SEGA published all the software for the pre-MegaDrive era in Japan.
For MegaDrive and next systems SEGA attributed a prefix code to each publisher for their games serial. This code start by T- and is followed by two or three digits.
After that there is the game unique identifier, which is two digits then the console code (digit or letter).
For the 101 I’ve took the easiest part. It’s the easiest because SEGA published all their game serial (see http://sega.jp/archive/segahard/) and all games follows “almost” strict rules.
Game cartridges serial is G-10XX. G means Game and XX is the software unique identifier.
Card game serial is C- XX. C means Cart and XX is the software unique identifier
Educational cartridges serial is E-1XX. E means Educational and XX is the software unique identifier (the only two software that don’t have serials are 物理(運動と力編) and 物理(エネルギー編)
Basic cartridge serial is B-XX. B means Basic and XX is the software unique identifier.