Lexmark X850e User Guide

If you are installing memory or option cards sometime after setting up the MFP, turn the MFP off and 
unplug the power cord before continuing.

You can customize the MFP memory capacity and connectivity by adding optional cards. The instructions in this section 
help you install any of the following options:

Memory cards
–

Printer memory

Flash memory

Firmware cards
–

Bar Code

Forms

IPDS and SCS/TNe

PRESCRIBE

PrintCryption™

Other options
–

External Serial Adapter

Tri-Port Adapter

Infrared Adapter

USB/Parallel 1284-C interface card

Coax/Twinax Adapter 

Internal print servers (also called internal network adapters or INAs)