Re: [stella] Programming Contest?

Subject: Re: [stella] Programming Contest?
From: Chris Wilkson <ecwilkso@xxxxxxx>
Date: Sat, 27 Oct 2001 02:35:59 -0400 (EDT)
On Fri, 26 Oct 2001, Joe Grand wrote:

> If I remember correctly, the driving paddles are actually rotary encoders.
> So CO10802 isn't just a rotary switch, but actually has one or two small
> discs inside it which will generate a 4-bit sequence (quadrature output, I
> think it's called). By looking at the sequence, one can determine which
> direction the device is turning. Looking at the schematic, only 2 of those
> pins are used to generate the sequence..

Ok.  This coupled with the schematic confirm my memory.  And I believe that
schematic is from the VCS Field Service Manual, but I don't have time to
check right now.  The 2 bits used are the least significant bits of the
encoder.  (Yes, it is definitely a rotary encoder.)  So the pattern will
repeat 4 times if you move the controller through one full rotation.


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