I have a serial terminal that is not working. It's a VT525 using an external monitor (of course) and PS/2 PC keyboard. The self-test passes fine; setup works fine. I can echo characters when local echo is on. However I don't believe it is actually transmitting characters out of the serial port.
I started trying to get it working on a raspberry pi with a USA-19HS USB serial port according to several guides. Though the USB port was correctly recognised as ttyUSB0 the terminal does nothing.
So I tried the most basic test, loopback. Terminal is reset to factory settings and flow control (both hardware and software) is off. If you then use a loopback plug in the serial connector, simply bridging pins 2 and 3 (these are TD and RD on both DB25 and DB9, only reversed), shouldn't the terminal display any typed character just as if it had been sent and then echoed back bye a remote system? If you do this with local echo ON you should get duplicates of each character?
Terminal so far shows nothing when local echo is OFF.
Really looking forward to playing Nethack again with genuine scanlines...