SD2SNES Rev. E1 Upgrade to Rev. H

This is an old rev. E1 SD2SNES cart, that I’ve bought several years ago from Krikzz.

SD2SNES Rev. E1
SD2SNES Rev. E1

SD2SNES did undergo some revision changes in the last couple of years. First there was Rev. F, that fixed some interference with 1CHIP units. Then there was Rev. G, that fed the DAC with +5V to improve the MSU-1 volume (and added some noise). And finally in Rev. H, the +5V change was reverted and an opamp added to fix the MSU-1 volume for good.
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