sc_remove_cutmarking(scp);
break;
case 1: /* clear from beginning of display to cursor */
sc_vtb_erase(&scp->vtb, 0, scp->cursor_pos, ch, attr);
sc_vtb_erase(&scp->vtb, 0, scp->cursor_pos+1, ch, attr);
mark_for_update(scp, 0);
mark_for_update(scp, scp->cursor_pos);