Dojo support for coco (bit banger)

[spotlessmind1975]

The Color Computer has a built in serial port. It is commonly referred to as the bit banger. It is located on the back of the computer and labeled serial. It has three lines and ground. TX, RX, and Ready. All of the signals are under the direct control of the CPU. There is no UART on this port. In MAME this port is called rs232.

 $ ./mame64 coco2b -rs232 null_modem -bitb socket.localhost:6809

This will cause MAME to try to connect to local host on port 6809. If it fails, MAME will opening a listening socket on 6809. Either way it is bi-directional. Of course ‘localhost’ can be substituted to any fully qualified domain name on the internet.

See: https://tlindner.macmess.org/?page_id=659