Looking for a detailed NE2000 datasheet

[techie]

I am using realtek RTL8109AS to tryout a TCP/IP board with 8051. The problem is that I cant get any reasonable description of RTL8019AS or its original NE2000 chip. The realtek website gives a datasheet but it looks like they have asumed that the reader already has basic information of NE2000. There is no block diagram of chip, packet structure, memory usage etc etc. Can someone point to a more detailed source of info

 

[dainis]

ne2000 pdf

NE2000 reference chip is DP8390D
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[techie]

ne2000.pdf

Thanks dainis. Since I am new the the ethernet world, I was wondering why is that the phrase NE2000 is so frequently used but still there is no data avaialable for this "chip". Is it obsolete. If it was made by National, then howcome their website disowns it.