Other Types of Input Peripherals Digital Cameras Digital Video Cameras Scanners Optical Character Recognition (OCR) software allows scanned text to be used or edited in a word processing program.
Other Types of Input Peripherals (cont.) Modem Fax Modem Both are input and output devices.
Central Processing Unit (CPU) Heart of the computer through which all instructions and information flow.
Internal Memory ROM: Read only memory- permanent memory. RAM: Random-access memory-temporary memory. Computer stores all your work on RAM until you save it on disk!
Internal Memory (cont.) Increase RAM: Increase the size of applications that can be run. Increase number of applications that can be open at the same time. Increase in the file size that can be processed.
Internal Memory (cont.) RAM: expressed in units of a 1000 bytes (K) or kilobyte. expressed in units of 1 million bytes (MB) or megabyte. expressed in units of 1 billion bytes (GB) or gigabyte. Also used to define storage capacity.
External Memory (cont.) Current Floppy disk: 3 ½ square, hard plastic-increased protection. Can be write protected. 1.44 MB
External Memory (cont.) Disc drive: function is to save and retrieve data from the floppy disk.
External Memory (cont.) Key Chain Drives: also known as a USB drive, flash drive, or disk-on-key. This is a plug-and- play portable storage device that uses flash memory and is lightweight enough to attach to a key chain. MB to GB
External Memory (cont.) Other disks: Iomega Zip and Jaz drives and Imation SuperDisk. Greater storage capacity and faster access when opening files.
External Memory (cont.) Optical Storage Devices Videodisk: the first optical device-1978. CD-audio: digital format-1983. Photo-CD
External Memory (cont.) Optical Storage Devices CD-ROM: Began as read-only technology, but has evolved to CD-R or RW (rewriteable). Stores approximately 700 MB of data. DVD-R or RW : Digital versatile disk: Stores approximately 4.7GB of data. DS will store twice as much data.
Output Peripherals Display information Video monitor: high resolution. Video projectors: display large projected image. Overhead display panel (LCD): designed to sit on the stage of an overhead projector.
User Interface Interaction between human and machine. Programming instructions in simple language. Interprets your actions and executes the instructions.
User Interface (cont.) MS-DOS (Microsoft-Disk Operating System): text- based interface. Examples: Operating Systems Apple introduced the first graphic user interface or GUI (gooey) in 1984.
User Interface (cont.) Original Windows: ran once DOS was loaded. Indirectly controlled computer. Current OS is Vista. Windows 7 available soon. Macintosh/Apple OS X: directly controls computer. Current OS is Snow Leopard. All graphic interfaces use icons rather than text. Examples: Operating Systems
What do you want to accomplish ? The software should drive the hardware. Instead of asking yourself: What hardware should I use? Ask: What hardware is available for what I want to do?