INT 10h,  07h (7)        Scroll Window Down

Scrolls a specified window downward a specified number of lines.

On entry:      AH         07h
AL         Number of lines to scroll (if 0, clear entire
window)
BH         Display attribute for blank lines
CH         Row number of upper left corner
CL         Column number of upper left corner
DH         Row number of lower right corner
DL         Column number of lower right corner

Returns:       None

Registers destroyed:      AX, SP, BP, SI, DI

                                                                          

Lines are inserted at the top with all lines moving down. The new
lines are filled with blank characters of a specified display
attribute (value in BH). The lines that disappear at the bottom of the
window are lost.

Notes:         If the number of lines to scroll is specified as 0,
the entire window is filled with blanks.

Use Service 06h to scroll the window up.

This service affects only the currently active
display page.

See also: INT 10h, 06h

INT 10h, 07h (7) Scroll Window Down