Path: utzoo!mnetor!uunet!husc6!think!ames!pasteur!ucbvax!proteon.COM!jas
From: jas@proteon.COM ("John A. Shriver")
Newsgroups: comp.protocols.tcp-ip.ibmpc
Subject: TCP/IP on Leading Edge Model D
Message-ID: <8804051512.AA03229@monk.proteon.com>
Date: 5 Apr 88 15:12:05 GMT
Sender: usenet@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 5

Yes.  Turn off the stupid clock calendar that's on the motherboard.
It's at I/O address 300, which conflicts with the default address of
most network interfaces.  I think you pull off jumper J13-2.

Alternatively, move the 3Com board to address 340.