I've started to search some values on Shenmue I (PAL) saves, here's also the stuff I used to find this:
http://www.mediafire.com/download.php?1an8vgbdzbk9q8aPositions found:
0x689 - Byte that forces the game to run in a specific video mode: 0x50 (P) PAL 50Hz, 0x58 (X) PAL 60Hz (Allows to pick 50 or 60 when starting the game with this save), 0x56 (V) VGA Mode.
Ryo's money:
0x2018: Save 1 (Two bytes, or maybe four); 0x3818: Save 2; 0x5018: Save 3. (Didn't saved a Resume File)
Loading/Saving screen dates:
0x740: Save 1 (16 bytes); 0x780: Save 2; 0x7C0: Save 3.
For each eight bytes, the first two mark a year, the third one the month, the fourth one the day, fifth' the hour, sixth's the minute, seventh's the second (That's not seen ingame). Last one's always zero.
Game date (Alternate value):
Save 1's at 0x223D (It starts at 01 and counts forward instead of showing a full day/month/year). There's a possible duplicate at 0x31EC, and 0x2B35.
The problem's what I mentioned at the other post, if I edit something inside a savegame, the game will refuse to load that specific save, if the rest of 'em are untouched or you only touch the Video mode byte, they will go perfectly.