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Chapter 4 The Components of the System Unit
Chapter 4 Objectives Differentiate among various styles of system units Identify chips, adapter cards, and other components of a motherboard Describe the components of a processor and how they complete a machine cycle Identify characteristics of various personal computer processors on the market today Define a bit and describe how a series of bits represents data Explain how programs transfer in and out of memory Differentiate among the various types of memory Describe the types of expansion slots and adapter cards Explain the difference among a serial port, a parallel port, a USB port, and other ports Describe how buses contribute to a computer’s processing speed Identify components in mobile computers and mobile devices Next
The System Unit What is the system unit? p. 4.04 Fig. 4-1 Next  Case that contains electronic components of the computer used to process data  Sometimes called the chassis system unit system unit system unit system unit
The System Unit What are common components inside the system unit? p. 4.03 Fig. 4-2 Next  Processor  Memory  Adapter cards  Sound card  Modem card  Video card  Network card  Ports  Drive bays  Power supply power supply ports drive bays processor memory sound card video card modem card network card
The System Unit What is the motherboard? p. 4.04 Fig. 4-3 Next  Main circuit board in system unit  Contains adapter cards, processor chips, and memory chips  Also called system board processor chip adapter cards memory chips memory slots motherboard Expansion slots for adapter cards
The System Unit What is a chip? p. 4.04 Fig. 4-4 Next dual inline packages (DIP) holds memory chips pin grid array (PGA) package holds processor chips  Small piece of semi-conducting material on which integrated circuits are etched Click to view animation  Integrated circuits contain many microscopic pathways capable of carrying electrical current  Chips are packaged so they can be attached to a circuit board
Processor Processor Control Control Unit Unit Arithmetic Arithmetic Logic Unit (ALU) Logic Unit (ALU) Arithmetic Arithmetic Logic Unit (ALU) Logic Unit (ALU) Central Processing Unit What is the central processing unit (CPU)? p. 4.05 Fig. 4-5 Next Input Input Devices Devices Storage Storage Devices Devices Output Output Devices Devices  Interprets and carries out basic instructions that operate a computer Memory Memory Data Data Information Information Informatio Informatio n n Data Data Informatio Informatio n n Informatio Informatio n n Data Data Informatio Informatio n n Control Control Unit Unit  Control unit directs and coordinates operations in computer  Arithmetic logic unit (ALU) performs arithmetic, comparison, and logical operations  Also called the processor
Processor Control Unit Memory ALU Central Processing Unit What is a machine cycle? p. 4.06 Fig. 4-6 Next Step 1. Fetch Obtain program instruction or data item from memory Step 2. Decode Translate instruction into commands Step 4. Store Write result to memory Step 3. Execute Carry out command  Four operations of the CPU comprise a machine cycle
Central Processing Unit What is pipelining? p. 4.07 Fig. 4-7 Next  CPU begins fetching second instruction before completing machine cycle for first instruction  Results in faster processing
Stores location Stores location from where instruction from where instruction was fetched was fetched Central Processing Unit Stores Stores instruction while it is instruction while it is being decoded being decoded What is a register? p. 4.07 Next Stores data Stores data while ALU while ALU computes it computes it Stores results Stores results of calculation of calculation  Temporary high-speed storage area that holds data and instructions
Central Processing Unit What is the system clock? p. 4.07 Click to view Web Link, then click Clock Speed below Chapter 4 Next Each tick Each tick is a is a clock cycle clock cycle Pace of system Pace of system clock is clock is clock speed clock speed Most clock speeds are Most clock speeds are in gigahertz (GHz) in gigahertz (GHz) range (1 GHz = one range (1 GHz = one billion ticks of system billion ticks of system clock per second) clock per second) Processor speed can Processor speed can also be measured in also be measured in m millions of illions of i instructions nstructions p per er s second econd (MIPS) (MIPS)  Controls timing of all computer operations  Generates regular electronic pulses, or ticks, that set operating pace of components of system unit
Central Processing Unit How do personal computer processors compare? p. 4.08 Next Comparison of Widely Used Personal Computer Processors Name Date Clock Introduced Speed Itanium 2 2002 1 GHZ and up Xeon 2001 1.4–2.4 GHZ Itanium 2001 733–800 MHZ Pentium 4 2000 1.4–2.53 GHZ Pentium III Xeon 1999 500–900 MHZ Pentium III 1999 400 MHZ–1.2 GHZ Celeron 1998 266 MHZ–1.8 GHZ Operon 2003 To come Athlon MP 2002 1.53–1.6 GHZ Athlon XP 2001 1.33–1.73 GHZ Athlon 1999 500 MHZ–1.4 GHZ ® ™ ® ® ® ™ ® ® ™ ™ ™ ™ Click to view video
Central Processing Unit Which processor should you select? p. 4.10 Next  The faster the processor, the more expensive the computer Celeron® Itanium® or Xeon ® Pentium® family 1 GHz and up 2.5 GHz and up 1.7 GHz to 2.5 GHz Up to 1.7 GHz 1.2 GHz and up Intel Processor Desired Clock Speed Click to view video
