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HALL EFFECT JOYSTICK CONTROLLER
PROJECT BLOG
BUY
PARTS
NOW
(Updated: 03-29-08)
There's been a lot of interest in
the progression of various projects over here at RAM Controls, so the
following page has been created to provide background information on the
original hall effect controller (used in I Robot, Roadrunner and Escape
from the Planet of the Robot Monsters) as well as interesting photographs and
supporting text on the actual creation of the reproduction controller.
I'm going to focus mostly on the use of this joystick with I, Robot as I
had the most experience with this game, compared to the others.

Background
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It all started in the year
1982. I was 13 years old at the time and my dad was the owner of a medium sized
R&D company who did design work for various arcade game
manufacturers. My dad being in the field he was in afforded me
certain privileges that other kids my age didn't have. This
particular perk included the chance to see a prototype I, Robot at the Atari labs before it was released to the general
public. I was allowed to "test" the game ...and boy
did I savor my time with this machine! I immediately made note
of the 3D-like graphics as something I had never seen prior.
Game play wasn't so great, but I was really drawn to the look of the
game. The prototype didn't look like the full production model
you see to the left, BTW. It looked much like a Crystal
Castles cabinet, but dressed in all black, which was released around
the same time as I, Robot. Many
months
later, I saw a production model (as pictured
to the left) at the local arcade and another one at the Golf n'
Stuff....and a third at Camelot (another miniature golf
place). The first thing I noticed at all three places?
No line to play the game. In fact, NOBODY playing the
game! Obviously, this game was a goner unless something
changed....and fast! Sadly, nobody seemed to like the game
(come to find out it was "ahead of it's time") and it was
pulled from the floor at every arcade within a few weeks. |
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Fast
forward to the year 1988. I quickly worked my way up the
ladder and became the head tech at a local arcade repair shop.
I had a knack for repairing the "impossible" boards,
specifically multi-board setups using nothing more than a logic
probe, signal injector and multi-meter. By this time, I had
seen tons of I, Robots pass through the shop. These were one
of the few games that made it into collectors hands at an early
point in their life. Because it was such a poor earner, all
the operators were eager to get rid of them. I'm sure they
took a big loss offloading them back in the 80's, but space was a
premium for a lot of shoe-string budget ops. Typically, a low
earner would get converted to some other game, but I only saw a
small handful of I, Robots get converted to something else. It
was most likely because of the odd shape of the cabinet or the hall
effect joystick that the game used. Anyhow,
the #1 problem with the games that came into the shop? You
guessed it!! Yep, it was the joystick. In an attempt to
make a better product with no physical link between the joystick's
mechanical (ie: moving) parts and the electronics, Atari came up
with the idea of the hall-effect joystick which uses two sensor
devices which are based upon a magnetic-electric principle
discovered by Edwin Herbert Hall in 1879. Really, it's an
interesting phenomena, but I'll save time and skip the lesson. Regardless
of this interesting concept for a joystick design, it was a
failure. Atari went through three different designs to work
out the issues with the electronics -- the last being a successful
product in my opinion. However, they failed to correct the
mechanical problems associated with the device. And these were
such minor issues, I'm surprised they didn't bother with them.
Essentially, the joystick will wear out, just like the 720 joystick,
the Assault joystick and the "logo" joysticks. All
of these are based on the same basic design - all of which rely on a
little plastic "pivot ball" to bear the full brunt of
destructive force wielded by teenage gamers. In a home use
environment, this isn't really a concern. |
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After personally overseeing the
repair of these machines for no less than 5 years, I had a good
handle on what typically went wrong with them. The
joystick was the number one issue which far exceeded any other
issues. Second to that, the control panel itself had weak
spots to the right and left of the joystick and was prone to
cracking. Also, I'd like to note that there were problems with
RAM and one custom chip on the mainboard, too. Really, the
joystick was the main issue, hands down. I started to notice an increasing number of failing and/or
missing controllers. In the beginning, Atari, of course,
was happy to supply the required parts to no end. However,
within a very short time-span, they completely ran out of the necessary components
to maintain these joysticks. That was a big problem,
too. Since then, the
popular method of obtaining a controller has been to find a used one
in the collector circles (ie: RGVAC, EBAY, etc) which you can bet
came from a parted out machine. On occasion,
NOS controllers become available and they're typically grabbed up
quickly and for a very high price! In recent years, the only
reliable source of parts for this joystick has been at www.videogameparts.com.
But they are running low (or even out of stock in some cases) on the
parts they have for this joystick. Nobody has ever made any
reproduction parts for this joystick....yet. |

