> Well, you can have an idea by looking to the guts of a 
> HP 9000/835 owned by a friend of mine. 
> http://pricorde.free.fr/museum/ul.html
> Very nice machinery. And very high quality hardware
> 
> But maybe the 9000/48 is much more ancient, if it was with PDPs...
> And I can't find any reference on 9000/48, is there a typo ?

Because it is an HP 3000/48

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