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Chapter 4 p. 6 power supply ports drive bays processor memory sound card video card modem card network card WWW.PALINFONET.COM.

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Presentation on theme: "Chapter 4 p. 6 power supply ports drive bays processor memory sound card video card modem card network card WWW.PALINFONET.COM."— Presentation transcript:

1 Chapter 4 p. 6 power supply ports drive bays processor memory sound card video card modem card network card

2 The System Unit What is the system unit? p Fig. 4-1 Next  Case that contains electronic components of the computer used to process data  Sometimes called the chassis system unit

3 The System Unit What are common components inside the system unit? p 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

4 The System Unit What is the motherboard? p 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

5 The System Unit What is a chip? p 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  Integrated circuits contain many microscopic pathways capable of carrying electrical current  Chips are packaged so they can be attached to a circuit board

6 Processor Control Unit Arithmetic Logic Unit (ALU) Central Processing Unit What is the central processing unit (CPU)? p Fig. 4-5 Next Input Devices Storage Devices Output Devices  Interprets and carries out basic instructions that operate a computer Memory DataInformation Information Data Information Control Unit  Control unit directs and coordinates operations in computer  Arithmetic logic unit (ALU) performs arithmetic, comparison, and logical operations  Also called the processor

7 Processor Control Unit Memory ALU Central Processing Unit What is a machine cycle? p 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

8 Stores location from where instruction was fetched Central Processing Unit Stores instruction while it is being decoded What is a register? p Next Stores data while ALU computes it Stores results of calculation  Temporary high-speed storage area that holds data and instructions [Data registers, Instruction registers, Instruction Address registers,Address registers, etc]

9 Central Processing Unit What is the system clock ? [Not the real-time clock!] p Next Each tick is a clock cycle Pace of system clock is clock speed Most clock speeds are in the gigahertz (GHz) range (1 GHz = one billion ticks of system clock per second) (Some run at 3.8 GHz) Processor speed can also be measured in millions of instructions per second (MIPS)  Controls timing of all computer operations  Generates regular electronic pulses, or ticks, that set operating pace of components of system unit

10 Microprocessors: Which one ? Which processor should you select? p. 191 Fig. 4-7 Next  The faster the processor, the more expensive the computer Celeron Itanium or Xeon Pentium family 1.3 GHz and up 3.0 GHz and up 2.4 GHz to 3.0 GHz Up to 2.4 GHz 2.2 GHz and up Intel ProcessorDesired Clock Speed

11 Central Processing Unit What is a zero-insertion force (ZIF) socket? p Fig 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

12 Central Processing Unit What are heat sinks and heat pipes? p Fig Next  Heat sink—component with fins that cools processor heat sink fan heat sink  Heat pipe e —smaller device for notebook computers

13 Processor What are heat sinks, heat pipes, and liquid cooling? p. 193 Fig. 4-9 Next  Heat sink—component with fins that cools processor  Heat pipe e —smaller device for notebook computers  Liquid cooling—uses a continuous flow of fluids to transfer heat away

14 Central Processing Unit What is parallel processing? p Fig Next Control Processor Processor 1 Memory Processor 2 Memory 3 Processor 3 Memory 4 Processor 4 Memory Results combined  Using multiple processors simultaneously to execute a program faster  Requires special software to divide problem and bring results together

15 Data Representation How do computers represent data? p Fig 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

16 Binary Data Representation What is a byte? p Fig Next  Eight bits (0’s 1’s) grouped together as a unit  Conversion Template for converting binary numbers to decimal numbers = 105 (decimal) Just cross out numbers with 0 underneath, and add the remaining numbers.

17 Data Representation What is a byte? p Fig 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

18 Data Representation What are three popular coding systems to represent data? p 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 (16 bits per character; 65,536 symbols) ASCIISymbolEBCDIC

19 Data Representation How is a letter converted to binary form and back? p Fig 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 ( ) 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.