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Construction Progress
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04/01/07:
The Hall Effect controller reproduction project started in April
2007. I based our design on the last revision of the joystick
which was used in Escape from the Planet of the Robot
Monsters. Both the joystick itself and the Hall Effect board
reproduction parts we're working on are based on this OEM design. About
the only real changes I'll be making to this will be with the
materials used. I'll use Delrin for the plunger, pivot ball,
actuator and actuator half-ball. Delrin has better wear
characteristics than the nylon material that Atari used with the
original joystick, so our reproduction parts should perform much
better. I'll probably upgrade the lower housing to
aluminum...or at the very least thicken up the plastic areas inside
to give the pivot ball more surface area to brace against. Our
Hall Effect PCB assembly will be identical to the OEM version 3 PCB
assembly used by Atari as it is of sufficient quality. |
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04/01/07:
I generally purchase hardware items as the first step in creating a
new reproduction item. however, it appears that we're already
stocked up on all the parts needed for this project. That's a
great start!! |
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04/01/07: I
completed the 1000pc run of the plungers earlier last year, ahead of
this project. They're used in so many different versions of
Atari's joysticks and a bunch of people were asking for them, I
decided to run off a big batch of them to keep everyone happy.
Good news is that I don't have to worry about making this part for
the Hall Effect sticks! That's an even better start!
This part is used to automatically center the joystick. It's
one of several components which is prone to severe wear in the OEM
joysticks. Our reproduction version is made from machined
Delrin. Delrin is someone like the original material that
Atari used (Nylon) but it has much better wear properties. |
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05/29/07: 1000pc
batch of pivot balls have been completed. Pictured is a
small assortment of the freshly manufactured parts. They're
made of machined delrin and they should outperform the original part
substantially. Aside from this "upgrade" they're
identical to the OEM pivot balls made by Atari. |
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06/12/07: 2000pc
order for the special Hall Effect sensors just came in. They
appear to be a perfect match for what we've been trying to source
for the last month. Excellent news! This was the single
item which could have potentially halted the reproduction of this
joystick. We're all good now! |
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07/24/07: 1000pc batch
of Hall Effect PCB's fresh from fabrication. Pictured is are a
few stacks of "unstuffed" PCB's. They're nearly
identical to the OEM PCB's made by Atari. |
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Updates 04/01/07
- This project has officially begun. We have several OEM joysticks
in our possession, so we have all the parts necessary to measure up for
reproduction. Also, it looks like we're good as far as the hardware
goes -- we won't need to purchase anymore screws/nuts/bolts for this
one. Lastly, the plungers (part number 039712-01) were already
reproduced last year, so that's one less part we'll have to worry about. 05/29/07
- Ok, the very first part has been reproduced since the project
began. We now have a 1000 piece lot of pivot balls (part number
039716-01) available for the HE joystick as well as the 720 joystick, the
Assault joystick and the Logo joysticks (the one used on Gauntlet and
Gauntlet II). They're made from machined Delrin and they turned out
beautifully!! 06/12/07
- So I've been looking for the little Hall Effect sensors for the last
couple of months now with very little luck. I dug through the file
cabinets full of paperwork and found a secondary part number that Atari
used at one point when the original part became unavailable. I began
my search for the alternate part number and came up with a source for a
couple of thousand pieces. I bought them out on the spot. A
few days later (today), we now have them in stock. 06/20/07
- With the toughest part to find in hand, I've decided to work on the Hall
Effect PCB as the next step in this reproduction process. I've fired
up PCAD and away I go. 07/05/07
- The drawing of the PCB is finished and I'm ready to fab up a run of
maybe 1000 pieces of the PCB. 07/24/07
- As of today, the 1000pc run of the Hall Effect PCB's is completed.
All we need to do is machine the little white sensor blocks and assemble
the boards. 03/29/08
- This project BLOG has just been converted from notes and pics
taken awhile back and added to the website for reference. This
project is still in the beginning stages of production and only a few
items have been successfully reproduced. However, the design is
simple enough that we'll be able to complete this project with no
issues. However, it will take time since there are many parts to
reproduce. Our
final production model will be based on the final HE joystick version used
in Escape from the Planet of the Robot Monsters which Atari released in
1989. Our reproduction model will be 100% compatible and
interchangeable with the OEM joystick. |

If you would like to have your name added to the
interest list for the Hall Effect reproduction controller, please fill out the form below. You will be notified of any updates
as well as the completion of this project.
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