Brother Original Fonts:- Page 57

2001/10/02 

CHAPTER 2 "PCL" - 37 

You can buy cartridge/card -based bitmap fonts and scalable typefaces. Plug the cartridge/card into one of the 
printer’s cartridge/card slots and then select any font from them as if it were in the printer’s ROM.  Depending on 
your model,  you can also save bitmap fonts and scalable typeface in the flash ROM memory, installed optional 
storage device and you can use any of these as if they were a font card.