Epson LT - 286e - Manual (Page 112)

Setting the Slide Switches
The slide switches let you do the following for your LT-286e:
Select a CPU clock speed of 12 MHz or 8 MHz
Select an external CRT
Select an external diskette drive.
The slide switches are located on the bottom of the computer.
Follow these steps:
1. Turn the computer off.
2. Disconnect all cables from the computer, including the AC
adapter.
3. Turn the computer upside down with the back panel closest
to you.
Set the slide switches only when the computer is turned off.
C L O C K
CRT/LCD
FDD
EXT/INT
DIP Switches and Slide Switches A-11