INT 0x10 - 0x06 - Scroll Window Up

Request/Call:

reg	value	descr
AH	0x06
AL	var	number of lines to scroll, previous lines are blanked if 0 or AL > screen size, window is blanked
BH	var	attribute to be used on blank line
CH	var	row of upper left corner of scroll window
CL	var	column of upper left corner of scroll window
DH	var	row of lower right corner of scroll window
DL	var	column of lower right corner of scroll window

Nothing

in video mode 4 (300×200 4 color) on the EGA, MCGA and VGA this function scrolls page 0 regardless of the current page
can be used to scroll graphics screens, using character coords
on CGA's this function disables video adapter, causing flitter
affect only the current active page