1 / 74

Chapter 5

Chapter 5 Supporting I/O Devices You Will Learn… How to install peripheral I/O devices How to use ports and expansion slots for add-on devices About keyboards and how to troubleshoot them About different types of pointing devices

lotus
Download Presentation

Chapter 5

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chapter 5 Supporting I/O Devices

  2. You Will Learn… • How to install peripheral I/O devices • How to use ports and expansion slots for add-on devices • About keyboards and how to troubleshoot them • About different types of pointing devices • How monitors and video cards relate to the system, and how to troubleshoot them

  3. Basic Principles of Peripheral Installations • Peripheral is a hardware device controlled by software; must install both hardware and software • Software might be of different types; you must install all levels • More than one peripheral device might attempt to use same computer resources (IRQ, DMA channel, I/O addresses, or [for 16-bit drivers] upper memory addresses)

  4. A Review of System Resources • An IRQ is a line on a bus that serves as an interrupt request line and is assigned to a device • Each device needs a group of I/O addresses the CPU will use to get the attention of the device and communicate with it • Older device drivers and BIOS written in real mode require some upper memory addresses 640K-1024K • Some devices require a DMA channel to speed up data transfer across the bus continued…

  5. A Review of System Resources • System resources are assigned at startup • PnP devices do not request specific I/O addresses, DMA channels, or IRQs, but use those assigned by BIOS and OS • Legacy devices are not PnP and require special memory resources • Sometimes a bus controller is assigned a single set of resources for all devices using the bus

  6. Installation Overview for an Add-on Device • Install device (internal or external) • Install device driver • Install application software

  7. Internal Devices • Drives (eg, hard, floppy, CD-ROM, DVD, Zip) • Devices that are inserted in expansion slots on the motherboard • Advantages • Less expensive than external devices • Don’t take up desk space

  8. External Devices • Use existing port (eg, serial, parallel, USB, IEEE 1394) • Use port provided by interface card installed in expansion slot • Advantage • Can be moved easily from one computer to another

  9. Purchasing a Hardware Device • Have basic knowledge of your system • CPU, system bus, and local bus drive • Memory • Hard drive size • OS and version • Space available on hard drive • For internal devices: how many drives, bays, or expansion slots are available

  10. Purchasing a Hardware Device • Plug and Play? • Offers features you want? • Documentation easy to read and comprehensive? • Manufacturer’s Web site offer help and technical support? • Warranty? • Compatible with current hardware and software?

  11. Installing a Hardware Device • Use antistatic bracelet and ground mat • Unplug the PC and remove case cover • Locate the slot and remove faceplate • Insert expansion card in expansion slot • Insert screw that connects card to case • Replace case cover, power cord, and peripherals • Plug in the device • Reboot the PC; install device drivers • Test device

  12. The Case Cover

  13. Screws Connect Card to the Case

  14. Using Ports and Expansion Slots for Add-on Devices • Serial ports • Parallel ports • USB ports • IEEE 1394 ports • Expansion slots

  15. Serial, Parallel, and Game Ports

  16. Using Serial Ports • Transmit data in single bits • Almost always male • Intended for input and output devices • Configurable for COM1, COM2, COM3, or COM4 • Port assignments are made in CMOS setup • Conforms to standard interface called RS-232c • Data Terminal Equipment (DTE) and Data Communications Equipment (DCE) designations

  17. Default Port Assignments

  18. CMOS Setup Screen

  19. Pins on a Serial Port Connection continued…

  20. Pins on a Serial Port Connection

  21. Null Modem Connection • Special cable (null modem cable or modem eliminator) enables data transmission between two DTE devices without the need for modems

  22. Pin Connections for a 25-Pin Null Modem Cable

  23. Infrared Transceivers • Use resources of a serial port for communication • Create a virtual infrared serial port and virtual infrared port for infrared devices • Sometimes motherboard provides 5-pin connection for its own proprietary IrDA-compliant infrared transceiver • Industry is moving away from infrared and toward other wireless technologies because of line-of-sight issue

  24. The Universal Asynchronous Receiver-Transmitter (UART) Chip • Controls all nine pins of a serial port • Establishes communications protocol • Converts parallel data bits coming from the system bus into serial bits for transmission • Converts incoming serial data bits it receives into parallel form needed by the system bus • UART 16550 driver is built into all Windows operating systems

  25. Using Parallel Ports • Transmit data in parallel, eight bits at a time • Almost always female • Originally intended for printers; now also used for input devices • Cable should be no longer than 10 feet to avoid loss of integrity of data • Can be configured as LPT1, LPT2, or LPT3 • Port assignments are made in CMOS setup

  26. Uses of the Pin Connections for a 25-Pin Parallel Port continued…

  27. Uses of the Pin Connections for a 25-Pin Parallel Port

  28. Types of Parallel Ports • Standard parallel port (SPP) • Allows data to flow in only one direction • Slowest of the three types • Enhanced Parallel Port (EPP) • Bi-directional • Extended Capabilities Port (ECP) • Bi-directional

  29. A Standard Parallel Port

  30. Using USB Ports • Designed to make installation of slow peripheral devices as effortless as possible • Much faster than regular serial ports • Use higher-quality cabling with four wires—two for power and two for communication • Easier to manage; eliminate need to manually resolve resource conflicts continued…

  31. Using USB Ports • Allow for hot-swapping and are hot-pluggable • Most current motherboards have one to four USB ports • Managed by a USB host controller • As many as 127 USB devices can be daisy changed together using USB devices

  32. USB Ports

  33. USB Ports

  34. USB Ports

  35. Installing a USB Device • Requirements • Motherboard or expansion card that provides a USB port • OS that supports USB • USB device • USB device driver • Use Device Manager to verify that USB host controller is installed

  36. Using IEEE 1394 Ports • Provides either a 4-pin or 6-pin connector • Uses only one set of system resources • Uses isochronous data transfer • Is hot-pluggable

  37. IEEE 1394 Ports

  38. IEEE 1394 Ports

  39. Using PCI Expansion Slots • PCI bus runs in sync with CPU • PCI controller manages system resources for all PCI cards • Use Device Manager to determine which IRQ has been assigned to a PCI device • PCI bus IRQ steering can help solve problem of not having enough IRQs to support all devices

  40. PCI Expansion Slots

  41. MCA and EISA Buses • Microchannel Architecture (MCA) bus • First 32-bit bus for PCs • EISA (Extended ISA) bus • Designed to compete with MCA bus

  42. Using ISA Expansion Slots • Configuration is not automated • ISA bus does not manage system resources, as do USB and PCI bus masters • ISA device must request system resources at startup

  43. Installing Legacy Hardware • Solving problems with legacy hardware • Solving problems with legacy drivers

  44. Keyboards • Technologies in the way the keys make contact • Foil contact • Metal contact

  45. Keyboard Connectors • PS/2 connector • DIN connector • USB port • Wireless connection • Requires a driver

  46. A Keyboard Adapter

  47. Pinouts for Keyboard Connectors

  48. Troubleshooting Keyboards • A few keys don’t work • Keyboard does not work at all • Key continues to repeat after being released • Keys produce wrong characters • Major spills on keyboard

More Related