Citizen Printer

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Notes •Expansion Ports- Connect a Peripheral device to an expansion card. •RAM- Random Access Memory •What is RAM? Every time you start your operating system, launch a program, or open a file, the relevant program code and/or data is loaded into a RAM. That’s why you see RAM listed in the system requirements for the software you buy. If you have more RAM, you can open more files or programs at once and load bigger files. •RAM capacity is rated in terms of megabytes and gigabytes. •RAM is not permanent; when the computer is turned off; all information stored in RAM is lost. •ROM- Read only memory •ROM is a storage chip that typically contains hardwired instructions for use when a computer starts (boots up). The instructions—contained in a small program called the BIOS (basic input/output system)—load from ROM and start up the hard disk. •ROM is memory that you cannot erase or write on. •CMOS-Complementary Metal Oxide Semiconductor •CMOS is a special kind of memory maintained by battery after you turn the computer off. CMOS also maintains the internal clock. Every time you turn on your computer, the BIOS looks in CMOS for the settings you selected and configures your computer accordingly. •Input Hardware- Sends Data to RAM •Keyboard-The most common input device. •Mouse- A small palm sized input device that you move across a flat surface to control the movement of the pointer on a screen. •Trackball- A pointing device like a mouse only with the ball on the top of the device instead of the bottom. You rotate the ball to move the insertion point. •Scanner- A scanner lets you input information already on a piece of paper directly to the PC. •Touchpad- A flat rectangular surface that senses the movement of a finger on its surface to control the movement of the insertion point. •Pen Input- Allows you to use a pen to enter data or select processing options without using a keyboard. •Touch screen- A touch screen allows you to touch areas on the screen to enter data. •Voice Input- Allows you to enter data and issues commands to the computer with spoken words. •Digital Camera- Record photographs in the form of digital data that can be stored on a computer. •Electronic white board- captures anything drawn on a special whiteboard. •Output Hardware-Receives information from RAM and presents it in a readable form such as printed report or color graphics. •Monitor-screen, display, CRT •Printer-produces a printout or hard copy. •2 Categories of Printers •Impact- Prints by striking a linked ribbon against paper. •Non-Impact- Forms characters by other means thank striking a ribbon against paper; prints higher quality text and graphics than an impact printer. •Dot-Matrix Printer •Prints using a series of dots to form the characters. •Inexpensive •Low quality •Noisy •Inkjet Printer- Uses a nozzle that sprays drop of ink onto the page to form characters. •Laser Printer •Works similar to a copying machine by converting data from the computer into a beam of light, forming the images to be printed. •Produces highest quality printouts. •Most expensive; quiet, popular among businesses. •Storage Hardware •Storage- Stores data and programs when they are not being processed. •Also called secondary or auxiliary storage. •3 types: hard disks, floppy disks, and CD/DVD-drives. •Computer process and store data using codes designed expressly for electronic data. One of these codes is the binary number system, which has only two digits: 1 and 0. Anna Taylor

Public Comments

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