I've been lurking on this site for a few weeks, and with the information I've seen, I've discovered that my portable music/video player is actually a typical MP4 player.
My player is a "The Sharper Image" brand 1GB digital audio player, which plays MP3 and WMA audio files, and AMV video files. (I haven't tried WMA or AMV files myself yet, though.) I didn't see it anywhere on this site or other sites about MP4 players, so I decided to dissect mine to get more information about it.
My player has a board marking of "MU620AFC-MAIN-V05 070407" (that last number seems to be a date of either July 4, 2007 or 07 April 2007), the CPU is an "ACU7513", and the Flash is a "Toshiba TC58NVG3D4CTG00". The firmware version is "Core: 7513 9.1.51-1". I didn't see any board like that on this site or others either.
Like I mentioned in the title, my player is still fully functional (and I hope it stays that way). I was thinking of backing up my firmware (in case I somehow botch mine up, as well as to help people who may have the same or similar player that's dead), but from what I read, I won't be able to extract my v9 firmware using s1fwx.
So I'm wondering, what could I do to contribute to the community? I don't know what I can do about extracting the firmware (and maybe someone can help me out with that), but I suppose I could at least take pictures of the inside and outside of my player.