20 Memory What is memory? p Fig 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 DCF2Seat DCF3

21 Memory How is memory measured? p Fig Next TermAbbreviationApproximate Size KilobyteKB or K1 thousand bytes MegabyteMB1 million bytes GigabyteGB1 billion bytes TerabyteTB1 trillion bytes  By the number of bytes available for storage

22 Memory What is flash memory? (USB flash drives) p. 199 Fig 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 (250 nanosecond speed; slower than RAM)  Used with PDAs, digital cameras, digital cellular phones, music players, digital voice recorders, printers, Internet receivers, and pagers

23 Memory & Storage Terms KILOBYTE (KB) 2**10 = 1024 BYTES ( thousand bytes) 10**3 MEGABYTE (MB) 2**20 = 1,048,576 BYTES (million bytes) 10**6 GIGABYTE (GB) 2**30 = 1,073,741,824 BYTES (billion bytes) 10**9 TERABYTE (TB) 2**40 = 1024 x 1,073,741,824 (trillion bytes) 10**12 PETABYTE (PB) 2**50 = million x billion bytes 10**15 p Fig Next

24 Memory What is random access memory (RAM)? p Next The more RAM a computer has, the faster it responds Also called main memory or primary storage Most RAM is volatile, it is lost when computer’s power is turned off Memory chips that can be read from and written to by processor

25 Faster variations of DRAM are SDRAM and RDRAM Used for special applications such as cache Most type Most common type Faster and more reliable than DRAM chips Memory What are two basic types of RAM chips? p Next Static RAM (SRAM) Dynamic RAM (DRAM)

26 Memory Where does memory reside? p Fig Next  Resides on small circuit board called memory module  Memory slots on motherboard hold memory modules  9 chips: parity check  8 chips: no parity check memory chipmemory slot dual inline memory module

27 Memory Types What is cache? [ “cache” means storage] p Fig 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

28 How much RAM do you need? What OS are you running ? What applications do you run? Computer animation and graphics? Win 2000/XP – 512MB min. Win 95/98 – 128 MB min. Linux – 128 MB Mac OS X – 256 MB min. Windows Vista - 1GB ( 2 GB would be much better !)

29 Memory: ROM (Read Only Memory) What is read-only memory (ROM)? p Next Memory chips that store permanent data and instructions Nonvolatile memory, it is not lost when computer’s power is turned off : Three types : Firmware — Manufactured withpermanently writtendata, instructions,or information EEPROM ( e lectrically e rasable p rogrammable r ead- o nly m emory)— Type of PROM containing microcode programmer can erase PROM (programmable read-only memory)— Blank ROM chip onto which a programmer can write permanently

30 The BIOS (Basic Input/Output System)  When you turn on your computer, the BIOS does:  Checks the CMOS for custom settings  Loads interrupt handlers and device drivers  Initializes CPU registers  Performs the POST (Power On Self Test)  Displays system settings  Determines which devices (disks) are bootable  Initiates the bootstrap loader sequence of instructions to load the operating system (Windows XP, for example)

31 Expansion Slots and Expansion Cards What are PC cards and flash memory cards? p 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  Hot plugging allows you to insert and remove cards while computer is running

32 Ports What are ports and connectors? p 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

33 Ports What are different types of connectors? p Fig Next

34 Serial Ports What is a serial port? p Fig Next  Transmits one bit of data at a time  Connects slow-speed devices, such as mouse, keyboard, modem

35 Parallel Ports What is a parallel port? p Fig Next  Connects devices that can transfer more than one bit at a time, such as a printer

36 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 USB Ports What are USB ports? p Next USB (universal serial bus) port can connect up to 127 different peripherals together with a single connector type

37 Special Purpose Ports What are special-purpose ports? p Fig Next  FireWire port  MIDI (Musical Instrument Digital Interface) port  SCSI (small computer system interface) port  IrDA (Infrared Data Association) port  Bluetooth TM port  Allow users to attach specialized peripherals (digital video cameras, color printers, scanners, and disk drives) or transmit data to wireless devices

38 Buses (Speeds: 400 MHz to 1066 MHz) What is a bus? p Fig 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

39 Expansion Buses What is an expansion bus? p Fig Next  Allows processor to communicate with peripherals

40 PC Card Bus Expansion Buses What is an expansion bus? p. 212 Next  Allows processor to communicate with peripherals FireWire Bus PCI Bus AGP Bus USB Bus

41 Firewire (IEEE 1394)Ports and Connectors What are FireWire ports? p. 209 Next  Connects multiple types of devices that require faster data transmission speeds  Allows you to connect up to 63 devices together

42 External & Internal Bays What is a bay? p Fig Next  Open area inside system unit used to install additional equipment  Drive bays typically hold disk drives

43 Mobile Computers What is a mobile computer? p Fig 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

44 Mobile Computers What is in the system unit of a mobile computer? p Fig Next  Motherboard, processor, and memory—also devices such as the keyboard, speakers, and display

45 Mobile Computers What ports are on a tablet PC? p Fig Next


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