I have a couple of TCP/IP stacks written for the 8051... need your email to send them to you as they are rather large for a post here... Also would need to know what ethernet chipset you are using...
I have been trying to get similar info on x10 to implement xmit and rcv of x10 with the 8051 but I just got ignored... any ideas that would help?
I realy don't want to use a comercial interface but rather build my own... like you... just because I want to... and it will save me money as I have an unGodly mountain of parts to play with...

I guess people like you and I are the only TRUE hobby engineers and hardware hackers left...