3.1+Hardware

__**//The computer system//**__ __**//Input and output devices//**__
 * IT concepts to address in this topic**
 * **Types of computers: personal digital assistant (PDA), laptop, desktop computer**
 * **MAC address**
 * **Motherboard**
 * **Central processing unit (CPU), microprocessor, clock speed: for example, megahertz (MHz), gigahertz****(GHz), terahertz (THz)**
 * **Primary storage: read-only memory (ROM), random-access memory (RAM)**
 * **Secondary storage: optical, magnetic, flash memory: for example, USB (universal serial bus) flash drive**
 * **Bit, byte, kilobyte (KB), megabyte (MB), gigabyte (GB), terabyte (TB), petabyte (PB), exabyte (EB),****zettabyte (ZB), yottabyte (YB)**
 * **Character encoding: ASCII (Unicode and American Standard Code for Information Interchange)**
 * **Ports**
 * **Keyboards, mice, touch pads**
 * **Optical mark recognition (OMR), optical character recognition (OCR), magnetic ink character** **recognition (MICR), radio frequency identification (RFID), radio tag, bar code scanners, magnetic stripe** **readers**
 * **Microphones**
 * **Smart card readers**
 * **Webcams, digital cameras, digital video cameras**
 * **Sensors, probes, real-time data collection**
 * **Composite devices: for example, game controllers**
 * **Touch-sensitive devices: for example, pads**
 * **Printers, monitors, speakers, projectors**
 * **CD-ROM (compact disc read-only memory), DVD (digital versatile/video disk) readers and burners**