Lecture 6 I- Computer Essentials Cont'd PDF

Computer Skills & Programming Concepts I UEC01 – PCD104 – PCC104 – HGCP101 Lectures 1-6 Course Coordinator: Assoc. Prof. Mohamed Ismail Badawi 0  2 PUA – Computer Center – UEC01  Comp...

Computer Skills & Programming Concepts I UEC01 – PCD104 – PCC104 – HGCP101 Lectures 1-6 Course Coordinator: Assoc. Prof. Mohamed Ismail Badawi 0  2 PUA – Computer Center – UEC01  Computer Skills & Programming Concepts I UEC01 – PCD104 – PCC104 – HGCP101 I. Computer Essentials Lectures 1-6 Course Coordinator: Assoc. Prof. Mohamed Ismail Badawi PUA – Computer Center – UEC01 Course Coordinator: Assoc. Prof. Mohamed Ismail Badawi Instructors: ▪Eng. Mohamed Ahmed Taha ▪Eng. Maher Habashy ▪Eng. Angy Saleh ▪Eng. Yasser Abd El Aziz ▪Eng. Reham Refaat ▪Eng. Nehal Essam 4 PUA – Computer Center – UEC01 Lecture 6 5 PUA – Computer Center – UEC01  3. Output devices  Display Devices  Monitor & Display Screen  Touch screen: Input / Output at the same time.  Wearable Displays  Project images from a mobile device to a display screen built into glasses  Touch and Gesture Capabilities  Kiosks and portable gaming devices  Mobile phones and media tablets  Liquid Crystal Displays (LCDs)  Use charged liquid crystals between sheets of glass or plastic  Light Emitting Diode (LED) Displays  Currently used to backlight LCD panels  Projection devices  are useful for displaying presentations to a group of people. 6 PUA – Computer Center – UEC01 Output devices cont’d  Printers  Impact Printers (Dot Matrix)  Non-Impact Printers  Ink-Jet Printers use liquid ink  Laser Printers use toner  Special Purpose Printers  Barcode, label, and postage printers Laser Printer  Photo printers  3D printers  Speakers and headphones 7 PUA – Computer Center – UEC01 Storage 1. Hard Drive 2. Optical Discs 3. Flash Memory 4. Other Types of Storage Systems  Network Storage (Remote Storage)  Cloud Storage Systems(Online Storage)  Smart Cards (Credit Cards)  Magnetic Tape 8 PUA – Computer Center – UEC01 Storage System Characteristics  Storage System consists of a storage device and a storage medium(media):  Storage Medium: hardware where data is stored Ex: DVD disc, flash memory card, etc.  Storage Devices: where storage medium is inserted, it is typically identified by a capital letter C:, D:, …etc. Ex: DVD drive, flash memory card reader, etc.  Storage system Can be internal, external, or remote.  Storage Media are non nonvolatile  Types of Storage Technology Used 1. Magnetic (conventional hard drives) 2. Laser beam (optical discs) 3. Electrons (flash memory media) 9 PUA – Computer Center – UEC01  1- Hard Drives Used to store most programs and data It can be encrypted The data stored on this external hard drive is accessed via fingerprint scanner Can be Internal or External  Internal hard drives  Permanent storage devices located inside the system unit  Removed only if a problem develops  External hard drives  Commonly used to transport large amounts of data from one computer to another  Portable external hard drives are smaller and easier to transport  Almost connected with a USB connection although some may be wireless 10 PUA – Computer Center – UEC01  2-Optical Discs  A storage that stores data optically, read from and written to using laser beams.  Used for backup purposes and for storing and transporting music, photos, video, etc.  Recording data onto disc is called burning.  Can be  Read-only: Can be read from, but not written to, by the user. i.e. CD-ROM, DVD-ROM and BD-ROM (Blu-Ray Disc)  Recordable: Can be written to, but cannot be erased and reused. i.e. CD-R, DVD-R, DVD+R, BD-R Discs  Rewritable: Can be recorded on, erased, and overwritten just like magnetic discs i.e. CD-RW, DVD-RW, DVD+RW, and BD-RE Discs 11 PUA – Computer Center – UEC01 Optical Discs Capacity 12 PUA – Computer Center – UEC01 3-Flash Memory Storage Systems  Chip-based storage medium that represents data using electrons  Used in Solid-State Drives (SSDs) and hybrid hard drives.  Flash memory chips embedded into products, such as  Portable digital media players, digital cameras  Handheld gaming devices, GPS devices, mobile phones  Sunglasses and wristwatches  Types of flash memory  Flash Memory Cards: A small card containing one or more flash memory chips can be Read by flash memory card reader  USB Flash Drives: Designed to be very small and portable, Self-contained unit that plug into and is powered by a USB port 13 PUA – Computer Center – UEC01  Computer categories Computers are classified based upon size, speed, cost, portability, number of simultaneous users and typical use:  Embedded computers: Embedded into a product and designed to perform specific tasks or functions for that product.  Mobile computers: Small devices with some type of built-in computing or Internet capability that run on batteries, Such as:  Laptop, Tablet, PDA  Mobile feature phones (Cell phones, Satellite phones)  Smartphones are cell phones with operating system allowing user to install application such as word and adobe PDF and have GPS.  Microcomputers  Personal computer (PC): Small computer used by one person, Such as: desktop-case, tower-case, or all-in-one  Minicomputers: Multi-users, medium-sized computer used to host programs and data for a small network.  Midrange server 14 PUA – Computer Center – UEC01 Computer categories cont’d  Mainframe computers Multi-users, Larger, more expensive, and more powerful than Minicomputers, (for large organizations, hospitals, banks, universities)  Supercomputers Fastest, most expensive, most powerful type of computer (for satellites, weather forecast, oil exploration, scientific research) 15 PUA – Computer Center – UEC01  How to buy your computer? Factors affecting computer performance: CPU speed, storage capacity, video graphic display CPU speed: how fast the computer will run, depends on clock speed measured in MHz or GHz, number of CPU core, bus speed, and cache size. Storage capacity  RAM size is measured in MB (mega bytes) or GB (Giga bytes) and its speed is measured in NS (Nano seconds).  Hard Disk storage is measured in Gbytes and its speed is measured in milliseconds (MS).  Windows also uses Swap files on the hard disk a lot to simulate extra memory , so logically a faster hard disk you have a faster PC will run. Back 16 PUA – Computer Center – UEC01