Chip-for chip upgrade Chip-for chip upgrade replace the chip replace the chip Central Processing Unit What are the types of processor upgrades? p. 4.10 Next Piggyback upgrade Piggyback upgrade stack new chip on top of old one stack new chip on top of old one Daughterboard upgrade Daughterboard upgrade chip is on adapter card that plugs into motherboard chip is on adapter card that plugs into motherboard
Central Processing Unit What is a zero-insertion force (ZIF) socket? p. 4.11 Fig. 4-10 Next Step 2. Insert the chip. Step 1. Lift the lever on the socket. lever Step 3. Push the lever down. lever  Allows you to install and remove chips with no force
Central Processing Unit What are heat sinks and heat pipes? p. 4.12 Fig. 4-11 Next  Heat sink—component with fins that cools processor heat sink fan heat sink  Heat pipee—smaller device for notebook computers
Central Processing Unit What is a coprocessor? p. 4.12 Next Chip that assists processor in performing specific tasks One type is a floating-point coprocessor floating-point coprocessor, also known as a math or numeric coprocessor
Central Processing Unit What is parallel processing? p. 4.12 Fig. 4-12 Next Control Processor Control Processor Processor 1 Processor 1 Memory Memory Processor 2 Processor 2 Memory Memory Processor 3 Processor 3 Memory Memory Processor 4 Processor 4 Memory Memory Results combined  Using multiple processors simultaneously to execute a program faster  Requires special software to divide problem and bring results together
Data Representation How do computers represent data? p. 4.13 Fig. 4-13 Next  Recognize only two discrete states: on or off  Use a binary system to recognize two states  Use Number system with two unique digits: 0 and 1, called bits (short for binary digits)  Most computers are digital
Data Representation What is a byte? p. 4.13 Fig. 4-14 Next  Eight bits grouped together as a unit  Provides enough different combinations of 0s and 1s to represent 256 individual characters  Numbers  Uppercase and lowercase letters  Punctuation marks
Data Representation What are three popular coding systems to represent data? p. 4.14 Next  ASCII—American Standard Code for Information Interchange  EBCDIC—Extended Binary Coded Decimal Interchange Code  Unicode—coding scheme capable of representing all world’s languages ASCII Symbol EBCDIC 00110000 0 11110000 00110001 1 11110001 00110010 2 11110010 00110011 3 11110011
Data Representation How is a letter converted to binary form and back? p. 4.15 Fig. 4-16 Next Step 1. The user presses the capital letter D (shift+D key) on the keyboard. Step 2. An electronic signal for the capital letter D is sent to the system unit. Step 3. The signal for the capital letter D is converted to its ASCII binary code (01000100) and is stored in memory for processing. Step 4. After processing, the binary code for the capital letter D is converted to an image, and displayed on the output device.
Memory What is memory? p. 4.15 Fig. 4-17 Next  Electronic components that store instructions, data, and results  Consists of one or more chips on motherboard or other circuit board  Each byte stored in unique location called an address, similar to addresses on a passenger train Seat #2B4 Seat #2B3
Memory How is memory measured? p. 4.16 Fig. 4-18 Next Term Abbreviation Approximate Size Kilobyte KB or K 1 thousand bytes Megabyte MB 1 million bytes Gigabyte GB 1 billion bytes Terabyte TB 1 trillion bytes  By number of bytes available for storage
Memory What is random access memory (RAM)? p. 4.17 Next The more RAM a The more RAM a computer has, the computer has, the faster it responds faster it responds Also called Also called main memory main memory or or primary primary storage storage Most RAM is Most RAM is volatile volatile, it is lost , it is lost when computer’s when computer’s power is power is turned off turned off Memory chips that can be Memory chips that can be read from and written read from and written to by processor to by processor Click to view Web Link, then click RAM below Chapter 4
Memory How do program instructions transfer in and out of RAM? p. 4.17 Fig. 4-19 Next Step 1. When you start the computer, certain operating system files load into RAM from the hard disk. The operating system displays the user interface on the screen. Operating system Operating system instructions instructions Web browser Web browser instructions instructions Word processing Word processing program program instructions instructions Operating system Operating system interface interface Web browser Web browser window window Word processing Word processing program window program window RAM RAM Web browser Web browser program instructions program instructions are removed from are removed from RAM RAM Web browser Web browser window no longer window no longer is displayed on is displayed on desktop desktop Step 2. When you start a Web browser, the program’s instructions load into RAM from the hard disk. The Web browser window is displayed on the screen. Step 3. When you start a word processing program, the program’s instructions load into RAM from the hard disk. The word processing program, along with the Web Browser and certain operating system instructions are in RAM. The word processing program window is displayed on the screen. Step 4. When you quit a program, such as the Web browser, its program instructions are removed from RAM. The Web browser no longer is displayed on the screen.
