The HP9000 line is alive and well (I hope ... we just took
delivery on a new system).  There may be older models that HP
no longer supports though.

We have HP9000 k200s & k260s that are full size cabinet
mounted systems.  There should be a data plate somewhere that
would tell you the full model number (ie HP9000 Model k260).

[educated guessing ahead] You *should* be able to run most
flavors of Unix, otherwise you may need to stick with HP/UX

> The last time I dealt with one, HP was trying to buy back old
> systems so they could junk them, and not have to deal with the
> support aspects.
>
>> Does somebody knows anything about HP 9000 series.
>> It has 2,5MB of memory, a 5.25" FDD, no HDD, and I don't
>> know hat kind of OS would work on it.