You can only change the programming port from the current porgramming port or through WINSPM. If you have winspm, use the following prompts: System Prog, start, system, prog port, then backspace out the current extension and add the new extension + Enter.
If you do not have winspm, it becomes a little harder. I believe the programming port can only be one of the first 5 ports on the first card. (0101, 0102, 0103, 0104, or 0105). You could try plugging into each of those ports to see if they get the System prompt and then change it to the operator extension with the instructs above.
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