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Chapter 5 Hardware--The CPU & Storage Hardware--The CPU & Storage Using Information Technology 1 Hardware--The CPU & Storage 5.1 Microchips, Miniaturization, & Mobility 5.2 The System Unit 5.3 Secondary Storage 5.4 Future Developments in Processing & Storage Hardware--The CPU & Storage How to Buy a Multimedia Computer System 2 5.1 Microchips, Miniaturization, & Mobility From Vacuum Tubes to Transistors to Microchips Hardware--The CPU & Storage • Transistor - a tiny electrically operated switch, or gate, that can alternate between “on” and “off” many millions of times per second 1940s vacuum tube towering over 1950s transistor 3 1 Make large drawing. Reduce drawing hundreds of times to microscopic size. 2 Duplicate reduced photo many times on sheet. Hardware--The CPU & Storage Steps in Manufacture of a Microchip 4 3 Print sheet of multiple copies on a wafer made of silicon, a semiconductor. 4 Print layer after layer above and below original silicon surface. Hardware--The CPU & Storage Steps in Manufacture of a Microchip 5 5 Cut wafer into chips. 6 Mount chip in frame with connective pins extruding. Hardware--The CPU & Storage Steps in Manufacture of a Microchip 6 Miniaturization Miracles: Microchips, Microprocessors, & Micromachines • Memory • Logic • Communications • Graphics • Math • Microprocessor • Microcontroller Hardware--The CPU & Storage • Types of microchips: 7 The Binary System: Using On/Off Electrical States to Represent Data & Instructions • The binary system • Bit - binary digit • Byte - group of 8 bits used to represent one character, digit, or other value Hardware--The CPU & Storage has only two digits--0 and 1. 8 The Binary System: Using On/Off Electrical States to Represent Data & Instructions • Kilobyte 1000 bytes • Megabyte 1,000,000 bytes (one million) • Terabyte 1 trillion bytes • Petabyte 1 quadrillion bytes Hardware--The CPU & Storage • Gigabyte 1,000,000,000 bytes (one billion) 9 The Binary System: Using On/Off Electrical States to Represent Data & Instructions l EBCDIC - used with large computers l Unicode - uses two bytes for each character rather than one Hardware--The CPU & Storage l ASCII - the binary code most widely used with microcomputers 10 The Parity Bit Parity bit - an extra bit attached to the end of a byte for purposes of checking for accuracy l Odd parity sum of bits must come out odd Hardware--The CPU & Storage l Even parity sum of bits must come out even Even parity scheme 11 • Machine language - a binary-type programming language that the computer can run directly Hardware--The CPU & Storage Machine Language 12 The Computer Case: Bays, Buttons & Boards • System unit houses the motherboard, power supply, and storage devices • Case - empty box with just power supply Overhead view of system unit Hardware--The CPU & Storage • Bay - a shelf or opening used for the installation of electronic equipment 13 Power Supply UPS • Types of power protection devices: • Surge protector • Voltage regulator • UPS Surge protector Hardware--The CPU & Storage • Power supply - a device that converts AC to DC to run the computer 14 The Motherboard & the Microprocessor Chip • Expansion - increasing a computer’s capabilities by adding hardware • Upgrading - changing to newer, more powerful versions Hardware--The CPU & Storage • Motherboard - the main circuit board in the system unit 15 The Motherboard & the Microprocessor Chip 1 CISC (Complex Instruction Set Computing) Supports a large number of instructions at relatively low processing speeds 2 RISC (Reduced Instruction Set Computing) - Supports a reduced number of instructions in order to obtain faster processing speeds Hardware--The CPU & Storage • Two principal architectures or designs of microprocessors: 16 The Motherboard & the Microprocessor Chip 1 Intel-type chips made by Intel, AMD, and