carl@umd5.umd.edu (Carl Symborski) (02/16/91)
Saw a few requests for trackball hacks and I rembered a few posts from
the good old days. I have tried the Wico hack and successfully been using
it for the past 4 years. Don't know about the Atari information. Anyway
the original postings are attached....
Cheers!
Carl
<><><><><><><><><><><><><><><>
Article 345 of comp.sys.amiga:
Relay-Version: version B 2.10.3 4.3bds beta 6/6/85; site umd5
Path: umd5!cvl!mimsy!seismo!ut-sally!utah-cs!utah-gr!uplherc!esunix!blgardne
From: blgardne@esunix.UUCP (Blaine Gardner)
Newsgroups: comp.sys.amiga
Subject: trackball hardware hack VERSION 2 BUG FIX & ATARI TIPS
Message-ID: <259@esunix.UUCP>
Date: 5 Dec 86 15:26:06 GMT
Date-Received: 9 Dec 86 11:57:18 GMT
Lines: 245
Keywords: Wico trackball mouse VERSION 2.0 (BUG FIX & ATARI NOTE)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
I have posted a correction to my trackball modification, but just to be
safe, here is the entire thing again, WITH THE CORRECT DB9 PINOUTS!!!!
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Ok, here it is, sorry I took so long to post it. I have tried to make this
understandable, if you don't know what an LM 339 or a DB9 is, maybe you
shouldn't try this.
---------------------------------------------------------------------------
Wico track ball modification.
Converting the Wico track ball into an Amiga mouse compatible track ball
is a fairly simple procedure. But if you are uncomfortable with a soldering
iron, get some competent help.
You could damage your Amiga if you make a mistake when
assembling this project! You could also void your Amiga
warranty! You will definitly void your trackball warranty!
YOU HAVE BEEN WARNED!!!
Ok, now that that's out of the way here are the gory details.
The stock trackball contains a small pc board, this will be removed and
replaced with one containing an LM 339 quad comparator.
The comparator simply converts the output of the opto-coupler to a TTL
level pulse. Both the X and Y axis use two emitter-detector pairs. The
output of each of these detectors is fed through one of the comparators.
The output of the comparator is then fed to the Amiga's mouse port. Since
the output of the trackball will be identical to the mouse's output, the
modified trackball will work with ALL software that uses the mouse.
Here we go!
Remove the 6 (six) screws from the bottom of the trackball case and
open it (right-side-up please). In the lower-right corner there is a small
pc board with two connectors. Remove the board & connectors. You can toss
the board, and the cable that has the joystick connector. (The cable only
has 7 wires and we need 8. You can scrounge the 11 pin male header off of
the board.)
Cut a piece of perf board the same size as the original board. Just
make sure it fits in the same place as the original. The plastic grooves
will hold it perfectly.
Two cautions here: make sure the top can be screwed down without hanging
up on the new board, and make sure all your components will clear the
standoff near the board!
Using the (crude) schematics below, wire up the circuit. You will need to
drill a hole in the case to mount a second switch (for the right button).
Make sure the second switch will clear all existing hardware! Wire the second
switch between ground and pin 9 on the DB 9 connector.
It is a good idea to place a medium sized capacitor (10-20 uf) across +5 and
ground where power enters the perf board.
Parts List:
Wico Trackball #72-4545
Wico Corporation
Consumer Division
6400 W. Gross Point Road
Niles, Illinois 60648
800-323-4014
Joystick Extension Cord Radio Shack #276-1978
LM 339 Quad Comparator Radio Shack #276-1712
14 pin DIP Socket Radio Shack #276-1999
Soft-Touch Switch Radio Shack #275-1566
Perf Board
11 pin Male Header (can be removed from Wico)
10 - 20 microfarad capacitor (12V or higher)
Resistors (1/4 or 1/8 Watt, 5% tolerance)
280 Ohm (4 each)
3.3K Ohm (4 each)
6.8K Ohm (4 each)
100K Ohm (4 each)
---------------------------------------
Wico TrackBall Internal Connector
(Color code assumes Wico is consistent in their wiring.)
