SFC cartridges and low-profile EEPROM
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commodorejohn
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SFC cartridges and low-profile EEPROM
Just wondering: I've seen pictures of Super Famicom cartridges that have had the mask ROMs removed and replaced with a sort of converter board that allows a surface-mount EEPROM (TSOP package, I think?) to be plugged into a DIP socket. I have a couple SFC cartridges that I'd like to convert to use patched English ROMs (Final Fantasy V and Seiken Densetsu 3, respectively,) but I'd like to avoid the ugly "cut out a hole in the casing" approach with the "stacked DIP ROMs" method I've seen for SFC cartridge conversion. Are these TSOP->DIP adapters available commercially? Where could I obtain them? (Also, what do I do for cartridges of odd ROM size like FF5?)
[size=0]"There is only one basic human right, the right to do as you damn well please. And with it comes the only basic human duty, the duty to take the consequences."
- P.J. O'Rourke[/size]
- P.J. O'Rourke[/size]
Re: SFC cartridges and low-profile EEPROM
yes,commodorejohn wrote:Are these TSOP->DIP adapters available commercially?
Ask google (your phrase "TSOP DIP adapter" works for me)Where could I obtain them?
Uhhhhhhh. You could try some things, but I don't know what's right. Padding it with zeroes or $FFs is the first most trivial thing I'd try before I sweated trying anything more complex. Assuming you can reprogram the ICs without too much work.(Also, what do I do for cartridges of odd ROM size like FF5?)
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commodorejohn
- Posts: 193
- Joined: Mon Sep 11, 2006 6:48 pm
- Location: Moose Lake, Minnesota
Yeah, I guess that was a silly question. What I meant to ask was, are they available with an EEPROM already on them? I don't have any surface-mount equipment with which to attach one, so if they're not I'd have to find someone who could do it for me. If I did, what EEPROMs would be appropriate, as far as matching the pinout on SNES mask ROMs?
There aren't going to be adapter boards with flash already soldered on.
Now's the time to learn, I guess. It isn't even that hard-- put a smaller tip in your iron, put down a ton of solder flux, tape the chip down, go over it again with flux, clean your soldering iron tip, put a big droplet of solder on it, drag it across the pins, feed more solder as you're going across if it runs out.
It will "magically" work for the most part, but use solder braid to get rid of the three or so bridges between pins that do develop.
No pinouts match the mask chips perfectly, hence the need for an adapter board.
Anything that is 5 volts with enough address lines and an 8-bit data bus will work.
Now's the time to learn, I guess. It isn't even that hard-- put a smaller tip in your iron, put down a ton of solder flux, tape the chip down, go over it again with flux, clean your soldering iron tip, put a big droplet of solder on it, drag it across the pins, feed more solder as you're going across if it runs out.
It will "magically" work for the most part, but use solder braid to get rid of the three or so bridges between pins that do develop.
No pinouts match the mask chips perfectly, hence the need for an adapter board.
Anything that is 5 volts with enough address lines and an 8-bit data bus will work.
No offence/rudeness intended, but it would really help the guy if he was linked a proper, 100% accurate pinout mapping from mask ROM to EEPROM or Flash. This kind of response mimics what I've gotten from the nesdev community over the years when asking how to re-wire an MMC3 cart to permit EEPROMs (the response of which always is "it's not that hard, you just map pin X to pin Y based on the function of the pin", which though true is far from what all is required, pin-mapping-wise).whicker wrote:No pinouts match the mask chips perfectly, hence the need for an adapter board.
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commodorejohn
- Posts: 193
- Joined: Mon Sep 11, 2006 6:48 pm
- Location: Moose Lake, Minnesota
I can look at the pinouts and figure it out, probably, but it would help if someone had some more detailed information.
[size=0]"There is only one basic human right, the right to do as you damn well please. And with it comes the only basic human duty, the duty to take the consequences."
- P.J. O'Rourke[/size]
- P.J. O'Rourke[/size]
I haven't really been studying the SNES as much as the NES — all I can point you at is http://wiki.superfamicom.org/snes/show/ ... 26+Pinouts but I can't find any 5V 4MBx8 EEPROMs on digikey. SST sells some 512kx8 EEPROMs (SST39SF040) and you could stack 5 of them (augh) and Atmel sells (sold?) a 1Mx8 (AT49F8192A or AT49F008A) )that you could stack 3 deep.commodorejohn wrote:I can look at the pinouts and figure it out, probably, but it would help if someone had some more detailed information.
(P.S. why the megazeux avatar?)
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commodorejohn
- Posts: 193
- Joined: Mon Sep 11, 2006 6:48 pm
- Location: Moose Lake, Minnesota
Yeah, that's kind of the thing. I'd really like to avoid stacking EEPROMs, since that'd require me to cut a big ugly hole in the case, but I'm not sure how feasible that is. Guess I'll see...lidnariq wrote:I haven't really been studying the SNES as much as the NES — all I can point you at is http://wiki.superfamicom.org/snes/show/ ... 26+Pinouts but I can't find any 5V 4MBx8 EEPROMs on digikey. SST sells some 512kx8 EEPROMs (SST39SF040) and you could stack 5 of them (augh) and Atmel sells (sold?) a 1Mx8 (AT49F8192A or AT49F008A) )that you could stack 3 deep.
(P.S. why the megazeux avatar?)
(Also the avatar is because I was making a NES conversion of one of Kurushimi's joke games at one point, for no particular reason. Haven't actually done anything on it in quite a while though.)
[size=0]"There is only one basic human right, the right to do as you damn well please. And with it comes the only basic human duty, the duty to take the consequences."
- P.J. O'Rourke[/size]
- P.J. O'Rourke[/size]
According to the SST datasheet, the TSOP EEPROM is 1mm thick, and using my calipers here, this random DIP 8kBx8 EEPROM is 4mm thick. It might work out...commodorejohn wrote:Yeah, that's kind of the thing. I'd really like to avoid stacking EEPROMs, since that'd require me to cut a big ugly hole in the case, but I'm not sure how feasible that is. Guess I'll see...
commodorejohn:
Just pointing out this thread if you haven't already seen it...
There is actual PCB artwork, plus someone was willing to have these made at the time.
http://nesdev.com/bbs/viewtopic.php?t=6047
Just pointing out this thread if you haven't already seen it...
There is actual PCB artwork, plus someone was willing to have these made at the time.
http://nesdev.com/bbs/viewtopic.php?t=6047