Lately, I’ve been trying to figure out how a Tamagotchi’s gender is determined. There appear to be two indicators.
The first is byte 10, which appears to be set to 4 for female gotchis and 3 for male gotchis, but this doesn’t appear to influence the gender that the gotchi is recorded as under the friends menu.
After much fiddling, it turns out recorded gender is determined by bit 5 of the second byte of the UID (yes, really). If it is not set, the gotchi is male. If it is set, the gotchi is female. Note that appearance is not related to gender (there are ‘girl’ and ‘guy’ appearances, but they each have their own identifier in the appearance section of the request, and the gender bit does not affect how they are displayed.)
An update protocol diagram is as follows:
The UID seems like a rather strange place to indicate the gotchi’s gender. There are a couple of possible explanations. Perhaps it is more efficient (a device does not have to store an extra gender marker alongside each friend’s UID). Or perhaps gender is so deeply linked to a Tamagotchi’s identity that it is inextricable from it’s UID. Or perhaps a Tamagotchi’s UID is more than just a random identifier, maybe it has a role in detemining its future growth (this is consistent with observations on other communities that Tamagotchi’s tend to follow a number of set growth patterns). Maybe there is predetermination among Tamagotchis.
Deep and complicated are the questions of Tamagotchi life…