1 Pushbutton White
2 +5 (Y-axis) Red
3 +5 (X-axis) Red
4 Ground (Pushbutton) White
5 Ground (X-axis) Black
6 Ground (Y-axis) Black
7 N/C ---
8 Y-axis output Violet
9 Y-axis output Blue
10 X-axis output Green
11 X-axis output Yellow
---------------------------------------
Pinouts for LM 339
------------------------
| 14 13 12 11 10 9 8 |
) |
|. 1 2 3 4 5 6 7 |
------------------------
1 Output 2
2 Output 1
3 +5 Volts
4 Input 1-
5 Input 1+
6 Input 2-
7 Input 2+
8 Input 3-
9 Input 3+
10 Input 4-
11 Input 4+
12 Ground
13 Output 4
14 Output 3
---------------------------------------
Amiga Mouse Connector (DB 9 Female)
-------------
\ 5 4 3 2 1 /
\ 9 8 7 6 /
---------
1 V pulse
2 H pulse
3 VQ pulse
4 HQ pulse
5 N/C
6 Button 1 (Left)
7 + 5 Volts
8 Ground
9 Button 2 (Right)
----------------------------------------------
Connections from Wico | Connections from LM 339
11 pin socket to LM 339 | to DB9 (Mouse port connector)
|
Wico -> LM 339 | LM 339 --> DB9
---- ------ | ------ ---
1 (to pin 6 on DB9) | 2 1
2 3 \__+5 Volts | 13 2
3 3 / | 1 3
4 12 \ | 14 4
5 12 >--Ground | N/C 5
6 12 / | (pin 1 on Wico) 6
7 N/C | +5 Volts 7
8 4 | Ground 8
9 6 | 9
10 10 |
11 8 |
---------------------------------------
O +5 Volts O +5 Volts
| |
\ \
3.3K Ohm / / 6.8 K Ohm
\ 100K Ohm \
| |
+-----/\/\/\/-------+ |
| /| | |
| / +|---+------+ (Pins 5,7,9,11)
| /1/4 | |
Output to /__|________/ LM | |
Amiga \ \ 339 | \
(Pins 1,2,13,14) \ | / 280 Ohm
\ -|--+ \
\| | |
| |
| |
Input from ball >-------+ -----
(Pins 4,6,8,10) | ---
| -
\
3.3K Ohm /
\
|
|
|
-----
---
-
-------------------------------------------------------
There it is! The above information was obtained from the Amiga Hardware
Reference Manual, and from tearing apart my mouse & trackball and trace-
ing out the schematics myself. (Mostly from tearing my hardware apart!)
Any errors in the above information are mine (but for a few hours work
they can be yours too! |^) ), not Evans & Sutherland's. They are kind
enough to pay me to play with their computers, they have no control over
my ramblings here on usenet.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
The above infomation is the correct version. In my first posting + 5 volts
and button 2 were switched on the DB9 pinouts.
There have been a lot of inquiries about doing the same modification on
the Atari 2600 trackball. I hadn't seen the Atari untill two days ago, but
I can now tell you that the same procedure will work for it. In fact it is
a little easier on the Atari trackball because the LM339 is already present.
Just remove all the components from the board except the 339, the supply
voltage filter (inductor + electrolytic cap near the 6 pin header), and
resistors R9 - R18. Actually you'll have to remove those too because they
are the wrong values, and the 339 socket blocks several traces that need
to be cut. (As I remember 430K and 10K should be swapped for 100K and 3.3K
respectively.)
The biggest problem is that Atari wired the 339 as a non-inverting
comparator, and Amiga uses an inverting comparator. So you'll have to CUT
AND JUMPER (those that flinched may leave the room) to get the inverted
configuration (see above data for the correct circuit).
I don't plan to do a detailed plan for the Atari trackball, if the above
information doesn't mean much, don't try it yourself.
