Kuhnke KDT 633, Инструкция по эксплуатации

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Display control
4.1.6. Scroll area (possible only with KDT 635)
After switching on, the write area of the screen is the so-called
scroll area. If this is left by means of cursor control commands
(line feed in the last screen line etc.) the contents of the screen
moves one line up or down. This is called "scrolling" the
screen.
The line range of the scroll area can be altered by special com-
mands, however. During normal operation, the scroll area can
only be left with absolute, but never with relative, cursor pos-
ition.
In one special case, i.e. the origin mode, the scroll area cannot
be left by any positioning command. In this case, the "upper
left screen corner" (cursor position 0,0) is in the upper left cor-
ner of the scroll area. If, in the origin mode, the scroll area is
re-defined, a home jump of the cursor may be effected so that
the cursor stays in the scroll area.
Scroll area programming
Hex 1Bh 5Bh Z1
NP
3Bh Z2
NP
72h
Decimal 27 91 Z1
NP
59 Z2
NP
114
ASCII ESC ( Z1
NP
; Z2
NP
r
This command can be used to re-define the scroll area. It then
goes from line Z1 to line Z2. The first line of the writing area
is line 0.