IBM 3270 User Guide

Press the DOC ON OFF key several times. It turns document
mode on or off.
When document mode is on, the characters DOC or D^ appear in the
operator information area and the Entry Assist functions are
available. D-» indicates that
enhanced null/space processing mode
is also active.
When document mode is off, Entry Assist functions are not
available and your terminal operates exactly as it did before.
Let's try setting margins and also see how word wrap works.
Do the following;
Turn on document mode. The DOC symbol (or the D-» symbol) and the
0 symbol appear in the operator information area.
This is the word wrap symbol indicating that word wrap is on.
Position this line of text at the top of the screen.
(This is to avoid a procedural problem later.)
Press the CHG FMT key. This puts the display into
change format mode, so you can observe and change line formats.
A scale line appears in the operator information area
(instead of the normal symbols), and an additional cursor
appears on the scale line. The scale line shows
the current settings of the margins, tab stops, and the
"end of line" signal position.
The symbols used on the scale line are as follows:
margins < and > symbols
tab stops _ symbol
end of line signal position * symbol
I Move the cursor so that it lines up with the first character of
this sentence.
Type the < symbol on the scale line. The previous < symbol
disappears and only the one you typed remains on the scale line.
This is the new left margin. The scale line cursor
also disappears, but reappears when you press the Cursor Move key.
Move the cursor until it lines up with the last character on this
line, and type the > symbol. This sets your right margin at that
position.
Press the CHG FMT key again. This takes you out of change format mode.
The scale line disappears, and the cursor returns to the position
it was in when you entered change format mode.
Use the margins you just set.
Hold down the New Line key. The cursor stays at the new left
margin you just set as it goes down the screen.
Chapters. Entry Assist Tutorial 5-3

IBM 3270 Specifications

General

Brand	IBM
Model	3270
Category	Desktop
Language	English