Epson LT - 286e - Manual (Page 121)

An option card must meet certain power supply requirements.
The option card cannot draw more than the specified current
(Amps):
Supply voltage Maximum current
+5 Volts 0.8 Amps
12 Volts 0.1 Amps
-5 Volts 0.05 Amps
-12 Volts 0.05 Amps
The option card must not interfere with options installed in the
internal ports. For example, if you install an option card with a
parallel port, you must assign that port as the secondary parallel
port ($278) if the internal parallel port is the primary parallel
port ($378). If you want the parallel port on the option card to
be the primary parallel port, you must disable the internal
parallel port by setting DIP switch SW2-9 to OFF. See “Setting
the DIP Switches” in Appendix A for details.
WARNING
You cannot install an optional video card in the expansion
slot; video cards interfere with the built-in video capabilities
of the LT-286e. You cannot install an option card that
supports a diskette drive, a hard disk drive, or an expansion
box that supports multiple cards.
B-8 Installing Options