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Basic hardware concept

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Computer Hardware Basic

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Basic hardware concept

  1. 1. Chapter 5 5 Computing Components
  2. 2. Basic Concepts of Computer Hardware • The need to compute
  3. 3. Basic Concepts of Computer Hardware • The need to order information
  4. 4. Basic Concepts of Computer Hardware • The ability to store information
  5. 5. Basic Concepts of Computer Hardware • . . . And interface with humanity
  6. 6. Basic Concepts of Computer Hardware • Analog Computers . . . .
  7. 7. Basic Concepts of Computer Hardware • Digital Computers . . .
  8. 8. Basic Concepts of Computer Hardware • Super Computers . . .
  9. 9. 9 Computer Components Consider the following ad: Insatavialion 640 Laptop Exceptional Performance and Portability • Intel® Core™ 2 Duo (2.66GHz/1066Mhz FSB/6MB cache) • 15.6” High Definition (1080p) LED Backlit LCD Display (1366 x 768) • 512MB ATI Mobility Radeon Graphics • Built-in 2.0MP Web Camera • 4GB Shared Dual Channel DDR2 at 800MHz • 500GB SATA Hard Drive at 5400RPM • 8X Slot Load DL DVD+/- RW Drive • 802.11 a/g/n and Bluetooth 3.0 • 85 WHr Lithium Ion Battery • (2) USB 2.0, HDMI, 15-pin VGA, Ethernet 10/100/1000, IEEE 1394 Firewire, Express Card, Audio line-in, line-out, mic-in • 14.8W X 1.2H X 10.1D, 5.6 lbs • Microsoft0® Windows 7® Professional • Microsoft® Office Home and Student 2007 • 36-Month subscription to McAfee Security Center Anti-virus
  10. 10. 10 Computer Components What does all this jargon mean? • Intel® Core™ 2 Duo (2.66GHz/1066Mhz FSB/6MB cache) •4GB Shared Dual Channel DDR2 at 800 MHz •500 GB SATA Hard Drive at 5400RPM •15.6” High Definition (1080p) LED Backlit LCD Display (1366 x 768) •8X Slot Load DL DVD+/- RW Drive •14.8”W X 1.2”H X10.1” D, 5.6 lbs. Be patient! If you don't know now, you should know shortly
  11. 11. Computer Components, cont… • 512 MB ATI Mobility Radeon Graphics • 85 WHr Lithium Ion Battery • (2) USB 2.0, HDMI, 15-Pin VGA, Ethernet 10/100/1000 IEEE 1394 Firewire, Express Card, Audio line-in, line-out, mic-in • Microsoft® Windows 7® Professional • Microsoft® Office Home and Student 2007 • 36-Month subscription to McAfee Security Center Anti-virus 11
  12. 12. 12 Sizes in Perspective What is a hertz?
  13. 13. 13 Sizes in Perspective Intel Processor speed 2.66 GHz SDRAM size 4GB speed 800 MHz 500GB SATA at 5400 RPM Transfer rate 300MB per second Flat screen dot pitch .28mm To which do these apply? Bigger is better Faster is better Smaller is better
  14. 14. Basic Concepts of Computer Hardware • von Neumann Computer – Program & data are stored in the same memory – Single program counter – one instruction at a time  Input devices accept data aanndd pprrooggrraammss ffrroomm tthhee oouuttssiiddee wwoorrlldd OOuuttppuutt ddeevviicceess pprroovviiddee rreessuullttss ttoo tthhee uusseerr SSoommee ddeevviicceess aarree bbootthh iinnppuutt aanndd oouuttppuutt
  15. 15. Basic Concepts of Computer Hardware • Input devices – Keyboard – Mouse – Touch pad – Touch screen – Light pen – Microphone – Scanner – Digital camera
  16. 16. Basic Concepts of Computer Hardware • Output devices – Display Monitor – Hard drive – Speakers – Optical Disk – Printers
  17. 17. Basic Concepts of Computer Hardware • Dual Mode (input & output) – Touch screen display – Hard drive – Optical Disk – Network card – Modem – Zip / Jazz drive
  18. 18. 18 Stored-Program Concept Figure 5.1 The von Neumann architecture
  19. 19. Memory Memory A collection of cells, each with a unique physical address; both addresses and contents are in binary
  20. 20. 20 Arithmetic/Logic Unit Performs basic arithmetic operations such as adding Performs logical operations such as AND, OR, and NOT Most modern ALUs have a small amount of special storage units called registers
  21. 21. 21 Input/Output Units Input Unit A device through which data and programs from the outside world are entered into the computer; Can you name three? Output unit A device through which results stored in the computer memory are made available to the outside world Can you name two?
