Making a Batteryless Save (FRAM) MBC3 Flash Cart with RTC (yet another one)
Channel: makho
Date: 2020-01-29

By using FRAM instead of the original SRAM, the battery is only required for RTC functionality. If the battery is removed, the cart will still hold a save. This kind of cart is perfect for Pokemon ROM hacks. 

Go ahead and check out HDR's github page for more info, parts lists, and gerbers (PCB files): https://github.com/HDR/MBC3-Flashcart

This PCBs must be made in 0.8MM ENIG. Color is personal preference. HASL WILL NOT work (long term). 

I've made one of these before except last time it was the retroreboot version with 1206 components: https://www.youtube.com/watch?v=INHfbdt83pw