According to this page, the game needs to be specifically programmed to write the string "SEGA" to a specific memory address. On an older Genesis that doesn't have TMSS, this will cause a crash unless the code specifically checks the hardware revision first. So, what about cartridges that were made before TMSS was invented? Clearly they wouldn't be programmed to check if they're running on a console that hadn't been invented yet, and perform a specific step necessary to make it compatible with a behavior of said system that also hadn't been invented yet. So if you attempt to use a pre-TMSS cartridge, for an officially-licensed game, on a TMSS Genesis, it wouldn't find the string there, right? How does it know the game is in fact licensed if it doesn't write the string?