ah - well it will print in colour but minus any yellow - so cyan and
magenta are OK and it's a vintage HP840C so doubt there's anything
flash about it...

I had the 870Cxi - great printers !

One thing you might not know about which might make it useful still
is that manufacturers use the yellow ink to secretly "mark" the
prints (it can see seen under a blue light) - it gives the date and
serial number of the printer used, and is ISN'T a function of the
driver used - they do this secret mark-up regardless.

If you need to print any legal documents "after the event" perhaps
that's the one to use ;-)

(i.e. EPOA - enduring power of attorney forms etc. - the system that
replaced it is more expensive, complicated, and harder to manage)