Epson Equity IIe User Manual page 153

A jumper is a small electrical connector that controls one of the
computer's functions. A jumper's setting is determined by where
the jumper is placed: either between pin A and the middle pin
(position A) or between pin B and the middle pin (position B),
as shown below.
The jumpers you may need to change are on the hard disk drive
interface card (the HI card) and the main system board. The
following tables list the jumper settings and their functions.
Hard disk drive interface curd jumper settings
Jumper number Jumper setting
4
4
5
5
* Factory setting
position A
Function
A* Built-in hard disk controller
input/output port is primary
B Built-in hard disk controller
input/output port is secondary
A*
Enables the built-in hard disk
controller
B Disables the built-in hard disk
controller
position B
Options
Installing
5-13