Removing RTC from Theft-Deterrence

John Watlington wad at
Wed Jul 7 16:48:47 EDT 2010

On Jul 7, 2010, at 4:01 PM, C. Scott Ananian wrote:

> Since "RTC security" is being discussed again, I'm going to repost two
> relevant proposals from "the good old days".  First: on making
> theft-deterrence a "feature"; then technical details of a $0.16 change
> to remove RTC dependence from the theft-deterrence feature.
> Unfortunately, the specific circuit changes required are XO-1
> specific; presumably some slightly different version is needed for XO
> 1.5, XO 1.75, etc.  I vaguely remember wad saying he managed to make
> this change in hardware at some point; I don't know if corresponding
> software was ever written.

The EEPROM needed for this was included in early XO-1.5 prototypes,
but was dropped from production due to the lack of software making use
of it.   It could be added back to any XO-1.5 SKU for a slight cost increase.


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