[Info-vax] vax4000

[Bob Koehler]

 On Oct 12, 8:49=A0am, "nierveze" <nierv... at radio-astronomie.com> wrote:
> hello everyone
> I have a vax4000/100 .I think of using it to drive a 7 feet dish (an old
> wheather radar) with two dc motors to move it in azim and elev and two 16
> bits optical encoders to get the position.Most of the thing is already
> built.
> I know that a pc can do it but I think that most of you will agree that w=
 ith
> a vax it is lot more funny!!!
> The vax has two connectors at the rear pannel for an external qbus box.
> I have lots of drv11 cards.
> The questions are:
> what are the r=E9ferences (part numbers) of the cables and the
> interface and the'box'?Ideas where to find this at reasonable cost would =
 be
> appreciated
> It is for my hobby not professional or commercial use,the dish will be us=
 ed
> as a small-radio telescope and for ham activities (I am f1gqb).
> Thanks for your help
> best regards

   You can find the pin out and sigals on the 'net by searching for "DEC
   DRV11".  Generally for this kind of connection you need more than
   just cables, unless the device was specifically designed to
   communicate with a DRV11.  And you may need to design the interface
   using analog logic, not digital, as sometimes a 1 clock delay
   introduced by an interface device can be fatal (I had one of those).