Re: Working Joystick wanted

[dan@cafws4.eng.UCI.EDU]

In article <1993Dec16.150624.32255@news.weeg.uiowa.edu>,
Steven Nelson <snelson@umaxc.weeg.uiowa.edu> wrote:
>> 	Hello.  Does anyone have a _working_ joystick for the Apple ][ series
>> (16-pin or 9-pin okay) they'd be willing to part with?  My little brother's
>> joystick is having a problem I've seen a lot with Apple sticks.  When you
>> press all the way to the left, the hardware will think you're pressing to
>> the right, and if you press all the way up, it reads down.
>
>It sounds like you have an early Apple IIe.  Mine does the same thing.  My

	Yes, my brother's //e must be a 1983 model - the case lid is the II+
style rather than the later //e style.  My //e is a later model (1984? 85? -
both Rev. D though...).  Now, with my computer, this only happens with certain
joysticks (old ones?).  I assumed this was the case with my brother's as well,
but perhaps it'll do this even with my working CH?  I'll have to test that...

>newer IIe's and my II+'s work fine with joysticks.  The only fix I've found
>is to stick ~100 ohm resistors in serial with the potentiometers.  This

	Where do you stick these?  On which wire(s)?  In the joystick or in the
machine?

>just enough resistance to the pdl circuits on the motherboard that they don't
>timeout too fast (slow?) for the firmware routines.  It was documented in a
>Apple technote at one time.  The (then) new IIe had a 100 ohm resistor on
>board after a capacitor rather than before the capacitor (or vice versa) like
>the II+ had.  Apple fixed this on the next revision of the IIe motherboard.

	Okay, so the signal chain after the fix will be resistor->capacitor->
resistor?  This won't be too much resistance, will it?  [BTW, thanks a lot
for your post, Steve.]

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| Dan Harkless                | "The sore in my soul                         |
| dan@cafws1.eng.uci.edu      |  The mark in my heart  ->  Front 242,        |
| dharkles@bonnie.ics.uci.edu |  Her acid reign..."        Tragedy >For You< |
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