| 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