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.