On Mon, Feb 28, 2000 at 07:38:49PM +0100, Oliver Rauch wrote:
> "Kenneth E. Harker" wrote:
>
> >
> > a) How would I be able to tell if the scanner is really broken? I do
> > not run Windows at all, and my Macintosh is pre-Power-PC, so the software
> > it came with won't help me.
>
> I don`t think that it is a problem of the scanner. It is a known problem caused by
> termination, cable or scsi-driver problems.
I don't think it's the cable - I've tried two different ones with the
same result.
> > b) Could this be something like active termination vs. passive
> > termination on the SCSI bus? The scanner is obviously using passive
> > termination.
>
> The scanner does not do any termination. You mean the termination that came with
> the scanner? That is a passive one. If you work with a fast scsi card that should be ok,
> for an ultra scsi card you should use an active one.
>
> > c) Do I need to terminate the "internal" 50-pin connector on the
> > SCSI card if I don't have a hard disk or CD-ROM drive on it? How would I
> > do that?
>
> YES, YOU NEED TO!
>
> Normally there are jumpers or resistor arrays on the scsi card or the termination
> can be activated via the bios. Some cards automatically activate the termination
> but you really have to make sure it is terminated!!!
This will be the first thing I check.
There aren't any jumpers that are labelled "termination on/off" or anything.
In fact, I had to jumper the BIOS address as "disabled" in order to get
the machine to boot with the card in it - I think it was trying to use the
same address space as the IDE controller. When I got the card, I think it
had been used with a boot disk and floppy drive. I'll research this some more.
Would there be an easy way to put an out-board terminator onto that connector?
> > Any other ideas to get this working?
> >
> > d) and on another note - there's no power button on this thing, and
> > the scanning bulb stays lit _all_ the time. Is that normal?
> >
>
> The driver is responsible to turn out the light for the astra 2200, but I don`t have
> the command sequence for that.
>
> In the moment: pull the power connector to turn off the scanner.
OK - I was wondering about that. Won't that cause problems with the SCSI
bus?
> It also may be a problem of the scsi driver of your scsi cards.
> Lots of 1.x.x kernels had buggy scsi drivers. The 2.2.x kernel should be ok
> for the most scsi cards, so the 2.3.x also should be ok. But when the scsi card is a
> new product the driver may also be new and buggy.
In this case, the Ultrastor 14F card and driver have both been around since
about 1994, so I think it's a reasonbaly robust driver.
-- ---------------------------------------------------------------------------- Kenneth E. Harker "Vox Clamantis in Deserto" kharker@cs.utexas.edu University of Texas at Austin Amateur Radio Callsign: KM5FA Department of the Computer Sciences President, UT Amateur Radio Club Taylor Hall TAY 2.124 Maintainer of the Linux Laptop Home Page Austin, TX 78712-1188 USA http://www.cs.utexas.edu/users/kharker/ ------------------------------------------------------------------------------ Source code, list archive, and docs: http://www.mostang.com/sane/ To unsubscribe: echo unsubscribe sane-devel | mail majordomo@mostang.com
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