The MultiJAMMA requires a
moderate level of understanding in
hooking up power supplies and JAMMA type
game boards. Please DO NOT purchase the
kit if you are uncomfortable doing
something like wiring up power to a game
cabinet. If you do things wrong you can destroy
the MultiJAMMA and the game boards
attached to it. If in doubt, hire a local
video game electronics technician. I will
only be able to give "generic"
suggestions-- I will not help with your
particular installation. It's too easy to
misunderstand things in e-mail!
Due to the "do-it-yourself"
nature of the kit and the dangers of
hooking up the power wrong, the
MultiJAMMA is sold AS-IS with NO RETURNS
OR REFUNDS. Each kit is fully tested
before shipment. If any MultiJAMMA
component fails I will be happy to repair
or replace it, but you will be
responsible for parts and labor charges.
- Monitor Type:
The MultiJAMMA will work best with an
"auto-sync" type game monitor.
(In general this is most any monitor made
after about 1994 or so, and most any that
came in a factory-built "JAMMA
cabinet", but there are other ones
as well.) It is possible to use the
MultiJAMMA on an older manual-sync
monitor, but depending on your game
boards the display on some games could
"roll" or not sync without
manually tweaking the monitor controls
when you switch games.
To test your monitor
you can do the following:
- Collect the game
boards you would like to use with the
- One at a time,
plug in each game board and turn on
your game. Make sure the picture
looks "normal" without
having to make any adjustments on the
If the monitor did not
sync on one or more of the games, or if you
had to manually tweak the monitor to get it
to sync (I warned you not to!), the
MultiJAMMA will act the same way. (So if one
of the games "rolls" on the monitor
without the MultiJAMMA, it will do the same
through the MultiJAMMA too!)
You may be able to set
an older manual-sync monitor to a setting
that will sync for all the games through
trial and error. It will depend on the
monitor and the games however.
- Power Supply
Part 1: You will need to add an
additional power supply (or two) to your
game cabinet to supply power for the game
boards. The power supply is not included
in the price of the MultiJAMMA. The
MultiJAMMA will use the power supply in
your JAMMA cabinet for its own power, but
additional power is needed for game
boards connected to the MultiJAMMA. The
switching power supplies used in personal
computers are recommended for use with
- Power Supply
Part 2: Power requirements for
the additional power supply(s) will vary
with your games, but in general you can
use the following guideline:
- Assume 5 Amps of
+5 Volt power for every game board.
- Assume 1 Amp of
+12 Volt power for every game board.
- Some -5V current
(for some games only).
doubt, go with bigger power supplies.
Following this example, a full
8-game MultiJAMMA would require:
8 * 5 Amps = 40 Amps of
+5 Volt power
8 * 1 Amps = 8 Amps of
+12 Volt power
Some -5V supply
"PC" power supplies are rated for
about 20A of +5 Volt power, a
"safe" configuration would be two
PC power supplies-- one for every four games.
(The 5 Amp per game "rule of thumb"
already has safety margin calculated in, so
being right at the rated limit of the power
supply is OK since the rating should be
Users with electronics
experience can measure the current being
drawn by their games and select a power
supply more specifically suited for their
application if so desired.
Remember-- if in doubt,
just buy a power supply that you know is
larger than you need.
The MultiJAMMA includes the cables to
connect to the game boards. The
MultiJAMMA switchboards include
connectors that plug into PC-style
disk-drive power connectors-- those will
be adequate for most games. If your game
board is particularly power-hungry, or if
it requires -5V power (usually for Audio
output) there is a high-power 8-pin
.156" header connector that you can
cable your power supply to. You will need
to make (or buy from someone else) any
power supply cable that goes to the 8-pin
orientation: The MultiJAMMA
doesn't do any sort of screen-flipping or
rotating. Most JAMMA games have a
dip-switch setting to "flip"
the screen, but not all do. Lots of older
"classic" era games do not
allow the screen to be flipped without
flipping the monitor. Take this into
account when selecting your games. The
MultiJAMMA will not make a
"vertical" game play on a
"horizontal" monitor. (Other
than by turning your head sideways...)
Q: How do I use the
MultiJAMMA with fighting games (etc.) that have
A: The MultiJAMMA supports
the three "standard" buttons for each
player on the JAMMA connector. It also support
the fourth semi-standard button on the JAMMA
connector. To use the MultiJAMMA with fighting
games you simply connect the extra buttons on the
control panel directly to the extra buttons
inputs on each game board. The buttons do not
need to go through the MultiJAMMA at all.
Q. Will the MultiJAMMA work
with JAMMA based driving games or paddle-type or
A. Similar to the question
above, if the controllers used are non-standard
the MultiJAMMA won't know what to do with them.
On the other hand, the control signals don't have
to go through the MultiJAMMA, so as long as the
controls are compatible with the games you want
to use, you can generally hook them together in
parallel without any problems. (Gun games might
have problems if there are too many games on one
gun, you'll have to experiment.)
Q: How long have you had
this available? Is it reliable?
A: The MultiJAMMA has been
shipping since June of 2000. During that time
I've only have two systems returned for repair.
In both cases they were damaged by improper
Q: How much is it?
A: The MultiJAMMA with two
Switchboards is $125 + shipping/handling.
Additional Switchboards are priced at $22.50
System Integrator Information:
I welcome anyone
that wants to resell or build systems using the
MultiJAMMA to contact me. Due to the narrow
margins on the product there will not be
particularly deep volume price cuts, however by
pre-building power cables and including power
supplies into a complete solution for novice
users there should be ample opportunity for good
profit margins. In addition, for retail or eBay
sellers multigame machines are a great way to
improve the bottom line!