> 
> I understand that the VAX 6400 has the RIEGEL chip and also
> comes with a vector processor. I notice special 50-or-so pin
> receptacles on the front of the CPU board. Is this where the
> tight connection to the vector board is made? Does anyone
> know the part number or anything about those vector modules?
> Where might one get some? Has anybody ever actually seen one?
> Where would one get the programming reference specifications?
> 
Well, I collected a 6410VP yesterday. And yes, the 50-or-so pin
ons the front is to connect to the vector unit.
How to use it is described in for example the VAX/VMS assembly
programmers reference or similar new doc. 

-- Ragge