Faster Faster variations variations of DRAM are of DRAM are SDRAM SDRAM and and RDRAM RDRAM Used for Used for special special applications applications such as such as cache cache Most Most common common type type Faster and Faster and more reliable more reliable than DRAM than DRAM chips chips Memory What are two basic types of RAM chips? p. 4.18 Next Static Static RAM RAM (SRAM) (SRAM) Dynamic Dynamic RAM RAM (DRAM) (DRAM)
Memory Where does memory reside? p. 4.18 Fig. 4-20 Next  Resides on small circuit board called memory module  Memory slots on motherboard hold memory modules memory chip memory slot dual inline memory module
Memory p. 4.19 Fig. 4-21 Next How much RAM does an application require?  Software package typically indicates RAM requirements  For optimal performance, you need more than minimum specifications System Requirements Windows® XP Home Edition/Professional • Intel Pentium processor at 233MHZ or higher • AMD K6 (Athlon Duron Family processor at 233MHZ or higher • 64 MB of RAM
Memory How much RAM do you need? p. 4.19 Fig. 4-22 Next  Depends on type of applications you intend to run on your computer RAM Use 128 to 256 MB 256 to 1 GB 1 GB and up • Home and business users managing personal finance • Using standard application software such as word processing • Using educational or entertainment CD-ROMs • Communicating with others on the Web • Users requiring more advanced multimedia capabilities • Running number-intensive accounting, financial, or spreadsheet programs • Using voice recognition • Working with videos, music, and digital imaging • Creating Web sites • Participating in video conferences • Playing Internet games • Power users creating professional Web sites • Running sophisticated CAD, 3D design, or other graphics-intensive software
Memory What is cache? p. 4.20 Fig. 4-23 Next  L1 cache built into processor  L2 cache slower but has larger capacity  L2 advanced transfer cache is faster, built directly on processor chip  L3 cache is separate from processor chip on motherboard (L3 is only on computers that use L2 advanced transfer cache)  Helps speed computer processes by storing frequently used instructions and data  Also called memory cache Click to view Web Link, then click Cache below Chapter 4
Memory What is read-only memory (ROM)? p. 4.20 Next Memory chips that store Memory chips that store permanent data permanent data and instructions and instructions Nonvolatile memory Nonvolatile memory, it is not , it is not lost when computer’s lost when computer’s power is turned off power is turned off Three types: Three types: Firmware Firmware— — Manufactured with Manufactured with permanently written permanently written data, instructions, data, instructions, or information or information EEPROM EEPROM ( (e electrically lectrically e erasable rasable p programmable rogrammable r read- ead-o only nly m memory)— emory)— Type of PROM Type of PROM containing microcode containing microcode programmer programmer can erase can erase PROM PROM ( (p programmable rogrammable r read- ead-o only nly m memory)— emory)— Blank ROM Blank ROM chip onto which chip onto which a programmer a programmer can write permanently can write permanently
Memory What is flash memory? p. 4.21 Fig. 4-24 Next Step 1. Purchase and download MP3 music tracks from a Web site. With one end of a special cable connected to the system unit, connect the other end into the MP3 player. Step 2. Instruct the computer to copy the MP3 music track to the flash memory chip in the MP3 player. Step 3. Plug the headphones into the MP3 player, push a button on the MP3 player, and listen to the music through the headphones. MP3 Player Flash memory chip Flash memory card From computer To headphones  Nonvolatile memory that can be erased electronically and reprogrammed  Used with PDAs, digital cameras, digital cellular phones, music players, digital voice recorders, and pagers Click to view Web Link, then click Flash Memory below Chapter 4
Memory What is CMOS? p. 4.22 Next Uses battery power to retain information when other power is turned off Stores date, time, and computer’s startup information Complementary metal-oxide semiconductor memory Used in some RAM chips, flash memory chips, and other types of memory chips
Memory What is access time? p. 4.22 Fig. 4-26 Next  Amount of time it takes processor to read data from memory  Measured in nanoseconds (ns), one billionth of a second  It takes 1/10 of a second to blink your eye; a computer can perform up to 10 million operations in same amount of time Term Speed Millisecond One-thousandth of a second Microsecond One-millionth of a second Nanosecond One-billionth of a second Picosecond One-trillionth of a second
Expansion Slots and Expansion Cards What is an adapter card? p. 4.23 Fig. 4-27 Next Types of Adapter Cards  Enhances system unit or provides connections to external devices called peripherals  Also called an expansion card Click to view Web Link, then click Adapter Cards below Chapter 4
