IBM 1800409-001A - Manual (Page 267)

2. Insert the card into either slot (fig. 8.10) with the front label
side facing left toward the inside of the printer.
3. Depending on the type of card you are installing, either turn
the printer on again or put it back on line.
Fig. 8.10 Insert the Font or Emulation Card
Chapter 8
P r i n t e r O p t i o n s 8 - 1 1