Hi guys...
I just noticed this thread. About 7 years ago I managed to reverse engr the HP Unix firmware code and created a keygen that would enable all of the option features for this series of analyzers. In fact the code is essentially the same as the 8753 analyzers which was ported to the 871? analyzers. The features can be enabled from the front panel and you don't need to program proms, etc.
Private message me with the serial number of your analyzer and I would be happy to help you out. Please don't ask for a copy of the keygen tool, I will not give it out and please don't abuse the offer. I've had some people, who own a stack of these analyzers, ask for the enable keys so that they can increase their resell value. That upsets me. This offer is only for those of us who love the art of electronics and are not trying to generate a quick $.
Jim