Input/Output Ports

Input/Output Ports

Prep Test

  1. A parallel port transmits data

    1. One data bit at a time

    2. Four data bits at a time

    3. One sector at a time

    4. Eight data bits at a time

  2. A UART chip is used to control

    1. The Plug and Play BIOS

    2. A parallel port

    3. A serial port

    4. The processor

  3. A serial port is almost always

    1. A female port

    2. A male port

    3. A DB-15 connector

    4. A 36-pin connector

  4. An IrDA port requires which of the following conditions?

    1. Line of sight between transmitting and receiving devices

    2. Digital phone lines

    3. Clear radio frequency signals

    4. Low humidity and a clean operating environment

  5. Equipment such as the PC and the printer are designated as

    1. DCE devices

    2. DTE devices

    3. XON devices

    4. RTS devices

  6. The I/O address of COM1 is

    1. 2E8h

    2. 3E8h

    3. 2F8h

    4. 3F8h

  7. The two most common connectors used for serial ports are

    1. Centronics 25- and 36-pin

    2. DB-9 and DB-15

    3. DB-9 and DB-25

    4. Berg and Molex

  8. Which of the following are IEEE 1394 type ports? (Choose two.)

    1. FireWire

    2. USB

    3. Flaming Geyser

    4. i.Link

  9. Which of the following parallel port protocols allows bidirectional simultaneous communications?

    1. ECP

    2. SPP

    3. EPP

    4. TCP

  10. The most common form of software flow control is

    1. RTS/CTS

    2. XON/XOFF

    3. Stop bits

    4. Handshaking


  1. D. A parallel port carries an entire data character using parallel wires to carry each bit. See “Looking at Parallel Devices.”

  2. C. A UART (Universal Asynchronous Receive/Transmit) chip controls the functions and protocol of a serial port. Review “Is that UART?

  3. B. Serial ports are usually a male connector, whereas parallel ports are female connectors. Check out “Understanding Serial Devices.”

  4. A. Infrared (IR) devices require a clear, unobstructed line-of-sight between them. Take a look at “Working with Infrared Ports.”

  5. B. If the device could have been a terminal on a mainframe, it’s Data Terminal Equipment (DTE). If it’s used for communications purposes, like a modem, it’s Data Communications Equipment (DCE). Link up with “DTE to DCE, over.”

  6. D. If you’re having trouble remembering the I/O addresses for the IRQs and COM ports, just remember that COM1 comes first and gets the highest address (3F8). Study “Setting up a serial port.”

  7. C. These two connectors are common on the PC, especially for serial ports. See “Understanding Serial Devices.”

  8. A, D. FireWire (Apple) and i.Link (Texas Instruments) are proprietary versions of the IEEE 1394 standard interface. See “There’s fire in the wire: IEEE 1394.”

  9. A. SPP and EPP are parallel port standards that allow for one- and two-way communications, but both allow communications only one way at a time. TCP is either the stuff in the gasoline or the Internet protocol. Review “Keeping up to standard.”

  10. B. RTS/CTS is a hardware flow control method. Handshaking and flow control are synonymous terms, and stop bits are a part of the serial data transmission protocol. Check out “Setting up a serial port.”

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