Epson Printer Interface Cartridge Operation Manual page 92

Several tiny switches called DIP (for Dual In-Line Package)
switches are in the back of your LX-90 printer. These switches control
a number of important printer functions. Although the factory set-
tings are the best for most uses, you may want to change some of
them.
The design of the LX-90 gives you easy access to the switches, which
you can locate using Figure D-l.
Appendix D
The DIP Switches
Figure D-1. DIP switch location
D-l