Epson EPL-6100 Reference Manual page 124

4. Identify the slot into which the ROM module is to be installed.
The ROM module is installed into the A slot (black).
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22 Installing and Removing Options
Warning:
Avoid touching the electrical components that are exposed
after you remove the side cover. Be aware that these
components may become hot while the printer is in use.
Caution:
Before you install the module, be sure to discharge any static
electricity by touching a grounded piece of metal. Otherwise,
you may damage static-sensitive components.