Magpye try this, its taken from a shorrock programing guide.
Enter the prog mode
<> option 8 ent
<> cycle through keycodes
^ select keycode type
<> options OFF, 19 master, 20 normal, 21 all on, 22 area 1, 23 area 2,
24 area 1 on, 25 area 2 on,
^ selects option
Hope this helps, I have never been into the prog side of a 1600 so this is as
clear as mud to me.