Wow.... The last time I visited this thread, (mid December)nobody seemed interested in making the JuiceBox do more than it does out of the box. I just thought I would check back to see if anyone had posted anything new, and BAM!!!!, a whole new discussion area has been created. After already being pleased with the JuiceBox & MP3 kit that I paid $54 for before Xmas, (my 4 yr old son doesn't put it down often) when I saw that you guys were picking them up for around 10 bucks each I had to check Walmart myself. Came away with a solid green one (ie, not silver on the back) for $13. Sweet.
Following shiett3's info, here are the specs of mine:
Board Rev / Production Test Version / Rom Checksum / Serial / Amount SRAM / MP3 Version / MP3 firmware / MP3 Build / SRAM Chip / Rom Chip / Color /
PVP-01 REV: 01A / Ver 2.6 / 26584D16 / 2514 EA / 2Mb / 1.0.5 / 2.0.8 / 040812232933 / StarRam 1MX16T2 / Epoxy Blob / Red-Silver (LED)
VID-01 REV: 05B2 / Ver 2.6 / 26584D02 / 2454 EA / 8Mb / 1.0.5 / 2.0.8 / 040812232933 / Spectek S16004LK6TW / OKI R27V6402G / Lime Green-Lime Green
Mattel must have a bunch of greasy fingered assemblers putting these things together in the factory. Both of mine had MANY distinctive fingerprints inside the units, mostly on the copper shield on back of the main board. Maybe they ate KFC for lunch or something.
Anyway, I've played around with the Videosoft codecs, and got nothing regardless of how I encoded the sample videos tested. All attempts were made using 240x160 res @ 5-10fps, most with the H.264 codec. I'm pretty sure there must be some sort of loader or extra file structure on the Juiceware chips, for the fact that every one I've seen has a menu.
Both units will play MP3s on FAT16 formatted SD cards as long as they're 128kbps. Also tried just about every other similar audio codecs out there, of which none showed up or played.
Something that struck my interest a few weeks ago was when I read that Matrix Semiconductor also creates the memory used in the Nintendo DS and the Mattel Megaman PET.
I've stalked this BBS for awhile, getting info for hacking several other devices, and am glad to see that everyone has picked up this one to toy with. Especially since Mattel killed it so quickly.