Epson Endeavor - Manual (Page 52)

Setting the Jumpers
If you need to change any jumper settings, follow these steps:
1. Refer to the illustration below to locate the jumpers.
2. If there are any option cards installed in your computer, you
need to remove them to access the jumpers. See page 2-20.
3. If the option card connector board is in your way, you can
remove it. See page 2-21 for instructions.
Installing and Removing Options 2-9