> A friend of mine requires an ethernet card for
> his 5400 Directors' Edition (the black one).
[quoted text clipped - 5 lines]
>
> Bill Dixon
"In developing the 5400, Apple scrapped the logic board architecture that
has been used in the Quadra 630, and Performa 5200, 6200 and 6300 models,
and replaced it with a new logic board based on the PCI architecture used in
higher-end Power Macs.The 5400 (now) includes one PCI slot...."
-MacWorld MacSecrets, 5th Ed. (1998)
the 5200 had a pds slot, whereas the 5400 now has pci. this is why your old
ethernet won't fit.
PCI ethernet is easy to find, fortunately.
one vendor to consider is asante (http://www.asante.com)
or whatever else your local apple dealer may recommend.