On 12/8/06, Ken Seefried <ken at seefried.com> wrote:
  From: "Ethan Dicks" <ethan.dicks at
gmail.com>
  Strictly speaking, DOS is not limiting your
signalling speed,
 but the ISA bus could be. 
 For 100Mbps ethernet, yes.  You can only push a fraction of the bandwidth. 
Indeed.
   There was one,
only one, 100Mbps ISA card I ever
 ran across (by 3Com, but I can't remember the model number) 
 3c515 
 
That's the one I remember looking at.  Never seen one up close, but I
do have the 3Com tech docs at home.
  Might not be the only one, though.  According to Dan
Kegals Fast Ethernet
 page (
http://alumnus.caltech.edu/~dank/fe/) there's a rumor that Cogent and
 Olicom had ISA 100TX cards.  I've never seen or heard of one in the wild. 
Hmm... interesting.  New ones on me.
  I've also seen someone put a 100Mbps PCMCIA card
in an ISA-PCMCIA bridge,
 but that's stretching the definition a bit. 
*slaps forehead* - I'd forgotten about that solution.  I have a PS2/e
(IBM's "green" 486SLC box w/1 ISA slot) with the quad PCMCIA ISA card
(two PCMCIA slots out the front, two out the back).  Mine is presently
loaded with RedHat 5.3 (it works w/16MB of RAM) and four network cards
for use as a software development "faux Cisco PIX" (multiple DMZs, but
not enforced security levels).  At least two of the four NICs are
Xircom 10/100 cards.  I think all of the 3Com 10/100 NICs are Cardbus,
but there are a few Linux-supported 10/100 16bit PCMCIA NICs (though
I'm not as certain about DOS and cardbus services, etc).
I've picked up single-slot PCMCIA ISA boards for around $25 at Dayton.
 Dunno how easy they'd be to find now.
-ethan