# Re: Microtek ScanMaker V300?

Brian E. Bothwell (brbothwe@cs.indiana.edu)
Tue, 22 Sep 1998 13:56:43 -0500 (EST)

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On Tue, 22 Sep 1998, Mike D. wrote:

> David B. Rees wrote:
>
> > echo "scsi add-single-device 0 0 6 0" > /proc/scsi/scsi
> >
> > command with root. The green light at the front of the scanner turns off, and
> > then the computer starts becoming unresponsive. If I don't turn off the
> > scanner, eventually the kernel freezes. Turning off the scanner allows the
> > scsi driver to return to normal. Leaving the scanner on during boot seems to
> > work fine. Maybe I should test this thing under win95 (ugh) just to make sure
> > it works. This is a Tekram 390F (UltraWide). I am using a SCSI-3 cable (68pin
> > on one end, 50pin Centronics to the scanner, with an inline passive
> > terminator). Could the terminator be the problem? I don't need an active
> > terminator, do I?
> >
>
> I could be wrong, but I believe that Ultra and above scsi needs active termination.
>
> At least that is what the manual for my BusLogic card says.
>
> mike
>

I have seen such behavior on even SCSI-II systems if passive terminators
were used (not with a scanner). Switched to active terminators and the
flakiness went away. I read somewhere that the SCSI-II (and I presume
SCSI-III) standard requires active termination. I figure it's worth the
$3-4 difference to eliminate at least that as a possible source of
problems.

-brian

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