blgardne@esunix.UUCP (Blaine Gardner) (11/25/86)
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 7 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 Button 2 (Right)
8 Ground
9 +5 Volts
----------------------------------------------
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 | 7
8 4 | Ground 8
9 6 | +5 Volts 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 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) 582-5847kim@amdahl.UUCP (Kim DeVaughn) (12/02/86)
In article <250@esunix.UUCP>, blgardne@esunix.UUCP (Blaine Gardner) writes: > Converting the Wico track ball into an Amiga mouse compatible track ball > is a fairly simple procedure. > > [ ... stuff ... ] > > Wico Trackball #72-4545 > Wico Corporation > Consumer Division > 6400 W. Gross Point Road > Niles, Illinois 60648 > 800-323-4014 Thanks for all the info, Blaine ... here's some more info (and a plea)! I called the 800 number above last week, and got a "disconnect/not in service" intercept. Trying 800 information did get me the new/current 800 number for Wico though (sorry, I don't have it with me). Anyway, after talking to a couple of very pleasant receptionists, I ended up talking to a fellow named Eugene. He gave me the bad news ... alas, Wico has discontinued making the Trackball mentioned above (nor do they have any other model of Trackball). He did say that this product was originally for Commodore's and Atari's, which is why I'm cross- posting this to those news.groups. He suggested that I look on the shelves of various people who had at one time distributed the product ... he mentioned "Best", "Federated Somethingorother", and "Toys'R'Us". I've tried several "Best" and "Toys'R'Us" stores here in the Bay Area, but without success, so (here comes the plea), does anybody out there in net.land have one of these Trackballs that they'd be willing to part with. Or, does anybody know who might have one of these still in stock? If so, please email me, or followup to comp.sys.amiga. Thanks for any help! /kim -- UUCP: {sun,decwrl,hplabs,pyramid,ihnp4,seismo,oliveb}!amdahl!kim DDD: 408-746-8462 USPS: Amdahl Corp. M/S 249, 1250 E. Arques Av, Sunnyvale, CA 94086 CIS: 76535,25 [ Any thoughts or opinions which may or may not have been expressed ] [ herein are my own. They are not necessarily those of my employer. ]