PC (Personal Computer) are dominanting in todays market of IT equipment because they have to offer wide compromise of price and abilities. There are a lot better and a lot of more expencive solutions (graphics work stations, main frame computers). There are also weaker of PC (IPOD, PocketPC). Structure of PC we'll consider in spirit of Von Neumann model aldo PC has components that Von Neumann couldn't predict (multimedia applications).



Basic Input unit today makes combination of tastature and mouse. Other input devices through which computer does big amounts of datas are scaner, digitalizer, ligh pen, digital photo-devices and cameras, A/D convertor, modems(transmit). As output devices, most used ones are monitors. Long time it was printer. Rest output devices are: plotter, NCR, D/A convertors, modems (sending).







Systems of mass memory storage are used for long time period archiving of big sizes of datas. Those are: HDD (Hard Disk Drive), CD-ROM (Compact Disk), DVD (Digital Versatel Disk), Streamers, MOD, JAZ, ZIP, LS120. Common thing is that monitors use extreme power supply so they don't consume power from power appling unit from PC.