At least according to the guy I bought it from. It is definitely a 422 though (and I have only 232 devices.)
I downloaded the “Universal DOS something-or-other” software (only one available.) It is the same thing that is on the CD. Doesn’t do anything. Loads “Phar Lap” DOS extender (!) and complains that “PCI-BIOS is NOT installed.”
I guess it doesn’t matter. The driver is definitely working. I can see all of the serial ports and they initialize as expected (they just never report anything.)