Changing A Jumper Setting; Memory Card Jumpers; Jumper Positions - Epson Equity III User Manual

The procedure for changing a jumper setting is given first, then the
jumper functions and locations for each card are described separately. All the
instructions assume you have already removed the cover from the main unit.
For instructions on removing the cover, replacing the cover, and installing
and removing option cards, see Chapter 4.

Changing a Jumper Setting

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). Figure A-2 shows both positions.
A
To move a jumper from one position to the other, use needle-nose pliers
or tweezers to lift it off the board and gently move it to the other position. Be
careful not to lose the jumper or leave it out of the computer.

Memory Card Jumpers

The jumpers on the memory card control the following functions:
Amount of RAM (main memory). If you install a memory card that
l
needs to use part of the main memory, you may need to change the
jumper settings to disable some of the main memory on the memory
card. Be sure to check your memory card instructions to see if this is
necessary.
EPROM size. You can change the EPROM size jumper if you install a
l
different size of EPROM.
Which pair of EPROMs to use. Change these jumpers if you want to use
l
the alternate pair of EPROMs (there are four EPROMs in all) for a spe-
cial application.
A-2
Position A
A
Figure A-2. Jumper positions
Position B