Is it possible to use a serial terminal (e.g. VT420) with a modern Mac? I've found lots of tutorials for using a Mac to control a serial device, but not the other way around.  I've got a DEC VT520 terminal and a recent Mac Pro, is there a way (with a USB adapter) to get a shell on my Mac from a hardware serial console?  Basically I'm looking for an OS X version of the "Ubuntu Serial Console HowTo".  Or is this so ridiculous that no one has tried it?
I have not tried this, personally, but there are good instructions for doing so with a Tripp Lite (née Keyspan) USB-to-Serial adapter and an Apple IIc. Obviously, you can ignore the Apple II-specific parts of the instructions (the majority of the article) and focus on the adapter, the cable, and getting ttys to run getty.