Boundless 4000/160, Руководство пользователя

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16 Introduction
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.
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,
“scrolling” or “panning” is used as necessary.
Scrolling causes a new line to scroll into view when the cursor
advances past the last or first row on the page. If the cursor
moves past the last row, the top row of text is lost; if past the first