3Com Etherlink III is one of the most popular network cards for retro PCs.

It has a lot of versions and almost all of them work very well.

Some cards have a place for a ROM chip that can be used, for example, to load an XT-IDE BIOS (tested).

See also:
  * [[https://en.wikipedia.org/wiki/3Com_3c509|3Com 3c509 on Wikipedia]]
  * [[https://retrocmp.de/transfer/3c509b.htm|3C509 tools on RetroCmp.de]]

I use one of these network cards on the Toshiba [[toshiba_t3200sxc|T3200SXC]] 386-class portable computer.

{{::etherlink_with_eprom.jpg?400|}}

Etherlink III card with EPROM inserted.