ZeroAX wrote:Interesting post. Where do you think I can order one from? And will it be impossible for a noob or just way hard?
Both Mouser and DigiKey (two really great places to order from) carry RAMTRON products.
http://www.mouser.com/Semiconductors/Me ... on&FS=True
http://search.digikey.com/us/en/cat/int ... ?k=ramtron
Off the top of my head, I don't know what size RAM Sonic 3 uses, so you'll have to further narrow down those searches. You can probably safely go over the amount need (to a certain extent). 64Kbit would be a good guess...
http://www.mouser.com/ProductDetail/Ram ... 78izSsw%3d
Datasheet: http://www.ramtron.com/files/datasheets/FM16W08_ds.pdf
38 years of data retention and 100 trillion read/writes... yup
$5? Hmm, I thought it would have been more than that. The only catch is that it's a 28-pin SOIC (surface mounted) chip. What's on the Sonic 3 cart is a DIP (through hole) chip. That's not exactly a problem though. You can get SOIC-DIP adapters for pretty cheap on eBay. Like, about 5 adapter boards for $5 or less. Super cheap. IIRC, the RAMTRON chip on the Sonic 3 cart is 28-pin. So assuming the size is enough (and I think it is) the replacement would cost you maybe $10. I would have to look up the info though, I don't have this fresh in my memory right now.
The thread I talked about, that guy found a RAMTRON DIP chip that he used. But that might have been a few years back, DIP components are being phased out. Surface mounted ICs are always gonna be cheaper anyway. Even with the cost of an adapter board. But if you weren't dead set of using RAMTRON specifically, there's probably other NV RAM chips you can use that you can find in the through hole package (so you wouldn't need the adapter board).
As far as how hard it is... If you're an absolute newb to soldering, I would suggest practicing a bit and watching some videos before you attempt it. It's not exactly a hard skill to learn, but you have to learn it. You can't expect to do a good job on your first try. Also, through hole soldering is usually a LOT easier than surface mounted soldering, so it will take a little more practice if that's the route you go.
If you really wanna attempt this, I'll look up the nessecary info and try to find that thread I was talking about. I'll also give you some good soldering videos for you to watch and explain a good (and cheap) way to practice soldering.
PS, I kinda lost my train of thought halfway through this post, so hopefully it makes sense.