Time travel

And what the hell, add RS-422 while you’re at it. And a parallel port! And the left side expansion port they used to have on the Amiga 500 and 1000!

I have a 485 adapter in my bag for BACnet and Modbus communications.

Hook up my US Robotics 56k modem and dial up to the internet, where I can chat with hot babes

-485 is superior. Everyone knows it

UART consoles and model train control systems come to mind.

You’d be surprised to know how much of the world’s manufacturing infrastructure still uses it.