MGMT 1040 Chapter 13: MGMT 1040 Chapter 13 Notes
8 May 2018
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MGMT 1040 Chapter 13 Notes – Summary
Introduction
Characteristics of typical I/O devices
• In the computer, several different techniques are combined to resolve the problem of
synchronizing and handling I/O between varieties of different I/O devices operating with
different quantities of data at different speeds.
• We first consider the I/O requirements of some commonly used devices.
• This discussion, which appears leads to a set of requirements that the I/O-CPU interface
should meet to optimize system performance.
• Next, we briefly review programmed I/O, the method used in the Little Man Computer,
and consider its limitations.
• The important issue of interrupts, the method used to communicate events that need
special attention to the CPU.
• Interrupts are the primary means for the user to interact with the computer
• As well as the means used for communication between the CPU and the various I/O
devices connected to the system.
• We look at Direct Memory Access, or DMA, a more efficient alternative technique used
to perform I/O in the computer.
• DMA provides the ability to utilize the CPU more fully while I/O operations are taking
place.
• Finally, considers the I/O modules that provide the capability both to control the I/O
devices and to interact with the CPU and memory.
• Before discussing the techniques that are used in the real computer for performing I/O.
• It will help to consider some characteristics of the devices that will typically be
connected to the computer.
• We are not interested in the inner workings neither of these devices nor with the
interconnection of the various computer components and I/O devices that make up the
whole computer system
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