Which ones, the 111x,12xx,17xx etc series only have a few high-current pins and then only to maybe ~20mA and IIRC not 5v tolerant.I haven't looked at other series though.
Good choice of words there, you may be aware of these folks:
What's the interface to the daughterboards?
throwback to the S100 bus? :-)
Don't give up hope too soon!
What I don't like about the Unix-based ones (Rpi, BeagleBone) is that latencies/jitter actually becomes worse because of the general-purpose OS.
I've used the LPC2106 and LPC2148.
Since Due doesn't seem to arrive soon
Do you have any idea yet about the likely price range? Over $100 or under?
possibly supplementing that with Arduino shield compatible sockets for backward compatibility.