[sane-devel] USB scanners page

[Theodore Kilgore]

Gerhard,

Please see the bottom of this message for the source of my confusion about
whether the N670U has an LM9833 or a LM9832. No, my memory has not been
playing tricks. But I am still confused.

Theodore Kilgore

On Fri, 4 Oct 2002, Jaeger, Gerhard wrote:


> On Wednesday, 2. October 2002 17:00, Theodore Kilgore wrote:
> [SNIP]
> > I thought it is the case that the Canon N670U has an LM9933 chip in it?
> > Maybe my memory is playing tricks?
> [SNAP]
>
> Hi,
>
> AFAIK, the N670U uses the LM9832 and the N676U uses the
> LM9833, rather the same chip, but the LM9832 has an 14bit adc
> and the LM9833 uses an 16bit adc...
>
> -
>  Gerhard
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> Sane-devel mailing list
> Sane-devel at www.mostang.com
> http://www.mostang.com/mailman/listinfo/sane-devel
>

--------------previous message on this topic begins here -----------------
>From g.jaeger at earthling.net Sat Oct  5 12:34:47 2002
Date: Sun, 27 Jan 2002 13:34:46 +0100
From: "Jaeger, Gerhard" <g.jaeger at earthling.net>
To: Theodore Kilgore <kilgota at banach.math.auburn.edu>, sane-devel at mostang.com
Subject: Re: [sane-devel] Canon N70U (fwd)

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Hi Mr. Kilgore,

sorry for the late response, I'm currently (well probably not onyl currently
;-)) very busy and so im bound to answer questinos concerning my work
on the LM983x stuff only late in the evening or at weekends...

Let me first try and answer the questions:
We know that inside the N670U resides a LM9833 chips because someone
was crazy enough and opened the device - and all our tests shows that
this is true - further parts of the current Plustek-Backends seems to
work with the scanner.
Currently I'm in contatc with Siegfried Loeffler who owns a Canon N670U
and tries to make the thing work.
CIS means Contact Image Sensor and is one possibility for a scanning
device to convert image information to digital data. CCD is the other
technical solution (Charged Coupled Device).

Well we work sometimes on documentation we got from the manufacturers
and sometimes on assumptions. (Of course wild guesses too ;-)

We hope to make the Canon device work as well, but there's no guarantee
for this...

Regards
   Gerhard Jaeger

On Friday, 25. January 2002 23:51, Theodore Kilgore wrote:
> I joined this mail list yesterday because of the problems indicated in the
> message below. Due to inexperience with such lists and with funny
> web-mail setups when I am so used to pine :(  I apparently did not succeed
> in getting the message posted. Anyway, I would welcome contact and
> constructive suggestions, couched, I hope, at my level. What's that? well,
> I would characterize myself as a theoretical mathematician with a knack
> for practical things, such as fixing the car, and a longtime, serious
> Linux user, installer, and maintainer (part of my job at this point),
> hardware hacker, but definitely not a programmer.
>
> So, anyone else out there want to work with the Canoscan N670U?
>
> Then read on. You will see pretty soon what I know and what I don't know,
> from the message below.
>
> Theodore Kilgore
>
> ---------- Forwarded message ----------
> Date: Thu, 24 Jan 2002 21:58:45 -0600
> From: kilgota at khayyam.math.auburn.edu
> Reply-To: kilgota at banach.math.auburn.edu
> To: g.jaeger at earthling.net
> Subject: Canon N70U
>
> Dear Mr. Jaeger,
>
> I am very interested to learn that you are also one of those
> unfortunates with a Canon N670U. I was given one of them for Christmas
> by a relative who should have known better. He is a computer engineer,
> but he thinks perhaps too much of my abilities in Linux. Anyway:
>
> I have been working on supporting this thing, too, without really
> understanding anything very deep of what I am doing  (I have to keep
> stressing this so you don't decide all of a sudden later on that I am
> actually ignorant as hell).
>
> I have another box for testing purposes, which dual-boots Linux and the
> competition's '98 model.  I have installed the sniffer and collected a
> couple of logs. One of them after bz2-ing will even fit onto a floppy!
>
> I have also tried out (blindly, of course) to adapt a driver for an
> existing machine to run. I started with V. Dergachev's driver for the
> Canon 1220U. With a couple of "cheat" modifications, that will pretend
> (but only pretend, alas) to scan and will exit successfully after the
> "completion."
>
> Also by guessing I have tried out the plustek driver, too, because it
> seemed close. I only get an I/O error message.
>
> Therefore, a couple of questions:
>
> 1. How does anyone know this thing has a LM9833  in it? And what is this
> other chip you folks are talking about? Or is CIS another type of
> interface arrangement and not another chip? So, seriously, how did
> anyone discover this, or is it just guesswork?
>
> 2. Don't expect much positive information from me, but I will be glad to
> help out by testing things. Just send them. And please share some of
> your clever ideas with the old math professor in Alabama.  I want my
> scanner to work, too.
>
>
> Theodore Kilgore
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