Understanding Screen Display and Pages
This terminal offers a variety of screen lengths, including 26, 30, 44, or 52 lines. These numbers include the top and bottom status lines (or label line), as well as the
lines used to display data. A “page” of terminal memory represents the total number of lines that can be accessed, whether or not they are all viewable on the
screen at once. See Appendix A for the number and lengths of pages available for your setup.
The page length is comprised of a base page length multiplied by 1,2,4, or 8. For instance, in certain modes, 24 (24x1), 48 (24x2), and 96 (24x4) are available, the
same way that 25(25x1), 50 (25x2), and 100 (25x4) are. The base page length and the screen size determine whether a bottom status line (or label line) is displayed
or not.
Bottom Status/Label Line Display
With a screen length of “26 lines,” the page lengths that are multiples of 24 allow the bottom status/label line to appear, while those that are multiples of 25 do
not. The same idea applies with the 44-line screen size. A page length with 42 lines as a base page size leaves room for a label line, while the 43 line base page
length does not. The label line appears if the screen length is significantly larger than the page size, such as if the screen is 44 lines and the page length is 25 lines.
The figure below represents the entire page memory of a 48 line page (24 base page length times a multiplier of 2) and the portion of the page that is viewable on
the display screen, when “26 Lines” is selected. Notice that the label line is visible in this mode.
Visual Effects of Screen and Page Lengths
The interaction of page and screen lengths influences the number of displayable data lines. For example, if the page length is 50 (25 x 2), and the screen length is
44 lines, the number of data lines that are visible at any one time is 43, with no label line (the other line is used for the top status line). On a 52-line screen, 50 of
the 52 data lines are visible at one time in single session mode.
If the page length is shorter than the screen length, blank lines are present below the data line or status/label line. If the page length is larger than the allowable
number of data lines, some of the rows are out of view. In order to bring them into view, scroll or pan up or down as necessary.
Note:
An important difference exists between scrolling and panning. When you scroll (with
↑
or
↓
), you cannot return to the text that scrolls off the screen. When you
pan (with
Ctrl+
↑
and
Ctrl+
↓
), you can return to text that has disappeared from view.
Scrolling or panning causes a new line to come into view when the cursor advances past the last or first row on the page. If the cursor moves beyond the last row,
the top row of text disappears. If the cursor moves above the first row, the bottom row of text disappears (if you enabled Auto Scroll in Setup).
If the current page or portion of the page is longer than the screen display or window in which it is displayed, use
Ctrl+
↑
and
Ctrl+
↓
to pan the window up or
down.
The figure below represents the display screen with a 48-line page length on a 44-line screen, after panning the window down 2 lines.
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