I'm a big fan of his videos, and he's a really great educator. But he didn't wrote those emulators (and never claimed to) - he ported existing ones.
I don't say that to reduce his contributions (hell, I did my share bit of porting code to more exotic platforms, and a proper port is tons of work), but to give credits to original authors who did most of heavy lifting of writing actual emulators.
I don't say that to reduce his contributions (hell, I did my share bit of porting code to more exotic platforms, and a proper port is tons of work), but to give credits to original authors who did most of heavy lifting of writing actual emulators.