The AAUI connector is basically Apple's
miniaturized version of the 15-pin
DA-15 AUI connector which was originally used for 10Base-5 ethernet.
External transceivers such as the M0437 are pretty much the same
internally as a generic AUI to 10Base-2 or AUI to 10Base-T transceiver.
I beleive that while the AUI connecotr has a 12V power supply for the
external transceiver, the AAUI has a 5V supply. So converting a
transceiver from one to the other is more than just a connactor swap.
-tony