Re: Kraft Joystick Question!

[rubywand@aol.com (RUBYWAND)]

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