[Coco] My beloved coco seems to have had a stroke

[David Ladd]

If the drive you disconnected is the last scsi drive on the chain you will
need enable termination on the other drive and make sure the end of the
cable is plugged into it.

Scsi can be picky on that.
On Sep 24, 2012 10:35 AM, "Gene Heskett" <gheskett at wdtv.com> wrote:

> On Monday 24 September 2012 11:13:45 Robert Gault did opine:
>
> > Gene Heskett wrote:
> > > Tonight, on powering it up (it has hdbdos) it shows the HDB-DOS1.0A in
> > > the middle of the screen, and essentially stops.  It usually waits
> > > for the hard drives to spin up and do their initial calibration
> > > sweep, and assert the drive ready signal, at which point that 15
> > > second countdown of marching dots that gives one time to hit the key
> > > indicating what to boot from, or take the default hard drive boot.
> > >
> > > I can hear at least one drive do that head scan, but the upper drive
> > > HD 1 never turns off its little led unless I remove its drive cable.
> > > HD 0 does flash it once at powerup, for maybe 1/4 second.  And the
> > > countdown dots never start.  Ever.
> > >
> > > Hitting the reset button at that point, then typing DOS0 gets an
> > > instant I/O error, which may be that I need to do a drive off or
> > > drive on first, I've forgotten which enables the first 4 floppy
> > > drives.  Power supply voltages to the multipak, and to the drives are
> > > good, the 5 volts is about 5.08, the +12 for the drive motors is
> > > about 11.98.
> > >
> > > Next step suggestions please.
> > >
> > > Cheers, Gene
> >
> > Gene,
> >
> > What happens if you disconnect HD0 from the system? Do you then have
> > access to the other drive?
> >
> IIRC the bottom drive is drive 0.  Disconnecting either/both has no effect.
> I'll have to dis-mount the drive to be able to read the jumper table on top
> of it to verify the assignments for sure.
>
> Unplugging the TC^3 gets a hard drive not available message.
>
> > I've a very old SCSI Tandon TM 252 drive as one of two in my system. At
> > random, it gets stuck on the landing pad and I have to move the heads
> > manually to get it active. Same symptoms as yours, drive light always
> > on but no I/O.
>
> This is stiction then?  When both are plugged into the cable, its the upper
> drive whose access led (its on the bottom of the pcb) stays on.  I can only
> hear one calibration sweep.  The drives are identical Seagate 1Gb Hawks,
> but I wouldn't think the spin up times would be that well synchronized.
>
> I would assume too, that unplugging what I think is drive 1, should allow
> drive 0 to proceed.  But it does not.
>
> I'll have to do major house cleaning to make room to dis-mount them and
> power them up laying where I can bump them on a corner to assure starting,
> and will see about that today after loading about 40 rounds to fire form a
> 30-06 into a 30-06 Ackley Improved.  Its getting on toward deer season &
> I'm rusty.  The right end of the desk has at least a foot of paper piled
> up, and likely several boxes of shells since my reloading bench is only 2
> feet away.
>
> Thats the toys will expand to fit all available space theory at work.  I'm
> sure you are familiar with that, its a corollary of Murphy's Law :)
>
> Thanks Robert.
>
> Cheers, Gene
> --
> "There are four boxes to be used in defense of liberty:
>  soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> My web page: <http://coyoteden.dyndns-free.com:85/gene> is up!
> You will be married within a year, and divorced within two.
>
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