I guess I should also mention that it would be possible to use 2 x 27C322 (or 1 x 27C322 and 1 x 27C160) but that would require 3 logic ICs to the get the 16-bit memory working on the SNES 8-bit bus. If Buy IC China doesn't, it shouldn't be too hard to accomplish and share on OSH Park. That said, I've been thinking about making an adapter for 3v memory anyway. I wouldn't recommend using 3v memory unless it's done properly. The example from Twitter, we can't see if there's any level shifting going on on the bottom side of the board. You can always go old school and use 6 x 27C080 and a 74LS138, this is how people use to make Tales of Phantasia repros until they started using 5v flash memory.Ī single 64 Mbit flash would be a slick solution, but as you pointed out, it's gonna be 3v memory.
The 2 x 29F032 (or 1 x 32 Mbit and 1 x 16 Mbit) sandwich method would probably be the easiest solution for now. I can think of 3 ways of doing this, and you already mentioned 2 of them. I’m wondering if anybody has tackled the larger Rom sizes (above 32Mb) excluding Star ocean as thats SDD-1 & what their methods are? I’ve been speaking to the guys BUYICNOW and they’re quite happy to design a similar TSOP48 to snes 36 mask Rom adapter so waiting to here back about this. I’ve tried asking the guy that did it over but he’s keeping shtumn!!!
The 2 TSOP40 chip sandwich method in my eyes looks to be fine as they’re both 5v and only needs a couple of extra wires to the Mad-1 decoder, but the 1 chip method which is preferable as no rewiring and is less damaging to the original pcb - theirs not a lot of info on, especially as the 64Mb (4 x 16) TSOP48 chips being used are max 3.6v so suspect level shifting going on but can’t really see any on the piccy. Now the original SD3 Rom was 32Mb in size, this new official translation is a whopping 48Mb & there have been a few people who have successfully translated their own carts with either 2 TSOP chips or 1!! I’ve been doing a lot of digging lately & ive come across an official Trials of mana ROM that’s been successfully dumped from the Nintendo Switch Mana collection which includes ‘seiken densetsu 3’ official English translation!!!
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