This general plan should work for all trackballs that use a pair of opto-
couplers on each axis. The old TG trackball for the Apple II (and probably
other computers) will NOT work since it uses a pair of pots.
I hope this helps all you hardware hackers that can't live without a real
trackball. Have fun, and don't blow up your Amiga!
--
=================================================
"The Admiral is well aware of the regulations..."
=================================================
Blaine Gardner @ Evans & Sutherland
{ihnp4, decvax}!decwrl!esunix!blgardne
560 Arapeen Drive Salt Lake City, Utah 84108 (801) 582-5847
Article 4656 of comp.sys.amiga:
Path: umd5!mimsy!oddjob!uwvax!husc6!mit-eddie!mit-amt!mit-caf!rajeev
From: rajeev@mit-caf.UUCP (Rajeev Jayavant)
Newsgroups: comp.sys.amiga
Subject: Atari Trackball Modification
Message-ID: <367@mit-caf.UUCP>
Date: 8 Jun 87 06:22:47 GMT
Reply-To: rajeev@mit-caf.UUCP (Rajeev Jayavant)
Distribution: na
Organization: Massachusets Institute of Technology
Lines: 159
For those of you who've been waiting for an inexpensive trackball,
here are the modifications for converting an Atari trackball (model
CX22) to emulate an Amiga mouse. This device is different from the
Wico trackball which has been previously mentioned on the newsgroup.
One nice feature of the Atari trackball is a joystick emulation mode
in which it can be used in place of a joystick. It can be plugged
directly into the Amiga and used in the joystick mode. Unfortunately
a few modifications are needed to use it in place of the mouse.
KayBee toy stores in the Boston area currently have these things on
sale for $9.99 so you should be able to have a fully functional
trackball for well under $20.
For those who grow squeamish at the sight of a dismantled trackball, it
is possible to build an adapter that can be plugged in between the
Amiga and the trackball. The only disadvantage of the adapter
apporach is that the second trackball button cannot be used as the
right mouse button. Please send me email if you would like
instructions for constructing the in-line adapter.
Disclaimer: While I beileve that the instructions provided here are
correct, I do not claim any responsibility for the results of your
actions. I seriously doubt you can injure your Amiga even if you make
a mistake in construction; I do not know if the same can be said for
the trackball.
Now for the moment you've all been waiting for. You will need a
74LS86, a 74LS157, and one Radio Shack joystick extention cord (or
equivalent 9 conductor cord with a female DB9 connector on the end).
Note: Radio Shack does not carry the IC's, but they should be commonly
available.
The cord is necessary because the trackball comes with a 7 conductor
cord, making it impossible to use both buttons separately.
Unfortunately all the Radio Shacks in my area are out of the extention
cord thus I had to reuse the cord that came with the trackball and do
not yet have a functioning right mouse button.
Open the trackball by removing the four screws on the bottom of the
case. Separate the two halves of the case by holding on to the bottom
half and pushing a screwdriver through one of the two holes near the
middle of the case (they look like they should have recessed screws in
them but there aren't any screws). Be careful when separating the two
halves otherwise the ball will land on your foot and roll across the
floor :-).
In the upper left corner there is a 6 pin connector to which the
incoming cable is attached. Remove the connector to expose the six
signal pins. I will refer to these as T1 thru T6 (from left to
right). The signals on the pins are:
Pin | Joystick Mode | Trackball Mode | Wire Color
----+---------------+--------------------+-----------
T1 | left | vertical direction | green
T2 | right | vertical pulse | violet
T3 | up | horizontal dir | white
T4 | down | horizontal pulse | blue
T5 | +5 V in | +5 V in | orange
T6 | ground | ground | black
----+---------------+--------------------+-----------
The horizontal and vertical pulses (T4 and T2) can be fed directly to
the Amiga (to the right pins of the game port, of course), but the
HQpulse and VQpulse required by the Amiga must be constructed from
the available signals. The HQpulse is simply the XNOR of the Hpulse
and the Horiz. direction. Similarly the VQpulse is the XNOR of the
Vpulse and Vert. direction. The two XNOR gates are implemented using a
74LS86 (quad XOR gate). The 74LS157 is a quad 2-to-1 multiplexer that
is used to preserve the joystick emulation mode.
