IBM 3174 Reference Guide

Using 3174 Editing Features
About the IBM 3174 Establishment Controller
The IBM 3174 Establishment Controller Is one of the components of the IBM 3270
Information Display System. In this book, the IBM 3174 Establishment Controller Is
referred to as the 3174.
The 3174 connects terminals, printers, and personal computers to host processors.
The 3174 allows you to use either an ASCII or a 3270 type of terminal to connect to
IBM or ASCII hosts.
This book provides Information about:
• Using 3270 terminals to communicate with ASCII hosts
• Using an ASCII terminal to communicate with IBM or ASCII hosts.
For Information about using 3270 terminals with IBM hosts, see the Entry Assist
User's Guide and the 3174 Functional Description.
This chapter contains Information about new editing functions and how you can
establish multiple host connections.
Using 3174 Editing Features
Type Ahead
Two new 3174 editing functions have been added In this release. You may find
them helpful when you enter data. These functions are available when you are
communicating with an IBM host.
Type Ahead Is a function that allows you to continue typing, even while the host
computer Is busy processing your keystrokes. Before this release, If:
X SYSTEM X SYSTEM x =-= O X 0-0 ()
X X 0 X X0-0 () ()
appeared on the status line of your terminal, you could not have continued typing.
Now, with Type Ahead, you can still use your keyboard. If you see X ?+ on your
status line when you attempt to type while one of the symbols shown above Is
displayed, the Type Ahead function may be disabled. Ifthis happens, see your
system administrator for assistance. See the 3174 Functional Description for more
Information about Type Ahead.
Enhanced Null/Space Processing
When you are communicating with an IBM host, you can turn Enhanced Null/Space
Processing on and off by using the Extension key or Extended Select and then the
null/space processing key. See Figure 1-2 on page 1-8 through Figure 1-4 on
page 1-9 for the location of these keys. Normally, blanks that appear on your
screen because you use the cursor movement keys disappear when you press
Enter. Blanks that appear on your screen when you use the space bar remain
when you press Enter. For example. Ifyou typed the following three-column entry
without using the space bar between columns,
GET INDCB.BUF A NEW RECORD
1-2 3174 Establishment Controller Terminal User's Reference for Expanded Functions

IBM 3174 Specifications

General

Brand	IBM
Model	3174
Category	Controller
Language	English