Hello

> What do i need to interface an Intel 386 to an Ethernet
> end (an Ethernet 8-pin Jack)? Is there a chip can do it
> for me?

I'm astonished reading questions like this... but wont' go
offtopic.

To start with, please have a look at
http://www.embeddedethernet.com
You'll find there interfacing ideas, schematics and code.

Good luck,
Enrique.