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- Usage: SET SCROLL_LINES [<number of screen lines to scroll>]
- This allows you to set the number of lines the screen will
- scroll each time the cursor reaches the bottom of the screen.
- If SCROLL_LINES is set to 0, the SCROLL is turned OFF as well,
- and must be turned back on before scrolling can be resumed.
- The maximum number of lines that may be scrolled is the size of
- the display (the number of lines on the screen minus 2).
- Negative numbers are automatically changed to positive.
-