Agilent Technologies 8566B Operating And Programming Manual page 148

The BL command subtracts the display line from trace B and sends the difference to trace B.
The functions of the BL and BML commands, and the front panel m key are identical. (Refer to Chapter 7 in
Section I.)
The following program demonstrates the BL command.
10 0UTPUT718;"P;A4;S2;"
20 OIJ'I??UT718;"DL-85DM;"
30 OUTPUT718;"Bl;TS;BL;"
4 0
E N D
B - display line ---t B
B-Display Line +B
P r o g r a m m i n g 3 9