others 2 Motorola-type chips made by Motorola for Apple Macintosh computers Hardware--The CPU & Storage • Two kinds of microprocessors used in most personal computers today: 17 Processing Speeds: From Megahertz to Picoseconds Microcomputers X X MIPS X X FLOPS Fractions of a second Supercomputers X X X X Hardware--The CPU & Storage Megahertz & Gigahertz Workstation Mainframes s 18 Hardware--The CPU & Storage How the Processor or CPU works: Control Unit, ALU, & Registers 19 Hardware--The CPU & Storage How the Processor or CPU works: Control Unit, ALU, & Registers Machine cycle 20 How Memory Works: RAM, ROM, CMOS, & Flash • Types of memory chips: RAM - Random Access Memory, used to temporarily hold software instructions and data 2 ROM 3 CMOS 4 Flash Hardware--The CPU & Storage 1 21 How Memory Works: RAM, ROM, CMOS, & Flash 1 RAM 2 ROM - Read-Only Memory, which cannot be written on or erased by the computer user. Contains fixed start-up instructions 3 CMOS 4 Flash Hardware--The CPU & Storage • Types of memory chips: 22 How Memory Works: RAM, ROM, CMOS, & Flash 1 RAM 2 ROM 3 CMOS - Complementary metal-oxide semiconductor; powered by a battery and thus doesn’t lose its contents when the power is off 4 Flash Hardware--The CPU & Storage • Types of memory chips: 23 How Memory Works: RAM, ROM, CMOS, & Flash 1 2 3 4 RAM ROM CMOS Flash - can be erased and reprogrammed more than once Hardware--The CPU & Storage • Types of memory chips: 24 How Cache Works: Level 1 (Internal) & Level 2 (External) •Cache - temporary storage for instructions and data that the processor is likely to use frequently, thus speeding up processing •Level 2 (L2) cache - consists of RAM chips outside microprocessor •Virtual memory - free hard-disk space used to extend the capacity of RAM Hardware--The CPU & Storage •Level 1 (L1) cache - built into the microprocessor 25 Other Methods of Speeding Up Processing: Interleaving, Bursting, & Pipelining •Bursting - a process in which the CPU grabs a block of information at a time, on the assumption that the next address requested will be sequential to the previous one •Pipelining - division of large tasks into a series of smaller overlapping ones Hardware--The CPU & Storage •Interleaving - a process in which the CPU alternates communication between two or more memory banks 26 Ports & Cables 1 Serial port - sends bits one at a time, one after another 2 Parallel port 3 SCSI port 4 USB port 5 Dedicated port 6 Infrared port Hardware--The CPU & Storage • Types of ports: 27 1 Serial port 2 Parallel port transmits 8 bits simultaneously 3 SCSI port 4 USB port 5 Dedicated port 6 Infrared port Hardware--The CPU & Storage Ports & Cables 28 1 Serial port 2 Parallel port 3 SCSI port - allows data to be transmitted in a “daisy chain” to up to 7 devices 4 USB port 5 Dedicated port 6 Infrared port Hardware--The CPU & Storage Ports & Cables 29 Ports & Cables Serial port Parallel port SCSI port USB port - can theoretically connect up to 127 peripheral devices daisychained to one general-purpose port 5 Dedicated port 6 Infrared port Hardware--The CPU & Storage 1 2 3 4 30 Ports & Cables Serial port Parallel port SCSI port USB Dedicated port special-purpose ports 6 Infrared port Dedicated ports: mouse port, modem port, and keyboard port Hardware--The CPU & Storage 1 2 3 4 5 31 1 2 3 4 5 6 Serial port Parallel port SCSI port USB Dedicated port - specialpurpose ports Infrared port - allows a computer to make a cableless connection with infrared-capable devices Hardware--The CPU & Storage Ports & Cables 32 Expandability: Buses & Cards • Expansion cards circuit boards that provide more memory or that control peripheral devices Hardware--The CPU & Storage • Expansion slotssockets on the motherboard into which you can plug expansion cards 33 Expandability: Buses & Cards •PCI bus - for higher-speed uses; used to connect graphics cards, sound