CONSTRUCTION NOTES
------------------
There is plenty of room inside the trackball case, so you can choose
just about any construction method you desire. I chose to wire wrap
the circuit on a tiny piece of perfboard and mounted it in the right
side of the case. I attached the circuit to the trackball by wire
wrapping directly onto the posts exposed by removing the six-pin
connector. I soldered the incoming cable onto a DIP header (also from
Radio Shack) which is then plugged into a third socket on my little
circuit board. Being able to easily remove the cable is a big plus
since you can keep it out of your way 'til the very end.
The schematic below shows how to construct the little circuit board.
The pins on the gameport connector are referred to as P1 thru P9.
Connect the circuit board to the appropriate pins (T1-T6 and P1-P9).
The joystick/trackball switch is the little slide switch near the
lower left corner of the trackball (top view). You will need to
solder a little wire to the bottom-most of the three contacts on the
switch.
To get to the contacts on the bottom of the switch, you will need to
remove the PC board in the trackball. Lift out the "cue ball" and the
two rollers it is resting on. Then remove the two screws holding down
the PC board and lift it out. Reverse the process after you've
attached the wire to the switch contact with a dab of solder.
To wire the buttons, do the following:
1) Cut the red wire connecting the two switches together.
(also cut the red wire leading to the incoming cable).
2) Connect the black wire to ground (T6).
3) connect the red wire from the left button to P6.
4) connect the red wire from the right button to P9.
SCHEMATIC
---------
Joystick/Trackball Switch -----------+
(Bottom contact) |
T2-----------------------+-------+---|--------------+
T1---------------------+ | | | |
| | | | |
T3------+--------------|-|-----+ | +-|--------------|--------------P3= VQpulse
| | | | | | | |
T4----+-|--------------|-|-----|-|-|-|--------------|--------------P2= Hpulse
| | | | | | | | |
T5--+-|-|------------+-|-|-+---|-|-|-|------------+-|--------------P7= +5V
| | | | | | | | | | | | |
| | | +--------+ | | | | | | | | +--------+ | |
| | +-|1 7 14|-+ | | | | | | +-|1 7 16|-+ |
| +---|2 4 13|---+-|-|---|-|-|---|2 4 15|---|-+
| +-|3 L 12|-----+ | +-|-|-|---|3 L 14|---+ |
| +-|4 S 11|-+ | | | | +---|4 S 13|-+ |
+-----|5 8 10|-+ | | +-|-----|5 1 12|-|---|------------P4= HQpulse
+---|6 6 9|-------+ | +-----|6 5 11|-|---+
| +-|7 8|---------+ +---|7 7 10|-|---+
| | +--------+ | +-|8 9| | |
| | | | +--------+ | |
+-|--------------------------|-|------------+ |
| +-|----------------|-----------P1= Vpulse
T6=GND--+-------+--------------------+----------+-----+-----------P8= GND
| |
+-----------+ +------------+
|Left Button|----+ |Right Button|----------P9= button 2
+-----------+ | +------------+
+--------------------------------------P6= button 1
TROUBLESHOOTING
---------------
Reassemble the trackball after making all connections. Set the
joystick/trackball switch to "trackball" and try using the trackball
in place of the mouse. If all has gone well, your pointer should move
smoothly in response to the trackball movement.
If there is no movement or the movement is *very* jittery,
double-check your connections. It is very likely that something is
not connected or that two signals have been switched. It may help to
try out the joystick emulation mode if you think signals have been
crossed (it'll be easier to tell which signals have been crossed!).
Good Luck!
