Lexmark 4I3 - Manual (Page 279)

Appendix C. Forms Information
The following chapter describes the forms specifications, quality, and
restrictions needed for use with the 4230 Printer.
Forms Specifications
The 4230 Printer operates with continuous forms and cut sheet
forms. If your printer is equipped with either the F1 or F2 form feed
device, you can use continuous forms. If your printer is equipped
with either the F3 or F4 form feed device, you can use cut sheet
forms. See the following information on the physical characteristics
of forms for each type of device.
Copyright IBM Corp. 1991, 1994 C-1