I don't recall many people clamoring to build
Apple ][ ethernet
networks back in the 80s. Maybe Corvus networks, but networks of
Apple ][s in general just weren't the norm (I never saw any).
"Symbiotic Computer Systems" here in the UK produced network cards for the
Apple ][ & //e's, fibre optic based things.
I installed several systems in various businesses in the Midlands here, they
also did hard drive (SymbFile) and tape storage systems, all around the 1982-
1984 era. Wish I knew where the things had all gone to now...
greg