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Chapter 4

Chapter 4. MANAGING DEVICES AND PERIPHERALS. Device Manager. Provides a graphic view of hardware installed on the computer Helps to manage and trouble shoot the hardware Shows whether hardwire is working properly. Automatic Installation of Hardware.

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Chapter 4

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  1. Chapter 4 MANAGING DEVICES AND PERIPHERALS

  2. Device Manager • Provides a graphic view of hardware installed on the computer • Helps to manage and trouble shoot the hardware • Shows whether hardwire is working properly

  3. Automatic Installation of Hardware • Plug-and-Play (PNP) has changed the way we install hardware • Manual installation of hardware is a thing of the past • All you need to install PNP hardware is • The hardware • The driver • The directions

  4. Automatic Installation of Hardware • The Plug and Play (PnP) basic input/output system (BIOS) automatically identifies PnP devices and arbitrates their resource requests. • The resource allocation among PnP devices is not permanent. • If another PnP device requests a resource that has already been allocated, the BIOS again arbitrates the requests to satisfy all of them.

  5. Automatic Installation of Hardware • After startup, Windows XP takes over management of devices and might again change one or more assignments to suit its own requirements

  6. Troubleshooting Installations • The best way to avoid problems with the installation of hardware is to follow the manufactures instructions • Although you can run into problems with their instructions.

  7. Troubleshooting Installations • If you see any of the icons indicating a hardware problem try the following • Open the Properties dialog box for the device. The General tab lists the status of the device and lets you launch a device troubleshooter.

  8. Troubleshooting Installations • Consult the manufacturer’s instructions to verify that you have performed all necessary steps to configure the device • Right-click the device and select Uninstall. Restart Windows, and allow it to detect the device again.

  9. Hardware Resources • Hardware resources are used by the hardware to communicate with the operating system • They are • Interrupts • Input/Output (I/O) ports • Direct Memory Access (DMA) channels

  10. Hardware Resources • Hardware resources are dynamically changed in the PNP process • It is important to remember not to change the resources of a PNP device because this can have and effect on the dynamic process

  11. Interrupts • Hardware devices must get the processor’s attention to send messages. • The microprocessor knows this process as an interrupt request (IRQ) • The microprocessor uses this information to determine which device needs its attention and the type of attention that it needs.

  12. Interrupts • Modern computers have minimum of 15 interrupts • Computers with Advanced Programmable Interrupt Controllers (APICs) can have up to 24 IRQs,

  13. Input/Output (I/O) Ports • I/O ports are a section of memory that a hardware device uses to communicate with the operating system. • When a microprocessor receives an interrupt request via an IRQ, the operating system checks the I/O port address to retrieve additional information about what the hardware device wants it to do.

  14. Direct Memory Access (DMA) channels • DMA channels allow a hardware device, such as a floppy disk drive, to access memory directly, without interrupting the microprocessor. • DMA channels speed up access to memory

  15. Direct Memory Access (DMA) channels • Modern computers have eight DMA channels, numbered 0 through 7 • DMA channels are managed by the motherboard’s chipset or by devices that have their own DMA controller.

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