Expansion Slots and Expansion Cards What is an expansion slot? p. 4.23 Fig. 4-28 Next  An opening, or socket, on the motherboard that can hold an adapter card  With Plug and Play, the computer automatically configures cards and other devices as you install them
Expansion Slots and Expansion Cards What are PC cards and flash memory cards? p. 4.24 Fig. 4-29–4-30 Next  A PC card adds memory, sound, modem, and other capabilities to notebook computers  A flash memory card allows users to transfer data from mobile devices to desktop computers Click to view Web Link, then click PC Cards below Chapter 4  Hot plugging allows you to insert and remove cards while computer is running
Ports What are ports and connectors? p. 4.25 Fig. 4-31–4.32 Next  Port connects external devices to system unit  Connector joins cable to peripheral  Available in one of two genders: male and female Click to view Web Link, then click Ports and Connectors below Chapter 4
Ports What are different types of connectors? p. 4.26 Fig. 4-33 Next
Ports What is a serial port? p. 4.27 Fig. 4-34 Next  Transmits one bit of data at a time  Connects slow-speed devices, such as mouse, keyboard, modem
Ports What is a parallel port? p. 4.27 Fig. 4-35 Next  Connects devices that can transfer more than one bit at a time, such as a printer
Third USB device connects to second USB device, and so on Second USB device connects to first USB device First USB device connects to USB port on computer Single USB port can be used to attach multiple peripherals in a daisy chain PCs typically have two to four USB ports on front or back of the system unit Ports What are USB ports? p. 4.28 Next USB (universal serial bus) port can connect up to 127 different peripherals together with a single connector type
Ports What are special-purpose ports? p. 4.28 Fig. 4-37 Next  FireWire port  MIDI (Musical Instrument Digital Interface) port  SCSI (small computer system interface) port  IrDA (Infrared Data Association) port  BluetoothTM port  Allow users to attach specialized peripherals (digital video cameras, color printers, scanners, and disk drives) or transmit data to wireless devices
Buses What is a bus? p. 4.30 Fig. 4-38 Next  Channel that allows devices inside computer to communicate with each other  System bus connects processor and RAM  Bus width determines number of bits transmitted at one time  Word size is the number of bits processor can interpret and execute at a given time Click to view Web Link, then click Buses below Chapter 4
Buses What is an expansion bus? p. 4.31 Fig. 4-39 Next  Allows processor to communicate with peripherals
Bays What is a bay? p. 4.32 Fig. 4-40 Next  Open area inside system unit used to install additional equipment  Drive bays typically hold disk drives
Mobile Computers What is a mobile computer? p. 4.33 Fig. 4-41 Next PDA flash memory card notebook computer PC Cards in PC Card slots disk in floppy disk drive or Zip® disk drive battery CD or DVD drive  Notebook, weighing between 2.5 and 8 pounds, or mobile device such as a PDA
Mobile Computers What is in the system unit of a mobile computer? p. 4.34 Fig. 4-42 Next  Motherboard, processor, and memory—also devices such as the keyboard, speakers, and display
Mobile Computers What ports are on a notebook computer? p. 4.34 Fig. 4-43 Next
Mobile Computers What ports are on a tablet PC? p. 4.35 Fig. 4-44 Next
Putting It All Together What are suggested processor, clock speed, and RAM requirements based on the needs of various types of users? p. 4.35 Fig. 4-45 Next
Summary of the Components of the System Unit Components of the system unit How memory stores data, instructions, and information Sequence of operations that occur when a computer executes an instruction Comparison of various personal computer processors on the market today Chapter 4 Complete

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Componts of system unit( Information Technology).ppt

  • 1.
    Chapter 4 The Componentsof the System Unit
  • 2.
    Chapter 4 Objectives Differentiateamong various styles of system units Identify chips, adapter cards, and other components of a motherboard Describe the components of a processor and how they complete a machine cycle Identify characteristics of various personal computer processors on the market today Define a bit and describe how a series of bits represents data Explain how programs transfer in and out of memory Differentiate among the various types of memory Describe the types of expansion slots and adapter cards Explain the difference among a serial port, a parallel port, a USB port, and other ports Describe how buses contribute to a computer’s processing speed Identify components in mobile computers and mobile devices Next
  • 3.
