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Re: Need Joystick for GS
From: rubywand@aol.com (RUBYWAND)
Reply to: RUBYWAND
Date: 5 Aug 1996 05:00:07 -0400
Organization: America Online, Inc. (1-800-827-6364)
Newsgroups:
comp.sys.apple2
Followup to: newsgroup(s)
References:
<3202CF83.130A@inlink.com>
In article <3202CF83.130A@inlink.com>, "Doug S." <dougs@inlink.com>
writes:
>
>Can anyone supply me with the pinout info for converting a PC joystick to
>Apple II? I have a spare PC stick, and the Apples are hard to find
locally.
>
>
Sure. The stuff below is condensed from an article in the Spring
issue
of II Alive:
To PC Stick To Apple II
(15-pin female connector) (9-pin male connector)
[1] [4] and [5] --------------------------- [2] +5V
[2] --------------------------------------------[7] Button 0
[3] --------------------------------------------[5] X-axis
[6] --------------------------------------------[8] Y-axis
[7] --------------------------------------------[1] Button 1
[3] Ground
On the 9-pin Apple II side ...
add 680 Ohm resistor between [7] & [3]
add 680 Ohm resistor between [1] & [3]
add .01 uF cap between [5] & [3]*
optional: add 50K-100K trim pot in series with the cap
add .01 uF cap between [8] & [3]*
optional: add 50K-100K trim pot in series with the cap
- NOTE: The Capacitors compensate for smaller R range of PC
sticks.The C values are approximate. For standard 100K Ohm
PC sticks, .01 uF pretty well guarantees you will be able to
cover the full Apple II X and Y range (0-255).
Values of .01 uf (X-axis) and .005 uF (Y-axis) worked
well on the PC "FlightStick" when plugged into our Apple II+.
Most likely, you will find that the a stick tops-out too early
in the X-max and/or Y-max direction. For best control precision,
what you want is for extreme values to occur near the extremes
of stick movement:
X (horizontal) Left= 0 Right= 255
Y (vertical) Up= 0 Down= 255
This way, you have lots of active swing which makes graphics
work and playing most games much easier.
For adjusting, use a program which continuously reads and
displays X and Y stick values. The program below does this and
displays "B0" when Button 0 is pushed and "B1" when Button 1
is pushed. Do a CTRL-C to exit.
20 PRINT "X= "; PDL(0); TAB(15); "Y= ";PDL(1); TAB(30);
30 IF PEEK(49249)>127 THEN PRINT " B0";
40 IF PEEK(49250)>127 THEN PRINT " B1";
50 PRINT: GOTO 20
Experiment with capacitance values between .002 uF
and .01 uF to get the best 'spread'. For easier fine-tuning,
add the 50K-100K trim pots in series with each capacitor.
The converter I built fit inside heat-shrink tubing. Putting it
in a small plastic box may be better. You can mount the
trim pots (and/or switches with fixed "trim resistors") and
select between settings for a 'Fast', short swing, 'hot' Game
Stick and a 'Normal', full swing, 'cool' Game/Graphics Stick.
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From: rubywand@aol.com (RUBYWAND)
Newsgroups: comp.sys.apple2
Subject: Re: Kraft Joystick Question!
Date: 6 Sep 1996 11:28:10 -0400
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In article <322ee39d.323258278@news.concentric.net>, wernst@cris.com
(Warren "Llama" Ernst) writes:
>.... What did you do about the buttons? I built one of these years ago,
but
>I found that the Apple expects the buttons to be "push to close
>connection" and the PC expects teh buttons to be "push to open
>connection" (or vice versa, its been a while). Someone suggested an
>inverter, but I just went out and bought the correct modem.
>
>Won't this converter still give you button problems?
To PC Stick To Apple II
(15-pin female connector) (9-pin male connector)
[1] [4] and [5] --------------------------- [2] +5V
[2] --------------------------------------------[7] Button 0
[3] --------------------------------------------[5] X-axis
[6] --------------------------------------------[8] Y-axis
[7] --------------------------------------------[1] Button 1
[3] Ground
On the 9-pin Apple II side ...
add 680 Ohm resistor between [7] & [3]
add 680 Ohm resistor between [1] & [3]
add .01 uF cap between [5] & [3]*
optional: add 50K-100K trim pot in series with the cap
add .01 uF cap between [8] & [3]*
optional: add 50K-100K trim pot in series with the cap
The 680 Ohm resistors take care of the problem. Each resistor is
running from a Button to GND. The other end of each Button goes to +5V.
+5V
|
|
X Button Switch
|
|________ 'Button output to Apple'
|
Z
Z 680 Ohm resistor
Z
|
GND
680 Ohms holds a button's output to a logical 0. Pressing a button
sends +5V (logical 1) to the output.
Rubywand