First things first: I have two computers on my home network (i.e. all behind a single router, all capable of sharing files), I tried searching for stuff like "Dosbox Modem" and "Dosbox Multiplayer" but without anything current. I've been trying the methods shown on this Vogons thread from 2004(!):
http://www.vogons.org/viewtopic.php?t=4328
...but without any success. No matter what I try in NFS1, it always gives me "Failed to init modem" or something like that, implying that my problem isn't with the nonexistent numbers I'm giving it, but instead that the modem setup I have isn't working.
Under dosbox.conf, I've changed the serial1 setting:
...and in NFS, I've changed the dial command to ATDT, the init command to ATS0=1, and I've tried using assorted Hayes models (since the Vogons thread mentioned something about Dosbox emulating Hayes modems in particular). So far, no success. Any ideas?