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Re: The 1802 Elf and Battery Backup

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  • jdrose_8_bit
    ... I was able to find it. Thanks! http://www.incolor.com/bill_r/elf/html/elf-2-39.htm
    Message 1 of 20 , Mar 21, 2013
      --- In cosmacelf@yahoogroups.com, Lee Hart <leeahart@...> wrote:

      >
      > Indeed, it was in one of their original articles.
      >

      I was able to find it. Thanks!
      http://www.incolor.com/bill_r/elf/html/elf-2-39.htm

      >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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