[HH] The Mystery Of Zombie RAM

[Tom Metro]

http://hackaday.com/2014/03/06/the-mystery-of-zombie-ram/?utm_content=buffer876fb&utm_medium=social&utm_source=twitter.com&utm_campaign=buffer

  Josh had a little project where he needed to keep a variable in RAM
  while a microcontroller was disconnected from a power source. ... He
  found an ATTiny can keep the RAM alive for a variable amount of time -
  somewhere between 150ms and 10 minutes. Wanting to understand this
  variability, he decided to solve the mystery of the zombie RAM.


[Spoiler hint: they key to getting the RAM to stay working for up to 10
minutes was having an LED in the circuit.]

 -Tom