Presentation on theme: "Computers and Digital Basics Chapter 1. 1 Chapter 1: Computers and Digital Basics2 Chapter Contents Section A: All Things Digital Section B: Digital."— Presentation transcript:
1 Chapter 1: Computers and Digital Basics2 Chapter Contents Section A: All Things Digital Section B: Digital Devices Section C: Digital Data Representation Section D: Digital Processing Section E: Password Security
1 SECTION A Chapter 1: Computers and Digital Basics3 All Things Digital The Digital Revolution Convergence Digital Society
1 Chapter 1: Computers and Digital Basics4 The Digital Revolution social, political, and economic The digital revolution is an ongoing process of social, political, and economic change brought about by digital technology, such as computers and the Internet A constellation of technologies, including digital electronics, computers, communications networks, the Web, and digitization are fueling the digital revolution
1 Chapter 1: Computers and Digital Basics5 The Digital Revolution bits? bytes? Digital electronics use electronic circuits to represent data (bits? bytes?) Today, digital electronic devices include computers, portable media players such as iPods, digital cameras and camcorders, cell phones, radios and televisions, GPSs, DVD and CD players, e-book readers, and arcade games
1 Chapter 1: Computers and Digital Basics6 The Digital Revolution Household Ownership of Personal Computers in the U.S.
1 Chapter 1: Computers and Digital Basics7 The Digital Revolution Internet The second phase of the digital revolution materialized when the Internet was opened to public use –E-mail –Bulletin boards –Chat groups –Blogs –Online social networks
1 Chapter 1: Computers and Digital Basics8 The Digital Revolution A computer network is a group of computers linked by wired or wireless technology to share data and resources (what is the Internet?) The Web (www) is a collection of linked documents, graphics, and sounds that can be accessed over the Internet Cyberspace is a term that refers to entities that exist largely within computer networks Digitization is the process of converting text, numbers, sound, photos, and video into data that can be processed by digital devices
1 Chapter 1: Computers and Digital Basics9 Convergence Technological convergence is a process by which several technologies with distinct functionalities evolve to form a single product Convergence tends to offer enhanced functionality and convenience
1 Chapter 1: Computers and Digital Basics10 Convergence
1 Chapter 1: Computers and Digital Basics11 Digital Society Digital technologies and communications networks make it easy to cross cultural and geographic boundaries Anonymous Internet sites, such as Freenet, and anonymizer tools that cloak a person’s identity, even make it possible to exercise freedom of speech in situations where reprisals might repress it Citizens of free societies have an expectation of privacy Intellectual property Intellectual property refers to the ownership of certain types of information, ideas, or representations
1 Chapter 1: Computers and Digital Basics12 Digital Society Digital technology is an important factor in global and national economies, in addition to affecting the economic status of individuals economic interdependence Globalization can be defined as the worldwide economic interdependence of countries that occurs as cross-border commerce increases and as money flows more freely among countries Individuals are affected by the digital divide, a term that refers to the gap between people who have access to technology and those who do not Digital technology permeates the very core of modern life
1 Chapter 1: Computers and Digital Basics13 Quick Quiz 1.The ______________ is an ongoing process of social, political, and economic change brought about by digital technology, such as computers and the Internet. 2.True/False: Bulletin boards are personal journals posted online for general public access. 3._______ property refers to the ownership of certain types of information, ideas, or representations. a.Digital b.Intellectual c.Online d.Licensed Digital Revolution
1 SECTION B Chapter 1: Computers and Digital Basics14 Digital Devices Computer Basics Personal Computers, Servers, Mainframes, and Supercomputers PDAs, Portable Players, and Smart Phones Microcontrollers
1 Chapter 1: Computers and Digital Basics15 Computer Basics A computer is a multipurpose device that accepts input, processes data, stores data, and produces output, all according to a series of stored instructions
1 Chapter 1: Computers and Digital Basics16 Computer Basics Computer input is whatever is typed, submitted, or transmitted to a computer system Output is the result produced by a computer Data refers to the symbols that represent facts, objects, and ideas Computers manipulate data in many ways, and this manipulation is called processing –Central Processing Unit (CPU) –Microprocessor
1 Chapter 1: Computers and Digital Basics17 Computer Basics Memory Memory is an area of a computer that temporarily holds data waiting to be processed, stored, or output Storage Storage is the area where data can be left on a permanent basis when it is not immediately needed for processing (examples?) file A file is a named collection of data that exists on a storage medium The series of instructions that tells a computer how to carry out processing tasks is referred to as a computer program –Software
1 Chapter 1: Computers and Digital Basics18 Computer Basics A stored program is a series of instructions for a computing task can be loaded into a computer’s memory and executed by the computer to perform a task or tasks –Allows you to switch between tasks –Distinguishes a computer from other simpler devices Examples?
