SOLVED. Science Fiction - Short story by Isaac Asimov? Scene is a campfire where a small group of people (3?) have a conversation. The setting changes through history without them noticing it, because the relationships stay unaltered. Read around 1990. [s]

[Malik]

The scene is a campfire where a small group of people (3?) have a campfire conversation. But the plot is that the setting changes through history without them noticing it, because the relationships stay unaltered. I remember that at one point one of them is a shaman and the fire burns wood and branches, but then it changes into (?) a small nuclear campfire unit and he becomes an IT engineer or something like that...

[Andy]

Thus We Frustrate Charlemagne by R. A. Lafferty

See this description

https://sfshortstories.com/?p=1151

[SBC]

Thus We Frustrate Charlemagne for the Goodreads link.

[Malik]

Thank you Andy, that is the story I was looking for. Funny how some details stick while other major components of the plot went completely lost...
Thank You to the Goodreads commmunity and all who bothered to read my request!

[SBC]

I'm glad you found it, Malik. Looking forward to reading it myself!

[Andy]

Glad to help!