DEC RM05 mountings

From: Mike Cesari <mcesari_at_comcast.net>
Date: Mon Oct 4 14:24:40 2004

On Oct 4, 2004, at 12:22 PM, Jules Richardson wrote:

> On Mon, 2004-10-04 at 16:14 +0000, Jules Richardson wrote:
>> On Mon, 2004-10-04 at 09:45 -0600, Mike Cesari wrote:
>>> On Oct 4, 2004, at 8:11 AM, Jules Richardson wrote:
>>>
>>>>
>>>> Does anyone know how an RM05 drive assembly fastens to the massbus
>>>> control cab beneath?
>
> Right, I'm confuzzling myself here.
>
> So, the upper part of the RM05 just contains the pack and head
> assembly,
> whilst the cabinet beneath contains just PSU, blower unit, and
> interface
> cables? There's no read/write logic in that lower cabinet (or the drive
> above) at all?

There should be a card cage for r/w/servo/etc. electronics. Cables
(memory
fuzzy here on details) go to the heads and positioning servo. 2 ribbon
cables
(certain here!) go to the massbus interface. (A *modified by DEC* SMD
interface.)

>
> Then there's a seperate cabinet (which we need to find) which actually
> has the read/write logic for the drives and in turn hooks to the back
> of
> the 570?

Fat round grey (standard massbus cable) between the RH70 and the RM05
massbus
interface.

>
> What's confusing me is that there are four connectors (dual port,
> in/out) inside the cabinet that sits beneath the drive assembly. Those
> look to be exactly the same as an output connector on the back of the
> DECsystem. That's what was making me think that the back of the
> DECSystem plugs straight into one of those connectors on the lower
> drive
> cabinets (I assumed the out on one cab then chains to the input on the
> next one etc.), and that there was no 'missing cabinet' and that all
> the
> read/write logic and massbus interface was in the cabinets below each
> drive. Seems odd they'd use the same connector for two different
> applications (machine to control cabinet, then control cabinet to each
> drive)
>
> Yark!
>
> Jules
>

Aha!
Sounds like you have an RM03, not an RM05. The RM03 has 6 heads and the
RM05
has 20. In the RM03, everything fits into one cabinet. Not the case for
the
RM05. This is because space in the RM05 is taken up by the deeper disk
pack
enclosure and the larger motor.

Isn't this fun?

Mike
Received on Mon Oct 04 2004 - 14:24:40 BST