macsehw/firmware/rtc/README.md

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# RTC
This directory contains a work-in-progress firmware for implementing a
drop-in replacement for the RTC on ATTiny85 microcontroller. I've
made a few modification to this particular copy, but it still needs
more work to be fully functional.
Source, Visited 2020-08-05:
* https://www.reddit.com/r/VintageApple/comments/91e5cf/couldnt_find_a_replacement_for_the_rtcpram_chip/e2xqq60/
* https://pastebin.com/baPZ4nN4