Wow, you are stretching the memory here, but I'm pretty sure I found the old Nintendo soundset as SF2 and also for Roland S series samplers.
The sounds were indeed 8 bit and the sampler versions were 12 bit , so you may need to do some work converting formats if you find these. Vienna and/or S-Sampler come to mind as being tools I used back in the day.

I started looking for them locally, then realized they were likely on floppy disks .. so long gone here.
Shouldn't be hard to actually 'sample' them if you know the desired sound and have something that could trigger them.

I'm pretty sure I can play the old Zelda games still and get the samples .. but if you are talking Pong, well that's another story. You mentioned 70/80 era .. in 1970's things were pretty dang limited and proprietary from my memory. I'd guess you would need a way to trigger these.
Or maybe a retro-game could suffice in this aspect. (?)

I do not work here, but the benefits are still awesome
Make your sound your own!