Pathway/iTS TCP and Terminal Programming Guide

Programming for Specific Terminals
Compaq NonStop™ Pathway/iTS TCP and Terminal Programming Guide—426751-001
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Using IBM 3270 Function Keys
Using IBM 3270 Function Keys
The IBM terminals have a unique set of function keys that can be used by a SCREEN
COBOL application. The function keys are:
•
PA1 through PA3
•
PA4 through PA10
•
PF1 through PF24
The PA4 though PA10 keys are optional keys, and the values they transmit when
pressed may vary from vendor to vendor. Assigning a unique function-key value to one
of those keys’ logical PA program name can be done with the user-replaceable
procedures in the TCP user library. See Section 4, Writing User Conversion Procedures
,
for more details.
Using Extended Field Attributes
Pathway/iTS supports extended field attributes on terminals in the IBM 3270 family.
Depending on the terminal, Pathway/iTS supports the following kinds of extended field
attributes:
•
Color display attributes
•
Highlight display attributes (REVERSE, BLINK, and UNDERSCORE)
•
Outline display attributes
•
Audible alarm feature
Because of differences in terminals in the IBM 3270 family, you should consider the
following when you use extended field attributes:
•
Some terminals do not support any color display attributes.
•
Some terminals that support color display attributes support seven colors, while
others support only four.
•
Some terminals support highlight display attributes only.
•
Some terminals support outline display attributes only.
•
Some terminals support both highlight and outline display attributes.
•
Some terminals support neither highlight nor outline display attributes.
When specifying the extended field attributes in a SCREEN COBOL program unit,
consider:
•
In the SPECIAL-NAMES paragraph, define mnemonic names to identify the system
names (or combinations of system names) that correspond to one or more of the
color, highlight, or outline display attributes.