That kinda sounds like animal abuse.

Not literally a tamagachi, but if you want to go down the super niche rabbit hole that'll include interfacing a TV and keyboard to a 6502 processor, there's a guy named Ben Eater who does a great job covering that stuff. eater.net or search his name on YouTube.

No. The 6502 itself is probably the simplest CPU to be used at scale in home computers: it has only 3 registers, a handful of instructions (you don’t even get multiplication) and is made of around 3,500 transistors (less than half the number in the Z80). All the things that gave the C64, Apple II, BBC Micro, NES and such their recognisable qualities were provided by support chips used alongside the 6502.

6502s were used in a lot of simple electronics after general-purpose computing moved on. They used them in battery-powered pocket chess computers in the late 80s, for example, and I wouldn’t be surprised if cycle computers or microwave ovens contained them as well.

Like is it capable of that sure, could you actually do that with a modern tamagotchi, probably not.

you'd have to graft on a lot of IO that doesn't exist but probably. good project to show off on hackaday.

That is some Matrix s..t right there