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System Resources

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Chapter Summary

This chapter has described standard methods used to coordinate the movement of data throughout the personal computer. It has also presented standard system resource allocations for various types of I/O devices. Technicians must be aware of these typical assignments in order to isolate resource conflicts that may develop and to install non-Plug and Play hardware devices in systems. The chapter concluded with a short explanation of binary numbers and working with hexadecimal addressing.

At this point, review the objectives listed at the beginning of the chapter to be certain that you understand each point and can perform each task listed there. Afterward, answer the review questions that follow to verify your knowledge of the information.

Key Terms


  • Binary

  • Bit

  • Byte

  • COM1

  • COM2

  • Direct Memory Access (DMA)

  • Hexadecimal (hex)


  • I/O port addresses

  • Infrared (IrDA) ports

  • Interrupt request (IRQ)

  • Interrupt-driven I/O

  • IO Channel Check (IOCHCK) signal

  • Maskable Interrupts (IRQs)

  • Non-Maskable Interrupts (NMI)

  • Parity Check (PCK)

  • Polling

  • Programmed I/O

  • Serial communications (COM) ports

  • Translation mode

  • Universal Asynchronous Receiver-Transmitter (UART)

  • Universal Serial Bus (USB)

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