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Well, here's my experiment steps for configuration possibilities.
1. Activate the option.
2. Save configuration.
3. Observe win32.serial_port=TCP://0.0.0.0:1234 in file and change 1234 to 1235.
4. Reopen winuae.
5. Load configuration.
6. Switch to IO ports (observe 1234 is displayed in fixed list).
7. Save configuration.
8. Observe 1235 is still in configuration file and has not been overwritten.
So, in theory I would expect you can configure two WinUAE instances to open different ports for serial ports. This could be tested with netstat or whatever, given the two active running emulators. Verify it works for the first with the default port. Change the second and verify that is also running with the second port.
At that point the real investment is writing the communication code if this is the best path to pursue?
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