No it wasn’t just win95 but also IBM DOS and BIOS.
Keyboard not found, press F2 to continue asks the users to either plug in a keyboard and the press F2 on that one to continue or press F2 on an unrecognised keyboard so that the OS could pick it up.
It would then reload the driver’s for the PS/2 keyboard and continue as normal.
Git gut by using a sane POSIX architecture just like any other OS out there.