[Coco] Serial to Ethernet

[Chris Ahrendt]

I actually have a better idea that I floated back about 8 months ago...

Just need the following:

Cart interface.... which I think was being sold on ebay... or even make 
a Y adapter so you can plug in the disk adapter.  the other side plugs 
into an arduino (Yun or regular with either a wired ethernet or the 
wireless adapter.)

Then the following sketch:

#include <SPI.h>
#include <Ethernet.h>

// The network port on which to listen for incoming connections.
int network_port = 5331;

// The baud rate to use for serial communication.  This needs to match the
// speed used by the microcontroller (e.g. the value passed to
// Serial.begin() in an Arduino sketch).
// The communication protocol shall follow the RS-232 standard of 8-N-1
// (1 start bit, 8 data bits, and 1 stop bit).
// By default the Arduino uses 8n1 so we dont have to set anything but 
the baud rate
// For the Color Computer 2, the supported clock
// speed shall is .89MHz and the bit rate is 57,600 bits per second. For the
// Tandy Color Computer 3, the supported clock speed is 1.78MHz and the bit
// rate is 115,200 bits per second
// int serial_baud_rate = 115,200; for the coco 3
int serial_baud_rate = 57600;

byte OP_INIT = 0x49;
byte OP_TERM = 0x54;
byte OP_RESET1 = 0xFE;
byte OP_RESET2 = 0xFF;
byte OP_NOP = 0x00;

// Whether or not to print data coming from the serial port in Processing.
boolean print_in_processing = true;

// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network:
byte mac[] = {
   0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };

IPAddress svr1(1,1,1,1);

EthernetClient client;

void setup()
{
   // start the Ethernet connection:
   Ethernet.begin(mac);

   Serial.begin(serial_baud_rate);
   while (!Serial) {
     ; // wait for serial port to connect
   }
   establishContact();  // send a byte to establish contact until 
receiver responds
   client.connect(svr1, network_port);
}

void loop()
{

   // as long as there are bytes in the serial queue,
   // read them and send them out the socket if it's open:
   while (Serial.available() > 0) {
     char inChar = Serial.read();
     if (client.connected()) {
       client.print(inChar);
     }
   }

   // if there are incoming bytes available
   // from the server, read them and print them:
   if (client.available()) {
     char c = client.read();
     Serial.print(c);
   }

   // if the server's disconnected, stop the client:
   if (!client.connected()) {
     Serial.println((char)OP_TERM);
   }
}

void establishContact() {
   while (Serial.available() <= 0) {
     Serial.print((char)OP_NOP);   // send a OP_NOP
     delay(300);
   }
}

  to run on the arduino....

Then the hbdos driver would need to be modified to write to the bus 
instead of the serial port....

Chris