    The System Unit Whatis the system unit? p. 4.04 Fig. 4-1 Next  Case that contains electronic components of the computer used to process data  Sometimes called the chassis system unit system unit system unit system unit
  • 4.
    The System Unit Whatare common components inside the system unit? p. 4.03 Fig. 4-2 Next  Processor  Memory  Adapter cards  Sound card  Modem card  Video card  Network card  Ports  Drive bays  Power supply power supply ports drive bays processor memory sound card video card modem card network card
  • 5.
    The System Unit Whatis the motherboard? p. 4.04 Fig. 4-3 Next  Main circuit board in system unit  Contains adapter cards, processor chips, and memory chips  Also called system board processor chip adapter cards memory chips memory slots motherboard Expansion slots for adapter cards
  • 6.
    The System Unit Whatis a chip? p. 4.04 Fig. 4-4 Next dual inline packages (DIP) holds memory chips pin grid array (PGA) package holds processor chips  Small piece of semi-conducting material on which integrated circuits are etched Click to view animation  Integrated circuits contain many microscopic pathways capable of carrying electrical current  Chips are packaged so they can be attached to a circuit board
  • 7.
    Processor Processor Control Control Unit Unit Arithmetic Arithmetic Logic Unit (ALU) LogicUnit (ALU) Arithmetic Arithmetic Logic Unit (ALU) Logic Unit (ALU) Central Processing Unit What is the central processing unit (CPU)? p. 4.05 Fig. 4-5 Next Input Input Devices Devices Storage Storage Devices Devices Output Output Devices Devices  Interprets and carries out basic instructions that operate a computer Memory Memory Data Data Information Information Informatio Informatio n n Data Data Informatio Informatio n n Informatio Informatio n n Data Data Informatio Informatio n n Control Control Unit Unit  Control unit directs and coordinates operations in computer  Arithmetic logic unit (ALU) performs arithmetic, comparison, and logical operations  Also called the processor
  • 8.
    Processor Control Unit Memory ALU Central ProcessingUnit What is a machine cycle? p. 4.06 Fig. 4-6 Next Step 1. Fetch Obtain program instruction or data item from memory Step 2. Decode Translate instruction into commands Step 4. Store Write result to memory Step 3. Execute Carry out command  Four operations of the CPU comprise a machine cycle
  • 9.
    Central Processing Unit Whatis pipelining? p. 4.07 Fig. 4-7 Next  CPU begins fetching second instruction before completing machine cycle for first instruction  Results in faster processing
  • 10.
    Stores location Stores location fromwhere instruction from where instruction was fetched was fetched Central Processing Unit Stores Stores instruction while it is instruction while it is being decoded being decoded What is a register? p. 4.07 Next Stores data Stores data while ALU while ALU computes it computes it Stores results Stores results of calculation of calculation  Temporary high-speed storage area that holds data and instructions
  • 11.
    Central Processing Unit Whatis the system clock? p. 4.07 Click to view Web Link, then click Clock Speed below Chapter 4 Next Each tick Each tick is a is a clock cycle clock cycle Pace of system Pace of system clock is clock is clock speed clock speed Most clock speeds are Most clock speeds are in gigahertz (GHz) in gigahertz (GHz) range (1 GHz = one range (1 GHz = one billion ticks of system billion ticks of system clock per second) clock per second) Processor speed can Processor speed can also be measured in also be measured in m millions of illions of i instructions nstructions p per er s second econd (MIPS) (MIPS)  Controls timing of all computer operations  Generates regular electronic pulses, or ticks, that set operating pace of components of system unit
  • 12.
    Central Processing Unit Howdo personal computer processors compare? p. 4.08 Next Comparison of Widely Used Personal Computer Processors Name Date Clock Introduced Speed Itanium 2 2002 1 GHZ and up Xeon 2001 1.4–2.4 GHZ Itanium 2001 733–800 MHZ Pentium 4 2000 1.4–2.53 GHZ Pentium III Xeon 1999 500–900 MHZ Pentium III 1999 400 MHZ–1.2 GHZ Celeron 1998 266 MHZ–1.8 GHZ Operon 2003 To come Athlon MP 2002 1.53–1.6 GHZ Athlon XP 2001 1.33–1.73 GHZ Athlon 1999 500 MHZ–1.4 GHZ ® ™ ® ® ® ™ ® ® ™ ™ ™ ™ Click to view video
  • 13.