1 Chapter 1: Computers and Digital Basics19 Computer Basics Application software is a related set of computer programs that helps a person carry out a task and get work done on a computer System software allows the computer to operate (basic tasks) and monitor itself in order to function efficiently –Operating system (OS)
1 Chapter 1: Computers and Digital Basics20 Personal Computers, Servers, Mainframes, and Supercomputers A personal computer is a microprocessor- based computing device designed to meet the computing needs of an individual
1 Chapter 1: Computers and Digital Basics21 Personal Computers, Servers, Mainframes, and Supercomputers The term workstation has two meanings: –An ordinary personal computer that is connected to a network –A powerful desktop computer used for high- performance tasks
1 Chapter 1: Computers and Digital Basics22 Personal Computers, Servers, Mainframes, and Supercomputers A videogame console, such as Nintendo’s Wii, Sony’s PlayStation, or Microsoft’s Xbox, are not generally referred to as personal computers because of their history as dedicated game devices
1 Chapter 1: Computers and Digital Basics23 Personal Computers, Servers, Mainframes, and Supercomputers serverclient The purpose of a server is to serve client computers on a network (such as the Internet or a home network) by supplying them with data or application support mainframe A mainframe computer (or simply a mainframe) is a large and expensive computer capable of simultaneously processing data for hundreds or thousands of users supercomputer A computer falls into the supercomputer category if it is, at the time of construction, one of the fastest computers in the world –A compute-intensive problem is one that requires massive amounts of data to be processed using complex mathematical calculations What is an input/output-intensive problem?? Examples??
1 Chapter 1: Computers and Digital Basics24 Personal Computers, Servers, Mainframes, and Supercomputers
1 Chapter 1: Computers and Digital Basics25 PDAs, Portable Players, and Smart Phones A PDA (personal digital assistant) is a pocket-sized digital appointment book with a small qwerty keyboard or a touch- sensitive screen, designed to run on batteries and be used while holding it A handheld computer is essentially a PDA enhanced with features such as removable storage, e-mail, Web access, voice communications, built-in camera, and GPS A smart phone, which in addition to voice communication, includes features such as full qwerty keypad, text messaging, e-mail, Web access, removable storage, camera, FM radio, digital music player, and software options for games, financial management, personal organizer, GPS, and maps iPods and similar devices are classified as portable media players because their main strength is playing music, showing videos, and storing photos
1 Chapter 1: Computers and Digital Basics26 PDAs, Portable Players, and Smart Phones
1 Chapter 1: Computers and Digital Basics27 Microcontrollers A microcontroller is a special-purpose microprocessor that is built into the machine it controls Microcontrollers can be embedded in all sorts of everyday devices Examples?
1 Chapter 1: Computers and Digital Basics28 Quick Quiz 1.A (n) ______________ is a special-purpose microprocessor that is built into the machine it controls. 2.True/False: Just about any personal computer, workstation, mainframe, or supercomputer can be configured to perform the work of a server. 3.Any software or digital device that requests data from a server is referred to as a(n) _______. a.minicomputer b.client c.mainframe d.terminal microcontroller
1 SECTION C Chapter 1: Computers and Digital Basics29 Digital Data Representation Data Representation Basics Representing Numbers, Text, and Pictures Quantifying Bits and Bytes Circuits and Chips
1 Chapter 1: Computers and Digital Basics30 Data Representation Data representation refers to the form in which data is stored, processed, and transmitted Digital devices work with distinct and separate data (discrete, on/off) Analog devices work with continuous data
1 Chapter 1: Computers and Digital Basics31 Representing Numbers, Text, and Pictures Numeric data –Binary number system Character data –ASCII, Extended ASCII, EBCDIC, and Unicode Digitizing is the process of converting analog data into digital format Bit = Binary Digit –on or off, 1 or 0 Sound waves….. Images….