cards, modems, and highspeed network cards •AGP bus - for even higher speeds and 3D graphics Hardware--The CPU & Storage •ISA bus - for ordinary low-speed uses; the most widely used expansion bus 34 Expandability: Buses & Cards •Graphics cards - for monitors •Modem cards - for remote communication via phone lines •Network interface cards - for remote communication via cable Hardware--The CPU & Storage •Sound cards - for speakers and audio output •PC cards - for laptop computers 35 5.3 Secondary Storage • Floppy disk - a removable flat piece of mylar plastic packaged in a 3.5inch plastic case Hardware--The CPU & Storage Floppy Disks 36 Floppy-Disk Cartridges • Zip disks - 100 or 250 Mb • HiFD disks - 200 Mb Hardware--The CPU & Storage • SuperDisks - 120 Mb 37 • Hard disks - thin but rigid metal platters covered with a substance that allows data to be held in the form of magnetized spots Hardware--The CPU & Storage Hard Disks 38 Hard Disks Hardware--The CPU & Storage • Head crash - event that happens when the surface of the read/write head or particles on its surface come into contact with the surface of the hard-disk platter, causing the loss of some or all of the data on the disk 39 Hard Disks Hardware--The CPU & Storage • Nonremovable hard disks - housed in a microcomputer system unit and used to store nearly all programs and most data files 40 • Removable hard disks - one or two platters enclosed along with read/write heads in a hard plastic case, which is inserted into a microcomputer’s cartridge drive Bits on disk - dark stripes are 0 bits and bright stripes are 1 bits Hardware--The CPU & Storage Hard Disks 41 Hard-Disk Technology for Large Computer Systems •Removable packs - 6-20 hard disks aligned one above the other in a sealed unit •RAID storage system - two or more disk drives within a single cabinet which sends data to the computer along several parallel paths simultaneously Hardware--The CPU & Storage •Fixed-disk drive - high-speed, high-capacity disk drives that are sealed in their own cabinets 42 Optical Disks: CDs & DVDs Hardware--The CPU & Storage • Optical disk - a removable disk on which data is written and read through the use of laser beams 43 Optical Disks: CDs & DVDs • CD-R - for recording on once • CD-RW - for rewriting many times Hardware--The CPU & Storage • CD-ROM - read only. For prerecorded text, graphics, and sound 44 Optical Disks: CDs & DVDs • DVD-ROM - for reading only • For rewriting many times: • • • DVD-RW DVD-RAM DVD+RW Hardware--The CPU & Storage • DVD-R - for recording on once 45 Magnetic Tape • Tape cartridges modules resembling audio cassettes that contain tape in rectangular, plastic housings Hardware--The CPU & Storage • Magnetic tape - thin plastic tape coated with a substance that can be magnetized (for 1s) or left non-magnetized (for 0s) 46 Smart Cards • Optical card - plastic, laser-recordable, wallet-type card used with an optical-card reader Smart card in use Hardware--The CPU & Storage • Smart card - looks like a credit card but contains a microprocessor embedded in the card 47 • Flash memory card - circuitry on credit-cardsize PC card that can be inserted into slots connecting to the motherboard Hardware--The CPU & Storage Flash Memory Cards 48 Online Secondary Storage • @Backup • Personal Vault • SafeGuard Interactive Hardware--The CPU & Storage • Connected Online Backup 49 Hardware--The CPU & Storage 5.4 Future Developments in Processing & Storage 50 Future Developments in Processing • DSP chips - processors for the post-PC era • Nanotechnology • DNA computing • Quantum computing • Other possibilities - molecular and dot computers Hardware--The CPU & Storage • Optical computing 51 Future Developments in Secondary Storage • Higher-density disks • The age of “storewidth” Hardware--The CPU & Storage • Molecular electronics - storage at the subatomic level 52