  22. 22. Connecting Devices • Direct interface to motherboard – Usually a “card” (NIC, Modem, Special Function) – Usually require special software (driver) • Connect via a “port” – Port is a pathway for data to go in & out of the computer from external devices – External devices are usually referred to as a “peripheral” – Different types of ports have different characteristics
  23. 23. Connecting Devices • Some of the ports: – Parallel – Serial – Video – USB – RJ-11 – RJ-45
  24. 24. Connecting Devices • Properties of ports – Serial vs Parallel – Daisy chain devices (USB or SCSI) – Speed (10M / 100M / 1G) – Buffer requirements / capacity
  25. 25. 25 Control Unit Control unit The organizing force in the computer Instruction register (IR) Contains the instruction that is being executed Program counter (PC) Contains the address of the next instruction to be executed Central Processing Unit (CPU) ALU and the control unit called the, or CPU
  26. 26. 26 Flow of Information Bus A set of wires that connect all major sections Figure 5.2 Data flow through a von Neumann architecture
  27. 27. 27 The Fetch-Execute Cycle Fetch the next instruction Decode the instruction Get data if needed Execute the instruction Why is it called a cycle?
  28. 28. 28 The Fetch-Execute Cycle Figure 5.3 The Fetch-Execute Cycle
  29. 29. The Central Processing Unit • Multiple components within the CPU • ALU : does arithmetic and logic • Control : manages all components • Registers : used to manipulate data • Instruction Decode : figures out what the instruction does • Program Counter : keeps track of next instruction • Accumulator : special register for arithmetic • Buses : interconnect components
  30. 30. Moving information within the computer • Data bus – used to move data between components • Address Bus – used to specify memory location • Control Bus – used to synchronize / regulate components • Data is moved around in bytes • Data moves either serially or in parallel – Serial data is sent one bit at a time ins sequence – Parallel data is sent eight or more bits at a time • Maximum size depends on width of the bus • Pentium has a 32bit data bus • The type of component determines the need for serial or parallel – Keyboard & mouse are serial – Hard drive, CDrom, & Printer are parallel – Everything in CPU is parallel
  31. 31. The CPU Cycle Fetch Decode Execute Interrupt RAM Instruction Register Registers
  32. 32. The CPU Cycle • Fetch instructions from memory • Decode instructions and fetch operands • Execute the decoded instruction • Service device interrupts • Repeat cycle • Cycle runs at the approximate clock speed of the CPU (more or less)
  33. 33. Storing Data & Information • Three different types of storage: – Primary memory (RAM) – Secondary storage (Hard drive) – Tertiary storage (removable material ie CD) • All storage has characteristics (properties) – Size – Speed – Access method – Volatility
  34. 34. Storing Data & Information • Primary Storage usually called RAM – Random access memory – Electronic (no moving parts) – Fastest type of storage • Access time in the nanosecond range – Direct access (can go directly to any location) – Volatile form of storage – Most expensive of the three types – Special types of memory • ROM (read only memory) • Cache (high speed memory) • PROM (programmable read only memory)
  35. 35. Storing Data & Information • Secondary Storage usually hard drive – Supports direct access at block / file level – Electronic & mechanical ( moving parts) – Slower than RAM due to mechanical aspects • Access time in the millisecond range – Nonvolatile form of storage – Much less expensive than RAM – Usually significantly larger than RAM
