According to
this talk from 29c3, at the very least the modern Tamagotchis use a 6502 SoC... makes me wonder if Bandai moved Famicom programmers over as the FC reached EoL.
The chip is revealed around 12:30 to be a Generalplus part, where Generalplus has something to do with Sunplus. The ca65 Users Guide repeatedly mentions mysterious proprietary extensions to the 6502 architecture in Sunplus parts.
Wow! A female hacker! I had no idea they existed.
Sarcasm aside, I really am impressed by this, she is really hardcore if she's getting chips decapped. I don't hear about woman hackers very often.