To clarify vt240's reply: If you were playing with coax, that would have been 10base-2. 10base-T is twisted pair Cat3 cable that used the same 8P8C connectors we use today.
Sorry. Just to mention it is going to give me nightmares about big AUI media converters sticking out, loose, not fitting right, falling off, ahahhaa. Novell Netware. Tree. Booting from floppy disks. ISA Cards!