Relatively easy. Write an extension that simulates MacTCP's interface and uses PPP over the Serial port. Then marvel at there being so little memory to do anything else.

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Hmm, if I read that right your suggesting making something that looks like MacTCP so that apps that are already coded for MacTCP will work with little (or no) modification? I guess that could work for more powerful Mac's than the original 128K - but not the 128K, just because I assume most of those apps would expect a whole lot more than that little box has to offer.

I imagined that a port of Contiki would be just that - wouldnt look like MacOS at all, would implement the uIP stack, and would require new apps be coded specifically for it.

Lack of a PPP implementation would be a bit of a bummer tho...