first step getting VAX 6000-400 booted ...

From: Peter C. Wallace <pcw_at_mesanet.com>
Date: Wed Oct 24 19:31:30 2001

On Wed, 24 Oct 2001, Carlini, Antonio wrote:

> Peter Wallace wrote:
>
> >Something I remember on RA81s is that you have to go from
> >controller --> cable --> bulkhead connector --> cable --> disk
> >
> >if you go directly from controller to disk, you end up with pins
> swapped
> >and things dont work (but nothing hurt)
>
> I think the rule is you have an *odd* number of
> connecting cables - since each cable swaps.
>
> So in a MicroVAX 3600 you can go directly from
> KDA50 controller to RA7x internal drive. Or you
> can go from KDA50 to bulkhead, bulkhead to
> bulkhead on next cab (e.g. storage array) and
> from there a third cable goes internally from
> bulkhead to final drive.
>
> In the case of a 6000 typically you go from
> KDB50 (or KDM70) to bulkhead on 6000 chassis.
> Then 6000 chassis to Storage Array chassis.
> Then internally there is a cable from the
> Storage Array bulkhead to the drive itself.
>
> I don't know how the wiring was done for
> those later kits that allowed RA9x and/or
> RA7x drives to live in the bottom of
> the VAX 6000 chassis.
>
> Antonio
>
>
>
>

Oh, OK its been a looooong time... I just remembered that if it was wrong
nothing worked and there was no indication of what was wrong...


Peter Wallace
Received on Wed Oct 24 2001 - 19:31:30 BST