lNPUT/OUTPUT (I/O) AND INTERFACING
The input/output section, under the control of the CPUs control section, allows
the computer to communicate with and/or control other computers, peripheral
devices, other subsystems (display and communication), and systems (fire control,
sonar, FTAS, and the like). Take the time to understand your computers I/O
section: its organization, operation, and interfacing format. The latter is very
important because if the interfaces for the computer and the external equipment do
not match, your computer will not talk to anyone.
After completing this chapter you should be able to:
Understand the terminology associated with I/O
Describe how your computers input/output is organizedhardware
List and describe how the different operating modes affect the transfer
Describe the circuits and their functions in I/O operations
Describe the categories of I/O operations
Recognize how the external equipment in your computers system is
List and describe the types of interfaces used in I/O operations
Describe serial data I/O operations
Describe parallel data I/O operations
Lets begin your study of input/output with how it is organized in your
computer. The different types of computers vary in their organization of I/O, but
the basic operations of the serial and parallel interfaces are similar regardless of
the computer types.
l ANSI American National Standards Institute.
You should be familiar with the following terms
l Data Communications Equipment (DCE) Any
before studying this chapter:
device that communicates the data; for example, a
. ANEW Army-Navy Electronic Warfare.