Hi Patrick,
I had never seen that one before, they must have added Mode-8 to the other serial ports and I didn't notice.
I usually use the RRC with a K3, so COM1 is blocked for CAT, therefore I never noticed that this was changed.
So maybe you are right and you can run COMEXTRA/COM3 with FSK and COM1 as Winkeyer, I would just
try it out. Note that it if does work, then it would for sure could only be used using the RRC's USB to COM port
emulator, so a real serial cable on COM1 would likely not work, use the Windows virtual port instead.
If Mike at Microbit wants to confirm this, that would be great.
73,
Mitch DJ0QN / K7DX