IBM 3270 Operator's Manual page 71

Because the position of the cursor determines where the next character you key
is entered, it is important to know how to move the cursor to any location on
the screen. Also, you will want to be able to move the cursor around quickly to
correct any errors you detect while working.
These keys are divided into two types:
1. Those that move the cursor to the first character location in an input field.
2. Those that move the cursor one or two character positions at a time.
Moving the Cursor to the Beginning of a Field
New Line Key. The New Line key moves the cursor to the first input character
location of the next line in which you can type. This new cursor location de-
pends on the existing data displayed and on the screen format.
When the New Line key is pressed, there are five possible new cursor locations
where you may begin entering data:
1. If the screen is unformatted, the cursor is moved to the first position in the
next line.
2. If the screen is formatted, the cursor moves to one of three locations as
described in the following examples (the New Line key is pressed when the
cursor is located at A in Figure 3-20; then, the cursor moves to location B):
a. A character position within the next line, as shown in the top example in
Figure 3-20. In this case, the cursor is placed in the first input character
location past the protected field called "ITEM DESCRIPTION:".
b. The first character position in the next line, as shown in the middle
example of Figure 3-20. In this case, no protected field or character
is present at the first character position in the next line; therefore, the
cursor is positioned at the left margin in the next line.
c. A character position on the first new line available. It may happen that
the first new line contains all protected fields. Therefore, the cursor
must keep searching until a new line is found that contains an input
field.
3. If all character positions on the screen are protected, the cursor is reposi-
tioned to the first location on line 1.
The New Line key is typamatic and moves the cursor quickly from line to line.
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