Re: [NTLK] Need recommendations for Newton calculator

From: Ed Kummel (tech_ed_at_yahoo.com)
Date: Fri Feb 22 2002 - 16:33:33 EST


OK, so I guess I'll ask.
Are you willing to part with any of these specially
made crystals? Not that I need them, but I'm sure that
the question would be asked.
Ed
web/gadget guru
http://newton.tek-ed.com (download Newton packages)
http://65.84.243.167 (my NPDS server)

--- "Humphreys, David" <david.humphreys_at_honeywell.com>
wrote:
> > -Stephanie
> > http://www.maksystems.com/newton/
>
> > I haven't tried the keyboard yet, but I suspect
> the answer is No.
>
>
>
>
> A standard Newton keyboard won't work but...
>
> ...if a different resonator is fitted in the
> keyboard that is the same
> ratio shift as the new/old crystal frequencies, then
> it will.
>
> i.e. old crystal = 3.6864MHz, new crystal =
> 4.9152MHz
>
> ratio = 4.9152/3.6864 = 1.333...
>
> Keyboard resonator = 4MHz
>
> New value = 4 * 1.333 = 5.333MHz
>
> Replace resonator and the keyboard will work when
> the newt is accelerated.
>
> The ratio is slightly different for a 5MHz crystal
> (1.3563368)
>
> You would then need a 5.4253472MHz resonator.
>
> The odd value resonators are not available off the
> shelf but can be made.
>
> I had some 5.33MHz ones made and they work as
> advertised.
>
> PCBman

=====
Just because you're a genius, doesn't make you a smart guy!
- The Powerpuff Girls -

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