    Central Processing Unit Whichprocessor should you select? p. 4.10 Next  The faster the processor, the more expensive the computer Celeron® Itanium® or Xeon ® Pentium® family 1 GHz and up 2.5 GHz and up 1.7 GHz to 2.5 GHz Up to 1.7 GHz 1.2 GHz and up Intel Processor Desired Clock Speed Click to view video
  • 14.
    Chip-for chip upgrade Chip-forchip upgrade replace the chip replace the chip Central Processing Unit What are the types of processor upgrades? p. 4.10 Next Piggyback upgrade Piggyback upgrade stack new chip on top of old one stack new chip on top of old one Daughterboard upgrade Daughterboard upgrade chip is on adapter card that plugs into motherboard chip is on adapter card that plugs into motherboard
  • 15.
    Central Processing Unit Whatis a zero-insertion force (ZIF) socket? p. 4.11 Fig. 4-10 Next Step 2. Insert the chip. Step 1. Lift the lever on the socket. lever Step 3. Push the lever down. lever  Allows you to install and remove chips with no force
  • 16.
    Central Processing Unit Whatare heat sinks and heat pipes? p. 4.12 Fig. 4-11 Next  Heat sink—component with fins that cools processor heat sink fan heat sink  Heat pipee—smaller device for notebook computers
  • 17.
    Central Processing Unit Whatis a coprocessor? p. 4.12 Next Chip that assists processor in performing specific tasks One type is a floating-point coprocessor floating-point coprocessor, also known as a math or numeric coprocessor
  • 18.
    Central Processing Unit Whatis parallel processing? p. 4.12 Fig. 4-12 Next Control Processor Control Processor Processor 1 Processor 1 Memory Memory Processor 2 Processor 2 Memory Memory Processor 3 Processor 3 Memory Memory Processor 4 Processor 4 Memory Memory Results combined  Using multiple processors simultaneously to execute a program faster  Requires special software to divide problem and bring results together
  • 19.
    Data Representation How docomputers represent data? p. 4.13 Fig. 4-13 Next  Recognize only two discrete states: on or off  Use a binary system to recognize two states  Use Number system with two unique digits: 0 and 1, called bits (short for binary digits)  Most computers are digital
  • 20.
    Data Representation What isa byte? p. 4.13 Fig. 4-14 Next  Eight bits grouped together as a unit  Provides enough different combinations of 0s and 1s to represent 256 individual characters  Numbers  Uppercase and lowercase letters  Punctuation marks
  • 21.
    Data Representation What arethree popular coding systems to represent data? p. 4.14 Next  ASCII—American Standard Code for Information Interchange  EBCDIC—Extended Binary Coded Decimal Interchange Code  Unicode—coding scheme capable of representing all world’s languages ASCII Symbol EBCDIC 00110000 0 11110000 00110001 1 11110001 00110010 2 11110010 00110011 3 11110011
  • 22.
    Data Representation How isa letter converted to binary form and back? p. 4.15 Fig. 4-16 Next Step 1. The user presses the capital letter D (shift+D key) on the keyboard. Step 2. An electronic signal for the capital letter D is sent to the system unit. Step 3. The signal for the capital letter D is converted to its ASCII binary code (01000100) and is stored in memory for processing. Step 4. After processing, the binary code for the capital letter D is converted to an image, and displayed on the output device.
  • 23.
    Memory What is memory? p.4.15 Fig. 4-17 Next  Electronic components that store instructions, data, and results  Consists of one or more chips on motherboard or other circuit board  Each byte stored in unique location called an address, similar to addresses on a passenger train Seat #2B4 Seat #2B3
  • 24.
    Memory How is memorymeasured? p. 4.16 Fig. 4-18 Next Term Abbreviation Approximate Size Kilobyte KB or K 1 thousand bytes Megabyte MB 1 million bytes Gigabyte GB 1 billion bytes Terabyte TB 1 trillion bytes  By number of bytes available for storage
  • 25.
    Memory What is randomaccess memory (RAM)? p. 4.17 Next The more RAM a The more RAM a computer has, the computer has, the faster it responds faster it responds Also called Also called main memory main memory or or primary primary storage storage Most RAM is Most RAM is volatile volatile, it is lost , it is lost when computer’s when computer’s power is power is turned off turned off Memory chips that can be Memory chips that can be read from and written read from and written to by processor to by processor Click to view Web Link, then click RAM below Chapter 4
  • 26.
