Not sure I ever dropped a link to this, but it's a cool look not only at a project but also at the various approaches they took on the way to the one they decided best satisfied their needs and wants.
The problem they wanted to solve: how to get a Z80 compy on a tcp/ip network.
Their eventual solution was a custom Z80-PIO-connected tcp/ip offload board.
This page goes into lots more detail about the hardware solution: http://susowa.homeftp.net/index.php/kcnet-75/hardware-160.html
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