hpr3765 :: Fixing clock events in GBA pokemon cartridges

Tinkering with the RTC (Real Time Clock) hardware on Gameboy Advance cartridges

Hosted by Celeste on Friday 2023-01-06 is flagged as Clean and is released under a CC-BY-SA license.
Tags: nintendo,gba,swapping battery,RTC clock,savefile editing,game boy advance.

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Part of the series: Hobby Electronics

Building electronic devices and kits, repairing electronics and learning about components and their uses.

Pokemon games for the GBA (Game Boy Advance) have an internal RTC chip with a coin battery to keep track of the time when the console is powered off.
What happens when the internal battery runs dry? How to fix it?
Is this enough to completely restore calendar-based events?

Tools:
- https://github.com/megaboyexe/GBA_RTCRead
- https://gbatemp.net/threads/how-to-reset-the-rtc-in-gba-pokemon-games-after-replacing-the-battery.558620/
- Swapping battery instructions https://www.youtube.com/watch?v=1piXd3ffwug
Additional resources:
- https://www.youtube.com/watch?v=jzauCmOvF_U (few mistakes about here)
- https://www.youtube.com/watch?v=TrIAyAKg2S0 (followup videos with corrections)

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