Rajeev
--
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
Rajeev Jayavant Quote: "Excuse me. I've lost my marbles." (P. Opus)
ARPA: rajeev@caf.mit.edu UUCP: ....!mit-eddie!caf!rajeevblgardne@javelin.es.com (Blaine Gardner) (02/17/91)
Boy, that's an _old_ version of the trackball hacks! There's a newer
version (with a bunch of Atari trackball hacks) available for ftp as
amiga/hardware/trackballs.lzh
If you can't ftp, e-mail me and I'll send it to you.
--
Blaine Gardner @ Evans & Sutherland 580 Arapeen Drive, SLC, Utah 84108
blgardne@javelin.sim.es.com or blgardne%javelin@dsd.es.com
...dsd.es.com!javelin!blgardne or {decwrl, utah-cs}!esunix!blgardne
DoD #0046 My other motorcycle is a Quadracer. BIX: blaine_gJKT100@psuvm.psu.edu (JKT) (02/18/91)
In article <1991Feb17.053300.16743@javelin.es.com>, blgardne@javelin.es.com (Blaine Gardner) says: > >Boy, that's an _old_ version of the trackball hacks! There's a newer >version (with a bunch of Atari trackball hacks) available for ftp as >amiga/hardware/trackballs.lzh > >If you can't ftp, e-mail me and I'll send it to you. E-mail to you bounces. Could you A) send it to me (at one of the addresses below) or B) post the site from which it can be FTP'ed? Thanks! Kurt -- ----------------------------------------------------------------------- || Kurt Tappe (215) 363-9485 || With. Without. And who'll || || 184 W. Valley Hill Rd. || deny it's what the fighting's || || Malvern, PA 19355-2214 || all about? - Pink Floyd || || jkt100@psuvm.psu.edu --------------------------------------|| || jkt100@psuvm.bitnet jkt100%psuvm.bitnet@psuvax1 QLink: KurtTappe || -----------------------------------------------------------------------
blgardne@javelin.es.com (Blaine Gardner) (02/19/91)
JKT100@psuvm.psu.edu (JKT) writes: >In article <1991Feb17.053300.16743@javelin.es.com>, blgardne@javelin.es.com >(Blaine Gardner) says: >>Boy, that's an _old_ version of the trackball hacks! There's a newer >>version (with a bunch of Atari trackball hacks) available for ftp as >>amiga/hardware/trackballs.lzh >>If you can't ftp, e-mail me and I'll send it to you. >E-mail to you bounces. Could you A) send it to me (at one of the addresses >below) or B) post the site from which it can be FTP'ed? Thanks! Oops, it's on ab20, forgot that little detail. I've never had any luck mailing to bitnet sites, but I'll try anyways. -- Blaine Gardner @ Evans & Sutherland 580 Arapeen Drive, SLC, Utah 84108 blgardne@javelin.sim.es.com or blgardne%javelin@dsd.es.com ...dsd.es.com!javelin!blgardne or {decwrl, utah-cs}!esunix!blgardne DoD #0046 My other motorcycle is a Quadracer. BIX: blaine_g
erk@americ.UUCP (Erick Parsons) (02/24/91)
I did this modification and it works great ! Thanks Blaine for the mail and everyone else for the replies ! -- -------------------------------------------------//------------------------- (ames att sun)!pacbell! ----> sactoh0!pacengr!americ!erk Multitasking, ucbvax!ucdavis!csusac! --/ // Never leave uunet!msac! -/ Erick Parsons \Sacramento Ca Home Without it --------------------------------------------\X/----------------------------- Please Don't Wait...
barrett@aminet.UUCP (Keith G. Barrett) (02/28/91)
Could someone also email me the atari trackball mods? Thanks!
--
Keith Barrett
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The statements expressed in this | UUCP: portal.com!gdc!aminet!barrett
message are solely mine and do not | Internet: barrett@aminet.gdc.portal.com
represent the opinions or views of |Alternate: barrett@ctoavx.enet.dec.com
any employer. "My life is my own" | //
- The Prisoner | \X/ "The Amiga is really a picoVAX"
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~