IBM 3164 ASCII Manual page 154

page and the scroll function is enabled, the scroll-up occurs to display the
double-height characters. If the scroll function is disabled, the command is
rejected.
As a result of windowing, the top or bottom half characters might be
displayed at the bottom or top line, respectively, in the viewport.
Before After
' - "' ' ' d ft' h liiLI..." .---.
w\'Uv'JlIg NlIlII . -
Bottom
eM;
~ gN1l11
- - . J .....--.
opqrstuVWxyz8 half of
opqrstuvwxyza - - . J double-
height
Window Down characters
,...--. 123456789012
Specify
123456789012
---.-J ....---.
ABCOfcrH· IJ
r
cel
DHSW ------
ABCDEFGHIJ ----'
f\l
Viewport Viewport
As a result of scrolling, if the top half of a double-height line is shifted out,
the remaining single-height line is replaced with a line of null characters.
Before
After
Double--'-'
'-"'''d.hULI...".----.
~
A null
height
CeM; vlV
UNItI! ~
opqrstuvwxyz8 line
line opqrstuvwxYZ8 appears
Scroll Up
~
123456789012
Specify
123456789012 - - ' ....---. ABCDEcruIJ.:::J~ eel
DHSW ----+
ABCDEFGHIJ - - - I [\lI1
Page
Page
When the bottom (or top) half of the double- height line is displayed on the
top (or bottom) row, the cursor movement to the top (or bottom) row causes
auto-windowing to occur to display all characters of the double height line.
The following figure shows an example.
Before
After
(ll\;UG'JltgNIIfIl ------,
'-"'''d.h'yt'''mn......,~
eel
opqrstuvwxYZ8 - - . ,
~
eM; vlV
Nfl
I., .....J
~
opqrstuvwxyza
123456789012 ------,
ABCOEFGHIJ
--c::
1:~~~~~~~~
A double-width line contains characters twice as wide as standard
characters. Using a double-width line means that only one-half of the line in
the window can fit on the corresponding line of the viewport; if a line is
defined as an BO-character double-width line, only the left 40 double-width
characters can be displayed on that line.
The cursor cannot move into the unused area at the right-hand side of the
double-width line in the window.
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