EFA1 and EFA2 for GBA.
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Published on ● Video Link: https://www.youtube.com/watch?v=GX0UAgTaPrQ
The EFA Linker I has RTC, storage of 256-512Mb of storage. The EFA Linker II has 1-2Gb of NAND flash, 256Mb of NOR flash, and RTC.