cache level-2 cache level-1 cache cache memory memory address register memory data register memory buffer register program counter instruction register data register counter register base register accumulator register special purpose registers general purpose registers types of registers registers primary memory units of memory memory hierarchy computer memory compact disk optical disks zip disk floppy disk hard disk magnetic disk magnetic tape magnetic storage devices secondary storage eeprom erasable programmable memory eprom programmable read only memory prom rom read only memory dynamic ram static ram dram sram random access memory ram l3 cache