>I think if there was another "bridge" mac it would've been easier (setup LocalTalk over the serial port
But serial communication doesn't require another Mac to receive the data since it's just raw HEX/ASCII bytes over the standard serial protocol. You can pick up the data with an Arduino.
Nor does serial mandate any handshake or a master-slave sync to work. You're free to shoot those bytes on the empty wire for all it cares. If someone picks them up good, if not, just as good.
But serial communication doesn't require another Mac to receive the data since it's just raw HEX/ASCII bytes over the standard serial protocol. You can pick up the data with an Arduino.
Nor does serial mandate any handshake or a master-slave sync to work. You're free to shoot those bytes on the empty wire for all it cares. If someone picks them up good, if not, just as good.