[NTLK] Einstein Serial Ports

[Eckhart Köppen]

I've been getting my hands dirty again with Newton related stuff 
(different story), and wanted to tie up some loose ends regarding the 
Einstein serial ports. A bit of background, I implemented the REx based 
drivers a while back to learn more about how the ROM extensions work, 
and to have a playground to add custom features maybe not ready for 
mainstream usage yet.

I think the approach with those drivers would actually work even as a 
default driver, so I created 
https://github.com/pguyot/Einstein/issues/214 to kick off the 
discussion. I hope that Newtontalk is the best way to get feedback on 
this, keep the comments coming :)

Eckhart