1 Chapter 1: Computers and Digital Basics32 Data Representation Extended ASCII?
1 Chapter 1: Computers and Digital Basics33 Quantifying Bits and Bytes
1 Chapter 1: Computers and Digital Basics34 Circuits and Chips An integrated circuit (computer chip) is a super-thin slice of semiconducting material packed with microscopic circuit elements
1 Chapter 1: Computers and Digital Basics35 Circuits and Chips Bits take the form of electrical pulses that can travel over circuits System board
1 SECTION D Chapter 1: Computers and Digital Basics36 Digital Processing Programs and Instruction Sets Processor Logic
1 Chapter 1: Computers and Digital Basics37 Programs and Instruction Sets Computers, portable media players, handheld computers, and smart phones all work with digital data Computer programmers create programs that control digital devices. These programs are usually written in a high-level programming language The human-readable version of a program, created in a high-level language by a programmer is called source code Examples of high-level programming languages?
1 Chapter 1: Computers and Digital Basics38 Programs and Instruction Sets
1 Chapter 1: Computers and Digital Basics39 Programs and Instruction Sets A collection of preprogrammed activities a microprocessor is hardwired to perform is called an instruction set The list of codes for a microprocessor’s instruction set, called machine language, can be directly executed by that processor’s circuitry (Note: machine language is specific/unique to a given microprocessor architecture) The end product is called machine code –1s and 0s
1 Chapter 1: Computers and Digital Basics40 Programs and Instruction Sets An op code (short for operation code) is a command word for an operation such as add, compare, or jump. The operand for an instruction specifies the data (or the address of the data) for the operation. In the following example, the op code might mean Add and the operand is 1, so the instruction means Add 1! 000000100 00000001 Op codeOperand
1 Chapter 1: Computers and Digital Basics41 Programs and Instruction Sets A simple few lines of source code in a high-level programming language often results in multiple machine language instructions.
1 Chapter 1: Computers and Digital Basics42 Processor Logic The ALU (arithmetic logic unit) is the part of the microprocessor that performs arithmetic and logical operations The ALU uses registers to hold data that is being processed The microprocessor’s control unit fetches each instruction, just as you get each ingredient out of a cupboard or the refrigerator (control/flow operations) The term instruction cycle refers to the process in which a computer executes a single instruction
1 Chapter 1: Computers and Digital Basics43 Processor Logic
1 Chapter 1: Computers and Digital Basics44 Processor Logic
1 Chapter 1: Computers and Digital Basics45 Quick Quiz 1.A(n) __________________ is a super-thin slide of semiconducting material packed with microscopic circuit elements, such as wires, transistors, capacitors, logic gates, and resistors. 2.True/False: The machine language used by digital computers is expressed as sequences of human-readable characters. 3.A prefix which refers to a million bytes of storage is ______. a.kilo- b.giga- c.mega- d.tera- Integrated Circuit (IC)
1 SECTION E Chapter 1: Computers and Digital Basics46 Password Security Authentication Protocols Password Hacks Password Security
1 Chapter 1: Computers and Digital Basics47 Authentication Protocols Security experts use the term authentication protocol to refer to any method that confirms a person’s identity using something the person knows, something the person possesses, or something the person is –A person can also be identified by biometrics, such as a fingerprint, facial features (photo), or retinal pattern –A user ID is a series of characters—letters and possibly numbers or special symbols—that becomes a person’s unique identifier –A password is a series of characters that verifies a user ID and guarantees that you are the person you claim to be
1 Chapter 1: Computers and Digital Basics48 Authentication Protocols
1 Chapter 1: Computers and Digital Basics49 Password Hacks When someone gains unauthorized access to your personal data and uses it illegally, it is called identity theft Hackers can employ a whole range of ways to steal passwords A dictionary attack helps hackers guess your password by stepping through a dictionary containing thousands of the most commonly used passwords The brute force attack also uses password-cracking software, but its range is much more extensive than the dictionary attack
1 Chapter 1: Computers and Digital Basics50 Password Hacks If hackers can’t guess a password, they can use another technique called sniffing, which intercepts information sent out over computer networks An even more sophisticated approach to password theft is phishing A keylogger is software that secretly records a user’s keystrokes and sends the information to a hacker
1 Chapter 1: Computers and Digital Basics51 Password Security
1 Chapter 1: Computers and Digital Basics52 Password Security Strive to select a unique user ID that you can use for more than one site Maintain two or three tiers of passwords
1 Chapter 1: Computers and Digital Basics53 Password Security A password manager is utility software that generates secure passwords and stores them along with user IDs and their corresponding sites
Chapter 1 Complete Computers and Digital Basics
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