Pathway/iTS TCP and Terminal Programming Guide

Compaq NonStop™ Pathway/iTS TCP and Terminal Programming Guide—426751-001
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Programming for Specific Terminals
Compaq NonStop™ Pathway/iTS currently supports IBM 3270 terminals, the 6530
family of terminals (652x series, 653x series, and 654x series), any device that is
recognized by the file system as a conversational-mode terminal, and any entity that is
identified as an intelligent-mode device. Each type of device has its unique set of
requirements. This section summarizes those requirements.
Using IBM 3270 Terminals
When communicating with IBM 3270 terminals in the Pathway environment, there are
several important things to consider:
•
The screen size of the terminal models
•
The rules for controlling the screen mode
•
The rules for positioning the screen fields
•
The rules for positioning the cursor
•
The use of the terminal’s function keys
•
The use of extended field attributes
Screen Size
The supported IBM 3270 terminals have a number of different physical screen sizes.
Table 3-1 lists the various terminal subclasses with their maximum screen sizes (lines by
columns), alternate screen sizes, and model names.
Table 3-1. IBM 3270 Terminal Subclasses and Screen Sizes
Subclass Screen Size Model
1 12 x 40 IBM 3277 M1
2 24 x 80 IBM 3277 M2
3 24 x 80, alternate 32 x 80 IBM 3278 M3
4 24 x 80, alternate 43 x 80 IBM 3278 M4
5 12 x 40, alternate 12 x 80 IBM 3278 M1
6 24 x 80, alternate 27 x
132
IBM 3278 M5