  36. 36. Storing Data & Information • Tertiary Storage usually removable – More often than not it is sequential – Electronic & mechanical ( moving parts) – Slower than hard drive due to mechanical aspects and removable media – Nonvolatile form of storage – Cheapest form of storage – Used for archival storage, not frequently referenced, or extremely large data sets • Good for backup purposes
  37. 37. Storing Data & Information • Capacity – 1 byte = 8 bits – 1K = 1024 bytes – 1M = 1024 K = 1,048,576 bytes – 1G = 1024 M = 1,073,741,824 bytes – 1T = 1024 G = 1,099,511,627,776 bytes • Speed – Millisecond = one thousandth of a second – Microsecond = one millionth of a second; one thousandth of a millisecond – Nanosecond = one billionth of a second; one thousandth of a microsecond
  38. 38. Storing Data & Information • Information Retrieval – Random Access (direct) – allows immediate access to stored data • RAM / ROM (each location is directly accessible) – Sequential Access – requires accessing everything from the beginning of the file up to the item you want • VHS video tape – Pseudo-direct access – can jump to designated starting points • Audio CD – can directly access starting point of each song, but must search within the song sequentially • Type of retrieval and frequency of use will determine how the data should be stored
  39. 39. Storing Data & Information • Characteristics of different types of storage • RAM – Access time: access times ranging from 80ns to 50ns – Size: PCs today can range from 256M to 1G – Cost: depends on density 256M ~ $110 / 1G ~ $375 • Hard drive – Access time: depends on speed – 7200rpm -- 8.9ms – Size: 160 G – Cost: $110 • Removable Storage (Zip / Jazz) [250 M Zip] – Access time: depends on interface – 40ms seek / 1.4Mbps xfer – Size: Unlimited – Cost: $130 + cost of media (8 pack - $85)
  40. 40. 40 RAM and ROM Random Access Memory (RAM) Memory in which each location can be accessed and changed Read Only Memory (ROM) Memory in which each location can be accessed but not changed RAM is volatile, ROM is not What does volatile mean?
  41. 41. Magnetic Tape The first truly mass auxiliary storage device was the magnetic tape drive Tape drives have a major problem; can you describe it? Figure 5.4 A magnetic tape
  42. 42. Magnetic Disks Figure 5.5 The organization of a magnetic disk
  43. 43. 43 Magnetic Disks History Floppy disks (Why "floppy"?) 1970. 8" in diameter " late 1970, 5 1/2" now, 3 1/2" Zip drives Tracks near center are more densely packed Why?
  44. 44. 44 Magnetic Disks Seek time Time it takes for read/write head to be over right track Latency Time it takes for sector to be in position Access time Can you define it?
  45. 45. 45 Compact Disks CD A compact disk that uses a laser to read information stored optically on a plastic disk; data is evenly distributed around track CD-ROM read-only memory CD-DA digital audio CD-WORM write once, read many RW or RAM both read from and written to DVD Digital Versatile Disk, used for storing audio and video
  46. 46. 46 Flash Drives Flash Memory Nonvolatile Can be erased and rewritten
  47. 47. 47 Touch Screens Touch screen A computer monitor that can respond to the user touching the screen with a stylus or finger There are three types – Resistive – Capacitive – Infrared – Surface acoustic wave (SAW)
  48. 48. 48 Synchronous processing One approach to parallelism is to have multiple processors apply the same program to multiple data sets Figure 5.8 Processors in a synchronous computing environment
  49. 49. 49 Pipelining Arranges processors in tandem, where each processor contributes one part to an overall computation Figure 5.9 Processors in a pipeline
  50. 50. 50 Shared Memory Parallel Processor Communicate through shared memory Figure 5.10 Shared memory configuration of processors
  51. 51. 51 Embedded Systems Embedded systems Computers that are dedicated to perform a narrow range of functions as part of a larger system Empty your pockets or backpacks. How many embedded systems do you have?

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