Does anybody know what networking interface the 8051 use? My initial assumption would be Berkeley Sockets, but I want to be as sure as possible, and I couldn't find anything on the wiki or in previous posts.
On what do you base that assumption?
You will find a complete description of the 8051 architecture in general in the so-called "bible" for the 8051 - links here: www.8052.com/.../120112
For specific details of a particular chip, you must refer to the manufacturer's Datasheet and any other supporting documentation.