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Yes it supports up to 4 serial interfaces given the ports available on the Pi. You can use small USB-to-RS232 converters, and/or use the built-in USB-to-serial plus additional USB-to-serial converters and solder two MAX232 chips on the board.

I have mine connected to a TeleVideo terminal.

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I'm pretty sure you could do a lot better than 4 ports...

https://www.startech.com/en-gb/cards-adapters/icusb23216fd

Sure, but to what end? You've got 4 RS-232 devices, plus the Pi's onboard TTL serial console, and the VDU console as well. A TU-58, a papertape reader and punch, a plotter...?

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