Editing Basic externally

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Editing PicoMite files over USB serial terminal

I have managed to install windows USB serial drivers and have tried connecting via USB-C and micro USB using terraterm to no avail. I can see the USB serial port in device manager and terraterm seems to connect but the screen remains blank. I really need to be able to edit programs on my PC as the PicoCalc screen cuts the long lines off and the current workaround is too cumbersome. Am i missing something?