For those that are interested, I revised Joshua Thompson's Super Serial Card build. I revised it to be 2 layer rather than 4 layer, and to use a 1.8432 MHz crystal and Pierce oscillator rather than a self-contained oscillator.
The project is a fork of the original project at:
and the original is at
good job!!! thank you.
Here is a simpler 2-layer board version...
I don't think this is done right, I opened it and there are four layers there. I deleted the inner two layers that shouldn't have been there and it did not pass design rule check.