I tried that a few months ago, but it looks like those speed selection
pins are hard wired inside the chip to 162 MHZ. I did every single
combination, higher and lower speeds, but it would never change, or at least
i couldn't notice the difference and that program for testing the speed
didn't show anything.
There's also a big "162" printed on the chip.
Indeed, it's not an easy task to rewire the four pins but I *had* to try
:-)
Daniel Padilla
>
> Just a quick technical question that someone who knows the architecture
> of the Newton better than I may be able to answer.
>
> I have read several articles on web sites about home-brew overclocking
> of the SA110 in an MP2x00. In all cases so far it looks like the answer
> is simply to wire in a new, slightly faster clock crystal in parallel
> to on of the original speed, and have a switch to slect between them.
> This may have the advantage of simplicity, but as noted has the down
> side that the rest of the system is sped up, which messes with the
> serial port, IR port and sound system etc.
>
> Why do none of these mods simply change the SA110's internal clock
> frequency multiplier? Without changing crystals it should be possible
> to overclock up to 287MHz and not have any trouble with the rest of the
> system. Of course not all SA110s would be stable at that speed.
>
> Perhaps it is too difficult to get to the four appropriate pins on the
> chip?
>
> Just curious.
>
> Julian.
>
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>
-- This is the NewtonTalk list - http://www.newtontalk.net/ for all inquiries List FAQ/Etiquette/Terms: http://www.newtontalk.net/faq.html Official Newton FAQ: http://www.chuma.org/newton/faq/
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