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Can it be used with X window system? X windows has key codes 0xFD01 to 0xFD1E for the 3270 terminal keys. I don't know the meaning on the actual IBM terminals, but they seem to match the key codes that are defined in X windows.

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Yeah. x3270 can take care of all the right translation things to hook into X, and has been around since '89.

There a few things that don't work straight across a telnet connection, hence the translation layer.

https://linux.die.net/man/1/x3270

Converting these keyboards to speak to a modern PC involves replacing the controller board with a new one with open source firmware. You can program the keys to send any scan code you like.

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