IBM 3164 ASCII Manual page 51

Chapter 3. Keys and messages
The following figure illustrates the effect of window right on the current (
cursor address (CCA). When you window right between the window
Up/Down keys
positions A and C, the CCA remains unchanged within the page. However,
when windowing continues past these three positions (to D in the example),
the display station automatically moves the CCA to a new position (in the
same row) so that the cursor remains within the viewport.
Wi ndow-A CCA
[JZJ
Window-S
~
,-
Window-D
III!
B 0000 mOB ggoo 008
3-26
B¢
(Press and hold)
Moves data in a long page up or down
When the page is longer than the viewport, these keys enable you to move the
page data up or down one row at a time, relative to the viewport. During
window-up, the cursor moves down with the page untii it is at the bottom
row of the viewport. Windowing of the page may continue, but the current
cursor position is moved up the page so that the screen cursor stays in the
viewport. Similarly, during windowing down, the cursor position can be
moved down the page. If the page has the same dimension as the
window/viewport, the Up and Down keys have no effect.
When the window is placed at the top of the page, pressing the Up key
causes an error, and the audible alarm sounds. Similarly, pressing the Down
key causes an error at the bottom of the page.
The following figure illustrates the effect of window down on the current
cursor address. When you window down between window positions A and
C, the CCA remains unchanged within the page, and the cursor itself moves
(