Re: Question on CH Mach III joysticks

[Michael J. Mahon <mjmahon@aol.com>]

"Bill Garber" <willy46pa@comcast.net> wrote:
> "Michael J. Mahon" <mjmahon@aol.com> wrote in message
> 333722398335260254.430904mjmahon-aol.com@news.giganews.com">news:333722398335260254.430904mjmahon-aol.com@news.giganews.com...
>> Antoine Vignau <antoine.vignau@laposte.net> wrote:
>>> On 15 août, 02:31, Eric Rucker <bhtoo...@gmail.com> wrote:
>>>> So, I know that there were both PC and Apple II versions of the CH Mach III.
>>>> 
>>>> And, I know that PC joysticks are (typically) 100k ohm, whereas Apple II
>>>> joysticks are 150k ohm. However, I've seen that some PC joysticks DO use 150k ohm pots.
>>>> 
>>>> So, what pots did the Mach III use, in both Apple and PC versions?
>>> 
>>> I have one but I don't feel confident in opening it to give the answer
>>> to you.
>>> I've been using it for 25 years now and I want it to continue!
>>> 
>>> Sorry,
>>> Antoine
>> 
>> You can measure the maximum resistance without opening it by connecting an
>> ohmmeter to the appropriate pins of the connector. (After all, this is how
>> the computer measures the resistance.  ;-)
> 
> Michael,
> 
> This won't tell you what hardware is inside. Extra circuitry would be used to obtain
> the proper range of resistance required by the inputs.  You could actually use quite
> larger POTs and add capacitance to bring the range down.  :)

The internal circuitry doesn't matter, as long as it doesn't include a
supplementary capacitor.  Only the resistance at the terminals is important
in the absence of an internal capacitor. 

-michael - NadaNet 3.1 and AppleCrate II: http://home.comcast.net/~mjmahon