> >>>>> On Sat, 1 Nov 1997 12:37:50 +0100 (MET), Stefan Luettringhaus-Kappel <stefan@uran.informatik.uni-bonn.de> said:
>
> >> Did anyone have the dropped line problem before sane-0.62? In
> >> 0.62, the overlapped SCSI I/O was introduced for Linux which, if
> >> the problem is timing-dependent, could make a difference.
> >>
>
> Stefan> Yes, already in 0.4x. Also, sometimes lines are missing, and
> Stefan> sometimes lines are repeated, i.e. like 12342345.
>
> Do we know that the windows driver works just fine in the problematic
> cases and that it does _not_ use backtracking?
>
David,
it did work fine with Win 3.11 using the cheap scsi card which came with
the the scanner. No idea if the windoze driver uses backtracking.
And it does work with the ncr810 and sane in color mode with 301 dpi or
more. To repeat myself: with 301 dpi or more my scanner is _much_ slower
than with 300 dpi and below, making more noise. It seems it makes many
small step at lower speed. The carriage also seems to backtrack at scsi
transfer boundaries. I can live with this quite well: I scan eyerything at
360dpi in color and do the postprocessing with gimp (I have 64MB RAM :-)
or ImageMagick. On the other hand, I don't have much time to do more
experiments, sorry. Anyway, my scanner (v1.00) seems to be a little bit
different - see my answer to your survey.
Stefan
-- Dr. Stefan Lüttringhaus-Kappel <><><><><><><><><><><><><><><><><><><><><> Institut für Informatik III Phone +49 (228) 73-4536 Universität Bonn Fax +49 (228) 73-4382 Römerstraße 164 stefan@uran.informatik.uni-bonn.de D-53117 Bonn (Germany) http://www.informatik.uni-bonn.de/~stefan/ <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
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