    Memory How do programinstructions transfer in and out of RAM? p. 4.17 Fig. 4-19 Next Step 1. When you start the computer, certain operating system files load into RAM from the hard disk. The operating system displays the user interface on the screen. Operating system Operating system instructions instructions Web browser Web browser instructions instructions Word processing Word processing program program instructions instructions Operating system Operating system interface interface Web browser Web browser window window Word processing Word processing program window program window RAM RAM Web browser Web browser program instructions program instructions are removed from are removed from RAM RAM Web browser Web browser window no longer window no longer is displayed on is displayed on desktop desktop Step 2. When you start a Web browser, the program’s instructions load into RAM from the hard disk. The Web browser window is displayed on the screen. Step 3. When you start a word processing program, the program’s instructions load into RAM from the hard disk. The word processing program, along with the Web Browser and certain operating system instructions are in RAM. The word processing program window is displayed on the screen. Step 4. When you quit a program, such as the Web browser, its program instructions are removed from RAM. The Web browser no longer is displayed on the screen.
  • 27.
    Faster Faster variations variations of DRAM are ofDRAM are SDRAM SDRAM and and RDRAM RDRAM Used for Used for special special applications applications such as such as cache cache Most Most common common type type Faster and Faster and more reliable more reliable than DRAM than DRAM chips chips Memory What are two basic types of RAM chips? p. 4.18 Next Static Static RAM RAM (SRAM) (SRAM) Dynamic Dynamic RAM RAM (DRAM) (DRAM)
  • 28.
    Memory Where does memoryreside? p. 4.18 Fig. 4-20 Next  Resides on small circuit board called memory module  Memory slots on motherboard hold memory modules memory chip memory slot dual inline memory module
  • 29.
    Memory p. 4.19 Fig.4-21 Next How much RAM does an application require?  Software package typically indicates RAM requirements  For optimal performance, you need more than minimum specifications System Requirements Windows® XP Home Edition/Professional • Intel Pentium processor at 233MHZ or higher • AMD K6 (Athlon Duron Family processor at 233MHZ or higher • 64 MB of RAM
  • 30.
    Memory How much RAMdo you need? p. 4.19 Fig. 4-22 Next  Depends on type of applications you intend to run on your computer RAM Use 128 to 256 MB 256 to 1 GB 1 GB and up • Home and business users managing personal finance • Using standard application software such as word processing • Using educational or entertainment CD-ROMs • Communicating with others on the Web • Users requiring more advanced multimedia capabilities • Running number-intensive accounting, financial, or spreadsheet programs • Using voice recognition • Working with videos, music, and digital imaging • Creating Web sites • Participating in video conferences • Playing Internet games • Power users creating professional Web sites • Running sophisticated CAD, 3D design, or other graphics-intensive software
  • 31.
    Memory What is cache? p.4.20 Fig. 4-23 Next  L1 cache built into processor  L2 cache slower but has larger capacity  L2 advanced transfer cache is faster, built directly on processor chip  L3 cache is separate from processor chip on motherboard (L3 is only on computers that use L2 advanced transfer cache)  Helps speed computer processes by storing frequently used instructions and data  Also called memory cache Click to view Web Link, then click Cache below Chapter 4
  • 32.
    Memory What is read-onlymemory (ROM)? p. 4.20 Next Memory chips that store Memory chips that store permanent data permanent data and instructions and instructions Nonvolatile memory Nonvolatile memory, it is not , it is not lost when computer’s lost when computer’s power is turned off power is turned off Three types: Three types: Firmware Firmware— — Manufactured with Manufactured with permanently written permanently written data, instructions, data, instructions, or information or information EEPROM EEPROM ( (e electrically lectrically e erasable rasable p programmable rogrammable r read- ead-o only nly m memory)— emory)— Type of PROM Type of PROM containing microcode containing microcode programmer programmer can erase can erase PROM PROM ( (p programmable rogrammable r read- ead-o only nly m memory)— emory)— Blank ROM Blank ROM chip onto which chip onto which a programmer a programmer can write permanently can write permanently
  • 33.
    Memory What is flashmemory? p. 4.21 Fig. 4-24 Next Step 1. Purchase and download MP3 music tracks from a Web site. With one end of a special cable connected to the system unit, connect the other end into the MP3 player. Step 2. Instruct the computer to copy the MP3 music track to the flash memory chip in the MP3 player. Step 3. Plug the headphones into the MP3 player, push a button on the MP3 player, and listen to the music through the headphones. MP3 Player Flash memory chip Flash memory card From computer To headphones  Nonvolatile memory that can be erased electronically and reprogrammed  Used with PDAs, digital cameras, digital cellular phones, music players, digital voice recorders, and pagers Click to view Web Link, then click Flash Memory below Chapter 4
  • 34.
    Memory What is CMOS? p.4.22 Next Uses battery power to retain information when other power is turned off Stores date, time, and computer’s startup information Complementary metal-oxide semiconductor memory Used in some RAM chips, flash memory chips, and other types of memory chips
  • 35.
