For the first 2 games on the Saturn, I see dark.
For Chocobo’s Mysterious Dungeon depends on witch one you are talking about and eventually what version of it.
-Chocobo no Fushigi na Dungeon: Chokobo no Fushigi na Danjon (チョコボの不思議なダンジョン?, lit. "Chocobo's Mysterious Dungeon"):

Was for the PSX, ported to the Wonderswan and should be available on the USA Playstation Network.
There is a small light for the original PSX just because of me (scroll down a bit) :p
http://membres.multimania.fr/auryntoo/-Cid to Chocobo no Fushigi na Dungeon Toki Wasure no Meikyū DS+
Sido to Chokobo no Fushigi na Danjon Toki Wasure no Meikyū DS+ (シドとチョコボの不思議なダンジョン 時忘れの迷宮 DS+?, lit. "Cid and Chocobo's Mysterious Dungeon: the Labyrinth of Forgotten Time DS+")

You are lucky for this one too, there is a partial translation and maybe because I showed him some easy things he could do with the rom , maybe he is still continuing it:
http://gbatemp.net/t231032-cid-to-chocobo-no-fushigi-na-dungeon-twnmds-translation-I hope you are not refering to Chokobo no Fushigi na Danjon: Toki Wasure no Meikyū (チョコボの不思議なダンジョン 時忘れの迷宮?, lit. "Chocobo's Mysterious Dungeon: The Labyrinth of Forgotten Time") for the Wii that have an official USA version released:

If not any of the above, take a look at the wiki (
http://en.wikipedia.org/wiki/Chocobo) to find the version you are talking about.
October 13, 2011, 11:57:40 PM - (Auto Merged - Double Posts are not allowed before 7 days.)
I am actually wondering because I always was thinking that the saturn was a loved console especially because of the many japan only game that this console got but apparently the saturn isn't so loved as I was thinking.
Anyway I just took a look at "The Blank Of Three Years" and I don't want to say it's simple to hack but it doesn't seem so hard as well.
The first thing I found are the words "Opening Movie" followed by a file list with extension .bmp:

The name on the file list are actually single files with the extension .PAC:

From the filename extension inside the file and the BM6 (possible magic word), I think they are some variation of bitmap but the extension .pac tells me that they are probably compressed.
Some other .pac files seems to be a palette+multi image (example the face files) that probably have each frame on that face expression inside with the own palette (palette probably .bcl and the frames .bcg):

The format it's very straight forward:
14 bytes > file name
2 bytes > unknow (maybe the number of palette or color depth)
4 bytes > absolute offset
4 bytes > file size
4 bytes > null
4 bytes > unknow (maybe width of the image??)
What is sure is that there are some graphics that can be viewed with GBA 8bpp like this "exit" word that should be in the option screen:

Some with 8 colors 3bpp (yes, I have notated the errors) like this that should be the ending big font:

Some with 4 colors 2bpp (yes, i have notated the errors again) like the normal font in the game:

When I found this file with the words "player" and the names, I started to hope that the game really shouldn't be so complicated:

and in fact soon after that, I found the text in plain uncompressed SJIS encoding and the whole pointer table just in front of it:

and another file with the text:

Sure those 0E and 17 between the pointers are still to be checked and there seem to be some "control codes" mixed with the text too.
So, the file in the game should be as follow:
.ACX > Voice samples
.ADX > BGM
.BMS > TEXT
.CAK > MOVIE
.EXA > Unknow (sound program??) only 1 file
.FNT > FONTS
.MAP > Unknow (audio mapping??) only 1 file
.PAC > Compressed file or archive (normally graphics)
.SCR > Probably graphics again
.SEQ > Animation data???
.TXT > Always present on Sat CD
.BIN > Uncompressed graphics or system files.
To conclude this post:
- I don't have any intention to make this translation, what I did, was just because I am curious.
- I believe the saturn isn't so hard to hack after all and I think that it's sad that it's so left by side from the translation scene especially because of the good/special games this console has.
Sure like Nightcrawler said, there is a lack of tools but there are so many programmers out there that if somebody really put some work on discover the "standards" of this console, it would sure catch up with other systems very quickly.