Lakhasly

The text details various computer input and output devices, including keyboards, mice, speech recognition, scanners, and various card readers. Output devices covered are display screens (LCD, LED, OLED, Plasma), printers (laser and inkjet), plotters, and 3D printers, including bioprinting. Storage and playback devices like digital audio players and e-book readers are also mentioned. Finally, the text classifies computer systems (general-purpose, special-purpose, single-user, multiple-user), discusses portable computers (smartphones, notebooks, ultrabooks, tablets), and concludes with an overview of data centers and factors driving their growth.

Common Personal Computer Input Devices

Keyboard and mouse •

•Speech-Recognition Technology •Motion-Sensing Input Devices •Scanning Devices

Optical Data Readers•
•Magnetic Ink Character Recognition (MICR) Devices أجهزة
) MICR)
Input Devices

Magnetic Stripe Cards •
Chip Cards •
Smart Cards •
• Contactless Payment Cards
• Point-of-Sale (POS) Devices
• Automated Teller Machine (ATM) Devices
• Bar-Code Scanners
• Radio Frequency Identification (RFID) Devices • Pen Input Devices
Touch Screens •

• Display Screens
• Used to show output from the computer
• Liquid crystal display (LCD): several layers of charged liquid crystals to create light and images( LCD):

• Light-emitting diode (Led): An LCD display that uses light-emitting diodes as backlight
• Organic light-emitting diode (OLED): use organic compounds with electric current to produce bright, sharp images( OLED):

• Plasma: light up appropriate phosphors on the screen to emit light and
اcolor
•Printers and Plotters
• Two main types of printers
-Laser ليزر -Inkjetالنافثه
• Mobile print solutions enable users to wirelessly send documents, email messages and attachments, presentations, and other documents from any smartphone, tablet, or laptop to any mobile-enabled printer in the world تمكن حلول الطباعة المحمولة المستخدمين من إرسال المستندات ورسائل البريد الإلكتروني والمرفقات والعروض التقديمية والمستندات الأخرى لاسلكيا من أي هاتف ذكي أو جهاز لوحي أو
كمبيوتر محمول إلى أي طابعة تدعم الهاتف المحمول في العالم
• Plotters are used for general design work تستخدم الراسمات لأعمال
-Blueprints, schematics, and drawings of buildings مخططات ومخططات ورسوماتالمباني
• 3D Printers
• 3D technology takes a three-dimensional model of an object stored on a computer and sends it to a 3D printer to create the object using strands of a plastic filament or synthetic powder3 تأخذ تقنيةD نموذجا ثلاثي الأبعاد لكائن مخزن على جهاز كمبيوتر وترسله إلى
طابعة ثلاثية الأبعاد لإنشاء الكائن باستخدام خيوط من خيوط بلاستيكية أو مسحوق اصطناعي
• Commonly used by aerospace firms, auto manufacturers, and other design-intensive companies
Bioprinting •

• Uses 3D printers to build human parts and organs from actual human cells
  • Digital Audio Players
  • Device that can store, organize, and play digital music files
  • MP3: a popular format for compressing a sound sequence into a very small file while preserving the original level of sound qualityMP3: ت E-Book Readers •
  • An electronic book (e-book) is the digital media equivalent of a conventional printed
  • Usually have the capacity to store thousands of books
  
  Computer System Types
  • General classification
  Special-purpose computers •
  General-purpose computers •
  Two major groups of general-purpose computers • Single-user computers • Multiple-user computers •
  Portable Computers
  • Smartphones الهواتف
  • Allow users to place calls, download and run apps, send and receive text messages and email, view documents and files, take and send photos and videos, get driving directions via GPS, browse Web sites, and create playlists of digital tunes)
  Mobile Computers •
  • Notebooks and ultrabooks are smaller than laptops
  ultrabooks
  • Tablet computers are portable, lightweight computers with or without a keyboard
  Data Center
  Data center •
  • A climate-and-access-controlled building or a set of buildings that houses the computer hardware that delivers an organization’s data and information services Factors driving growth in data centers:
  • Demand for additional computing capacity
  • Need for additional storage capacity
  Some organizations are consolidating data centers from many locations down to just a few locations