    Memory What is accesstime? p. 4.22 Fig. 4-26 Next  Amount of time it takes processor to read data from memory  Measured in nanoseconds (ns), one billionth of a second  It takes 1/10 of a second to blink your eye; a computer can perform up to 10 million operations in same amount of time Term Speed Millisecond One-thousandth of a second Microsecond One-millionth of a second Nanosecond One-billionth of a second Picosecond One-trillionth of a second
  • 36.
    Expansion Slots andExpansion Cards What is an adapter card? p. 4.23 Fig. 4-27 Next Types of Adapter Cards  Enhances system unit or provides connections to external devices called peripherals  Also called an expansion card Click to view Web Link, then click Adapter Cards below Chapter 4
  • 37.
    Expansion Slots andExpansion Cards What is an expansion slot? p. 4.23 Fig. 4-28 Next  An opening, or socket, on the motherboard that can hold an adapter card  With Plug and Play, the computer automatically configures cards and other devices as you install them
  • 38.
    Expansion Slots andExpansion Cards What are PC cards and flash memory cards? p. 4.24 Fig. 4-29–4-30 Next  A PC card adds memory, sound, modem, and other capabilities to notebook computers  A flash memory card allows users to transfer data from mobile devices to desktop computers Click to view Web Link, then click PC Cards below Chapter 4  Hot plugging allows you to insert and remove cards while computer is running
  • 39.
    Ports What are portsand connectors? p. 4.25 Fig. 4-31–4.32 Next  Port connects external devices to system unit  Connector joins cable to peripheral  Available in one of two genders: male and female Click to view Web Link, then click Ports and Connectors below Chapter 4
  • 40.
    Ports What are differenttypes of connectors? p. 4.26 Fig. 4-33 Next
  • 41.
    Ports What is aserial port? p. 4.27 Fig. 4-34 Next  Transmits one bit of data at a time  Connects slow-speed devices, such as mouse, keyboard, modem
  • 42.
    Ports What is aparallel port? p. 4.27 Fig. 4-35 Next  Connects devices that can transfer more than one bit at a time, such as a printer
  • 43.
    Third USB device connects tosecond USB device, and so on Second USB device connects to first USB device First USB device connects to USB port on computer Single USB port can be used to attach multiple peripherals in a daisy chain PCs typically have two to four USB ports on front or back of the system unit Ports What are USB ports? p. 4.28 Next USB (universal serial bus) port can connect up to 127 different peripherals together with a single connector type
  • 44.
    Ports What are special-purposeports? p. 4.28 Fig. 4-37 Next  FireWire port  MIDI (Musical Instrument Digital Interface) port  SCSI (small computer system interface) port  IrDA (Infrared Data Association) port  BluetoothTM port  Allow users to attach specialized peripherals (digital video cameras, color printers, scanners, and disk drives) or transmit data to wireless devices
  • 45.
    Buses What is abus? p. 4.30 Fig. 4-38 Next  Channel that allows devices inside computer to communicate with each other  System bus connects processor and RAM  Bus width determines number of bits transmitted at one time  Word size is the number of bits processor can interpret and execute at a given time Click to view Web Link, then click Buses below Chapter 4
  • 46.
    Buses What is anexpansion bus? p. 4.31 Fig. 4-39 Next  Allows processor to communicate with peripherals
  • 47.
    Bays What is abay? p. 4.32 Fig. 4-40 Next  Open area inside system unit used to install additional equipment  Drive bays typically hold disk drives
  • 48.
    Mobile Computers What isa mobile computer? p. 4.33 Fig. 4-41 Next PDA flash memory card notebook computer PC Cards in PC Card slots disk in floppy disk drive or Zip® disk drive battery CD or DVD drive  Notebook, weighing between 2.5 and 8 pounds, or mobile device such as a PDA
  • 49.
    Mobile Computers What isin the system unit of a mobile computer? p. 4.34 Fig. 4-42 Next  Motherboard, processor, and memory—also devices such as the keyboard, speakers, and display
  • 50.
    Mobile Computers What portsare on a notebook computer? p. 4.34 Fig. 4-43 Next
  • 51.
    Mobile Computers What portsare on a tablet PC? p. 4.35 Fig. 4-44 Next
  • 52.
    Putting It AllTogether What are suggested processor, clock speed, and RAM requirements based on the needs of various types of users? p. 4.35 Fig. 4-45 Next
  • 53.
    Summary of theComponents of the System Unit Components of the system unit How memory stores data, instructions, and information Sequence of operations that occur when a computer executes an instruction Comparison of various personal computer processors on the market today Chapter 4 Complete