uVAX II + KFQSA + DSSI Drive and the last touch?

From: jkunz_at_unixag-kl.fh-kl.de <(jkunz_at_unixag-kl.fh-kl.de)>
Date: Sat Feb 16 09:54:11 2002

On 16 Feb, Gunther Schadow wrote:

> I don't know much about DSSI however
In terms of cablning it is similar to SCSI. One bus, no Y, terminators
at bouth ends. Every drive needs his ID.

> But at the end of that cable is a male connector with about
> half as many pins.
Sure about the pins? DSSI uses HD-DB 50 for external connectors.

> What is that for,
External devices or...

> please don't say it's a terminator,
a terminator.

> where the heck would I get such a terminator from?
Comcrap?

> Could I
> just connect the round cable directly to one DSSI drive without
> that bus cable, such that I would not need that terminator?
Hmm. I have a RF72 DSSI disk in my MV 3900 _without_ terminator. This is
not the way it schould, but as the cable from the KFQSA to the drive is
only around 30cm, it works.

> And of course the drives have front panels and I have three
> drives and just one front panel. How essential is that front
> panel?
front panel != front panel. There are panels that can be connected to
three drives... The main purpose of the panel is to select the drive ID.
The RF72 in my MV3900 runns fine without panel.

> Has anyone ever installed DSSI in a uVAX-II with the small
> cabinet?
You mean a BA23?

[RQDX3 cable]
> What if I throw all this stuff out and use that flat cable
> to route the KFQSA into the front and hook up the DSSI
> drive where I have the MFM drive now and put in a TK50
> where the RX50 is now. Anyone ever done that?
Never done that, but it should work. You don't need to unmount the RQDX3
distribution panel, just unplug the cable. Beware of the twist in the
cable. I had once a cable from a BA23 with that ID noses on the
connectors. One of the connectors was crimped the wrong way, i.e. pin 1
to pin 50. Due to the nose it was not possible to use the cable for
somthing else. But this problem can be fixed with a knife...

> I must also say I really appreciate the VAXBI and XMI busses
> with their zero-insertion force and their clean way of
> connecting peripherals all to the backplane instead of
> just anywhere in the front.
Grmbl, grmbl. Not everyone is the happy owner of multiple VAX 6000
systems ... So we MicroVAXer have to be satisfied with ordinary QBus
systems.
-- 
tschuess,
          Jochen
Homepage: http://www.unixag-kl.fh-kl.de/~jkunz
Received on Sat Feb 16 2002 - 09:54:11 GMT

This archive was generated by hypermail 2.3.0 : Fri Oct 10 2014 - 23:34:47 BST