FWIW, here is what is inside the broadband adapter.

On bus connector side:
SEGA		(presumably the shb<->pci bridge?)
315-6310
0041KK001

Component side:
RTL8139C	(this has an internal MII right?)
08551Q1
037B TAIWAN

Pulse
H0011
0044-J
CHINA

L46R		(looks like a serial eprom to me)
046W

-Andrew