I have set the formlines=66 on a LJ1100 by sending ASCII string 27 38 108 54 54 80 to printer. This changed the formlines from the default of 60 lines per page to 66. Now this same string actually prints the characters on paper so I believe that at least the ESC character is different on the LJ1200. I have not been able to locate this information on the HP website. Thanks in advance.