Compatibility: All
Expects: AH    07H
AL    number of lines to scroll in (0=blank entire rectangle)
BH    video attribute to be used on blank line(s)
CH,CL row,clm of lower-right corner of rectangle to scroll/blank
DH,DL row,clm of upper-left corner of rectangle to scroll/blank
                                                                  
Returns: (none)
                                                                  
Info: You may use this to scroll screen text down; that is, move each
line of text lower on the screen and add one or more blank lines
at the top.

This fn can be used to scroll a rectangular subset of the screen.
It may also be used to clear the entire screen or any rectangular
subset.

See INT 10H 06H (scroll up / cls) for notes and related info.

See Also: INT 10H 06H (scroll up / cls)
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INT 10H 07H: Scroll Down / Clear Screen Rectangle