The EPM70xx are also true 5V tolerant but I think Altera doesn't make them anymore. But Atmel still manufactures equivalent parts (ATF15xx).
These are EPM3256A 144-pin, so no 7000 or Atmel equivalent unfortunately.
Won't need? Dunno, if we can't dump them and don't want to erase them what are the remaining possibilities?
No because the 70xx are pin compatible with the MAX3000.
I'm happy to erase them, just not yet, as I need them working for the moment (for more testing). I would have liked some replacements just so I could keep the originals as is, then the cart can always be put back to stock by refitting the original chips if necessary. I've actually got 1 of the 3 from the dead 120-in-1 which might be ok, i'll try that first when the time comes. I might also order a few ebay junk ones and see what happens.
Well we won't need to replace the CPLD's will we? At that point you might as well make a new board from scratch.
And don't forget about the STC chip nobody's talked about yet
No we won't need replacement cplds, as above, would just be nice to have some spares. Although I guess we should make clear it won't be possible to put the cart back to stock.
As for the STC, yes that's the biggest unknown at the moment, not much info out there about them other than basic datasheet. Luckily it doesn't seem to do much other than save game softdips to its internal eeprom and play them back when the 68k code asks for them. Although that's tbc, i've got lots more investigation to do in that area...
I'm actually wondering if it could be replaced with a PIC or AVR, if there's something that would roughly fit the footpint without too much modding, might be worth considering...
Shame they didn't stick with the 120-in-1 design, that has a Atmega8 which would be a whole lot easier to work with