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Emitting UTF-8 when the settings clearly say "no UTF" is a bug, no matter if a real VT220 is on the other end, or something else that doesn't understand unicode (which is still quite possible, even today). It's even a bug if unicode actually works on the other end (but in that case, nobody notices).

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Yes, that's another issue that luckily seems to have been fixed in the linked bugticket.

Still, using antique hardware for interfacing with modern systems is something that would surprise me if I found it used in the wild. I know that the standards are well-defined and that the software support is there - it just certainly isn't the norm.

So you agree, sending non-vt220 codes to a vt220 device is unacceptable? :)

Yes, sending commands to a device that is not capable of accepting these commands is a bug. Good now? :D

That's not the root cause.

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