HP 1100A - Manual (Page 40)

40 Chapter 3 Printing media EN
Printing cards
The HP LaserJet 1100 does not support paper smaller than 76 by
127 mm (3 by 5 in.). Verify cards are not stuck together before
loading.
1 Adjust the paper output-lever to the down position.
2 Load with the narrow side down and the side-to-be-printed
facing toward the front of the printer. Adjust the paper guides
to fit the card.
3 Select the correct card size in the software application being
used. (Software settings can override printer properties.)
4 Print.