"Old PC" emulation ?

[Fred Cisin]

On Wed, 3 Nov 2004, Dave Brown wrote:
> I've not come across it with serial ports but it's a common problem
> with older hardware that connected to the system bus- I have several
> older GPIB cards that won't run in anything later than a 286 and an
> EPROM burner card that won't operate in anything later than a genuine
> XT.

The Cordata/Corona Data Systems laser printer interface card
is for PC/XT.  Attempting to install the software on 286 or
above gives a message telling you not to, and mentioning a
286 version of the board that may or may not have ever existed.

Is the hardware actually incompatible?
Or is it a bogus test by the software?