--- no <oliv555_at_arrl.net> wrote:
> >
> >>-----Original Message-----
> >>From: Brian Chase [mailto:vaxzilla_at_jarai.org]
> >>Sent: Monday, October 14, 2002 7:19 PM
> >>To: 'cctalk_at_classiccmp.org'
> >>Subject: New VAX 6000 toys.
> >>
> >>
> >>I've recently acquired two of those rackmount VAX 6000's that
> >>were being sold on eBay.
>
> Nice systems. Can these talk Unibus ? .... what module(s) would
> be required ?
If they can take it, you'd need a DWBUA on a VAXBI bus (there is no
Unibus adapter for XMI). ISTR when the 6000 was current that DEC
imposed a limit on how fast a machine could take a DWBUA, not to
screw the customer, but because some of the (then) newer machines
had so many layers between the Unibus peripherals and memory that
timings could not be maintained.
So... AFAIK, a DWBUA will work with some models of 6000, but not
necessarily all.
What you would need is: the DWBUA BI module itself (T1010?), four
30-pin cables, a Unibus paddle card and a UET (Unibus Exerciser/Terminator)
All parts are required. The DWBUA talks to UET registers and won't
come on unless they respond. That's where mine is. I can see the
BI register (X + 0xF0, IIRC) that holds the test results. It seems to
mostly come up with one of my three UETs, but not entirely. I also
have a DWBUA I (not quite) repaired - a DC021C chip blew up (literally)
on two modules from immediately after I moved the 8200 to my basement.
I have robbed Peter to pay Paul and moved a chip from the board with
crisped traces to the non-critically damaged board. That one seems
to have an internal memory fault with the microcontroller, according
to the error code. It does not appear to be attempting to talk to
the UET.
Perhaps someone here more familiar with the 6000 can speak with some
authority about what models a DWBUA might work with.
-ethan
P.S. - you'll also need a BA-11 with at least one DD11-DK backplane
for the actual Unibus itself, but that may be obvious.
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Received on Wed Oct 16 2002 - 01:45:00 BST