AVR-Chat

Dave,

> Can you do clocked serial on a couple of pins, maybe in a ring, or share
clock and separate data lines?

I could, though There will be other stuff going on, so I'd rather not have
to depend on bit banging.

> Does everyone need to talk to everyone, or master to two slaves, or ?

two fo the four ports come from outside, for these I planned to use the
built in USARTs.
The other two are slaves from the master, so I could use my own 'serial'
ports by bit banging, but I'd rather avoid the over head if possible.
Ideally I'd love a dual UART chip with buffer :-)

Paul