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<!-- received="Fri Jul 25 01:00:53 1997 MST" -->
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<!-- sent="Fri, 25 Jul 1997 08:49:57 +0200 (MET DST)" -->
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<!-- name="Rogier Wolff" -->
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<!-- email="R.E.Wolff@BitWizard.nl" -->
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<!-- subject="Re: More on Mustek 8000SP adventures..." -->
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<!-- id="199707250649.IAA00784@cave.BitWizard.nl" -->
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<!-- inreplyto="m0wrYfO-000BW3C@charon.beck-sw.de" -->
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<title>sane-devel: Re: More on Mustek 8000SP adventures...</title>
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<h1>Re: More on Mustek 8000SP adventures...</h1>
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<b>Rogier Wolff</b> (<a href="mailto:R.E.Wolff@BitWizard.nl"><i>R.E.Wolff@BitWizard.nl</i></a>)<br>
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<i>Fri, 25 Jul 1997 08:49:57 +0200 (MET DST)</i>
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<p>
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<ul>
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<li> <b>Messages sorted by:</b> <a href="date.html#136">[ date ]</a><a href="index.html#136">[ thread ]</a><a href="subject.html#136">[ subject ]</a><a href="author.html#136">[ author ]</a>
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<li> <b>Next message:</b> <a href="0137.html">David Mosberger-Tang: "Re: More on Mustek 8000SP adventures..."</a>
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<li> <b>Previous message:</b> <a href="0135.html">becka@sunserver1.rz.uni-duesseldorf.de: "Re: More on Mustek 8000SP adventures..."</a>
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<li> <b>In reply to:</b> <a href="0135.html">becka@sunserver1.rz.uni-duesseldorf.de: "Re: More on Mustek 8000SP adventures..."</a>
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<a href="mailto:becka@sunserver1.rz.uni-duesseldorf.de">becka@sunserver1.rz.uni-duesseldorf.de</a> wrote:<br>
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<i>> </i><br>
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<i>> </i><br>
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<i>> > I'm writing sane-support for the Tamarack SCSI scanner. I had the same</i><br>
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<i>> > problem: my NCR810 driver would report an "NCR DEAD" when I tried to</i><br>
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<i>> > scan a slightly non-trivial amount of data. </i><br>
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<i>> </i><br>
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<i>> > Initially I increased the timeout to one minute. However nowadays, my</i><br>
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<i>> > driver simply reduces the scan-size to at most an inch at a time.</i><br>
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<i>> > The Tamarack takes less than 10 seconds to scan an inch, so there</i><br>
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<i>> > is no problem. This way I can run a standard kernel. (well almost).</i><br>
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<i>> </i><br>
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<i>> > Mustec maintainers: This might also be applicable for the mustec</i><br>
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<i>> > backend....</i><br>
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<i>> Well - I doubt the mustek will resume precisely enough (re-positioning with </i><br>
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<i>> 1200dpi reolution at the presence of mechanical parts seems non-trivial to </i><br>
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<i>> me) and it is already quite slow.</i><br>
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<i>> </i><br>
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<i>> However something a simple as decreasing the SCSI-buffer-length (or rather </i><br>
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<i>> the requested length) might do the trick.</i><br>
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<p>
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Well, that's what the Tamarack does. I don't have a mustek, so I don't <br>
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know what it actually does, but from all I hear, it is the same as what<br>
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the Tamarack does. <br>
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<p>
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Not using the full SCSI buffer length is exactly what I was<br>
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suggesting.<br>
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<p>
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The tamarack more or less scans at a constant mechanical speed. At<br>
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higher resolutions the datarate is simply higher. With higher<br>
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resolutions you easily hit buffer-size restrictions. At the lower<br>
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resolutions, a buffer simply lasts longer. That is how you can reach<br>
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"more than 10 seconds" transfers. <br>
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<p>
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When you tell the scanner not to do more than 1" at a time, it will<br>
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require a new scsi command every 1". This gives the NCR chip time to<br>
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breathe. You will not give more than 10 unneccesary breaks per scan:<br>
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there are just 11 inches to scan.<br>
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<p>
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Should you have other devices on the scsi bus, it would also be nice<br>
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if the others get a chance to the bus every ten seconds or so. I have<br>
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all my "only used occasionally" hardware on my scsi bus, so most of<br>
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the time the scanner is alone. But having a harddisk locked out for<br>
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more than ten seconds is annoying.....<br>
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<p>
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<p>
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Regards,<br>
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<p>
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Roger.<br>
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<p>
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<p>
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<pre>
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--
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</pre>
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<p>
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<ul>
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<!-- next="start" -->
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<li> <b>Next message:</b> <a href="0137.html">David Mosberger-Tang: "Re: More on Mustek 8000SP adventures..."</a>
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<li> <b>Previous message:</b> <a href="0135.html">becka@sunserver1.rz.uni-duesseldorf.de: "Re: More on Mustek 8000SP adventures..."</a>
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<li> <b>In reply to:</b> <a href="0135.html">becka@sunserver1.rz.uni-duesseldorf.de: "Re: More on Mustek 8000SP adventures..."</a>
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<!-- nextthread="start" -->
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</ul>
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