The gameboy connector is rhomboid along the long edge and with a longer bevel, making it much harder to insert incorrectly. It's usage is also a very special c

The gameboy connector is rhomboid along the long edge and with a longer bevel, making it much harder to insert incorrectly. It's usage is also a very special case -- the variance is in the cables, not the sockets. Only Nintendo had any reason to manufacture devices, and they always implemented it correctly with fascia preventing forced insertion.