it won't be shown as an amiga board since only the x86 part of your bridgeboard is in contact with the ISA bus.
BTW, if you have 8MB installed on ZorroII you'll need to remove a pair of megabytes so bridgeboard works: ZorroII bus only has a space of 8MB and if you fill it with ram then there's no space for bridgeboard's 512KB of ram.
Search on aminet "etherbridge" and you'll find amiga SANA2 drivers. You'll also need to configure PC side properly using janus software. You'll also need to load 3com drivers in the MSDOS side and since it uses a 8088 you'll also need to configure your 3com to work in 8bit ISA mode.
