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Okay, after looking at this more closely, the fix was simply changing the Sanni Reader from 5v to 3v. It now dumps the ROM and the checksum is correct and unchanging. This does give rise to a new question that I'm hoping a guru can help answer/explain. My understanding is the "issue" with repro flash was they used 3.3v chips while the SNES was a 5v system, and over enough time (or with a worn out system with bad caps or regulators), this voltage differential could potentially cause damage. It looks like this board now has a 3.3v<->5v regulator which I assume is to address that potential issue. If the above is correct, why is the cart reader having issues reading the ROM when set to 5v instead of 3v? Does the cart reader use a different pin (thus bypassing the 622k regulator) to dump the ROM? |
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I've recently seen a new board revision on some repros, H01-662k instead of the older H10-10k I used to see. One quirk I've found is these R01-662k boards always produce a different checksum when dumping the ROM. I've observed this on multiple boards, so I don't think it's just a case of a faulty ROM chip. Either the board design itself is faulty, or there's something funny going on between the cart reader and the chip when performing the dump.
Has anybody else seen these R01-662k boards, and have you seen a similar behavior?
On the bright side, it looks like the point of this revision is adding a 5v<>3.3v voltage regulator (the 662k chip near the bottom right of the battery). Although I have no idea if that single chip in the location actually solves the problem, but I've also never had any issues after playing around with repros for romhacks and translations for about a decade.
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