12906Re: The 1802 Elf and Battery Backup
- Mar 21, 2013--- In email@example.com, Lee Hart <leeahart@...> wrote:
>I was able to find it. Thanks!
> Indeed, it was in one of their original articles.
>The circuitry needed
> is little more than the RAM, two diodes, and a pullup resistor on the
> RAM's "write" pin so it won't accidentally float low.
> On the Membership Card, I found that I didn't even need the diodes. I
> could battery backup *everything*, and still hold data for a year on two
> AA cells.
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