The :reset-async BASIC program resets the current port or all ports to default values.
For Windows: Not Supported
If the port number is omitted, all ports are reset. The default values are: converse, tandem, and mirror, all off, yet enabled for use.
:reset-async {port.number}
Resets all ports to default values.
:reset-async
Resets port 5 to its default values.
:reset-async 5