IBM InfoWindow II 3153, Руководство пользователя

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Introduction
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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 combination of page and screen lengths influence 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, then blank lines will be
present below the data line or status/label line. If the page length is larger
than the allowable number of data lines, this will cause some of the rows to
be out of view. In order to bring them into view, “scrolling” or “panning” is
used, as necessary.
Scrolling causes a new line to scroll into view when the cursor advances
past the last row or first row on the page. If the cursor moves past the last
row, the top row of text is lost, and past the first row, the bottom row of text
is lost (if Auto Scroll is “on” in Setup). Text scrolled off of the screen is not
recoverable.