From: Humphreys, David (david.humphreys_at_honeywell.com)
Date: Wed Jun 27 2001 - 13:58:22 PDT
> Well, rather it would lead to a crash.. The NewtonOS storage system
> is rather redundant (for example, the system stores binaries with
> their size in store objects of a given size, hence the information is
> there twice (in the header of the object and in the store's catalog).
Yes, in a lot of cases, it would crash. Depending on what got trashed,
a whole number of things could happen.
> Not really. In sleep mode, every clock is disabled except the
> real time clock.
True. I thought I had powered down when I measured it. Seems like
I didn't.
> Except that I think that the 220 MHz limit is rather due to the ROM
> chips, I cannot disagree with what you are saying.
A number of parts have speed limits. Regardless of which one hits
the stops first, the outcome is still corruption. The 220Mhz value
is, perhaps coincidentally, the fastest speed that this chip is made in.
Lower speeds are just fallout from this.
>
> >Also, higher speed means higher power dissipation. This will
> >prematurely age the processor and other components.
>
> Although it won't generate much heat.
Overclocking will cause an increase in di/dt or rate of change of current
of the signals in the chip.
>
> >I am not telling anyone not to do this, I just wanted you
> >to make a more informed decision.
>
> I used PIXSolution's implant for several months. I had first some
> problems because it was too fast (bus errors in the ROM chips
> addresses AFAIR). I returned it to Oliver Harm, and I resoldered the
> fixed implant. It's true that you really get more comfort at a higher
> speed, especially with recognition. However, I never was totally able
> to switch the speed when the Newton was running (I was able when it
> was in low consumption mode with main clock at 50% frequency). And I
> haven't resoldered it in my new Newton because I need too much the
> serial port and the ethernet card (the Farallon isn't accelerator
> compatible) and also because of the other side effects (some random
> crashes, I once lost all the content of the internal store, plus the
> fact that indeed it decreases the lifetime of the unit).
>
> Paul
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