[Glemotooo]

I'm only aware of drivers, which were not sandboxed due to the nature of drivers (at least in late 90ties there was pobably not much of abstraction on that level, kernel features, hardware features available?)

[kqr]

There was -- Minix was developed in the 90s and ran drivers in user space. But it was (perceived to be?) slow, so mainstream OSes did not do it.