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The IBM Series/l 4979 Display Station (Figure 1-1) is a
table top unit that serves as a communication link between
the user and the system. It provides image display 9f data
transmitted to and from the processor. The display station
enables the user to enter, modify, or delete data on the
display, and to cause the revised display to be returned
to the processor for storage or additional processing.
Manual operations (such as displaying and altering
data, and loading programs), are performed by keying
characters from the keyboard into the display video screen.
The screen is used to display all actions. There are no
indicator lights to be decoded, because all information is
displayed on the screen in clear text. A console printer,
the 4974 is available as an optional feature to record
messages as hard copy.
This chapter is an introduction to the basic components
and features of the IBM 4979 Display Station.
The display station connects to the attachment card (a
prerequisite for the 4979) which is located in one of the
following rack mounted units:
• IBM Series/1 Model 54955 Processor
• IBM Series/1 Model 3 4953 Processor
• IBM Series/l 4959 Input/Output Expansion Unit
4953/4955/4959
Chapter 1. Introduction
Display Station FUl)ctional Description
The IBM 4979 Display Station:
• Consists of a 12-inch video monitor attached to the
processor (through the device attachment card).
• Contains an alpha-numeric keyboard.
• Is a table mounted unit.
• Displays numeric characters, upper case alphabetic
characters, and special symbols.
• Is equipped with manual intensity adjustment.
• Is used for displaying and selecting operating modes
and operator entries.
Attachment Feature Functional Description
The attachment feature card:
• Serves as the connection between the processor and the
display station.
• Interprets and executes commands from the processor.
• Provides a path for data between the processor and the
display station.
• Transfers data in parallel by byte.
• Furnishes status information to the processor and
reports condition codes after I/O instructions and
during an interrupt.
• Provides a buffer for storing data.
4979 Display
Figure 1-1. IBM Series/l 4979 Display Station and attachment
Introduction
1-1
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