IBM 3174 Reference Guide

Keyboard Extension Mode
The following functions are not available when you are using a 3270 or ASCII
terminal to communicate with an IBM host:
• BREAK
• Long Break
• Control.
Some of the keyboard extension mode functions are not described in this book.
See the 3174 Functional Description for information about:
• X.21
• X.25
• RTMLTTI
• Load Matrix.
See Entry Assist User's Guide for information about:
• DOC ON OFF
• WRAP
• CHGFMT
• CRPOS.
Pseudo-ALT Keys
The Enter Pseudo-ALT key puts your keyboard into an alternate shift state and the
Pseudo-ALT indicator appears in the operator information area (OIA). This key has
the same effect as pressing and holding the ALT key. Pseudo-ALT is used when
the ALT key on your keyboard is used as the control key and/or your terminal does
not send that ALT key data and any other data from keys used while you are
holding the ALT key.
The Exit Pseudo-ALT key or pressing and releasing the ALT key takes the keyboard
out of the alternate shift state and the indicator is removed from the OIA.
Alternate Extension Mode Key Sequence
An alternate extension mode key sequence is provided. Some terminals do not
provide an extension mode key. For these terminals, the 3174 can be customized
to allow the Home or Print ID key to serve as the extension mode key. To enter
extension mode, press and release the Home or Print ID key.
If your Home key is being used to serve as the extension mode key, access to the
Home function is changed. You must press the Home key twice to return the cursor
to home. The Print ID key is affected the same way if you are using it to serve as
the extension mode key.
Note: The information above applies to all 3270 Base keyboards or other
keyboards being used to simulate 3278 or 3279 keyboards. This does not
apply to Converged Keyboards in native mode, or to Enhanced keyboards.
Chapter 1. GettingStarted 1-7

IBM 3174 Specifications

General

Brand	IBM
Model	3174
Category	Controller
Language	English