I think I can forget about seeing the Tibbo firmware anytime soon so here is what I think is the final layout for the ConnectOne ethernet shield. The TX, RX connections are dictated by the PICAXE and Xino. I still need to check this with the Xino designer but I think it's ready to have CircuitMart make some prototype PCBs.

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When the Tibbo firmware is released I hope someone will consult a medium and let me know.

I'm going to spend my time finalizing the design of yet another Arduino clone. This will use a ZBasic ZX328n but it will be socketed so it can be replaced with a AVR Mega328P.

When my Xino kit arrives I'll see whether it is practical to modify to use the comparators as inverters for TX, RX. That should work with 16F88, 16F886/887 and 18P25K20/22, lowering the chip count.