16 Feb
2002
16 Feb
'02
1:54 a.m.
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