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<!-- received="Sun Aug 1 09:11:53 1999 PDT" -->
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<!-- sent="Sun, 01 Aug 1999 18:12:24 +0200" -->
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<!-- name="Oliver Rauch" -->
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<!-- email="oliver.rauch@Wolfsburg.DE" -->
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<!-- subject="Re: FAQish questions: Which scanner ?" -->
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<!-- inreplyto="FAQish questions: Which scanner ?" -->
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<title>sane-devel: Re: FAQish questions: Which scanner ?</title>
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<h1>Re: FAQish questions: Which scanner ?</h1>
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<b>Oliver Rauch</b> (<a href="mailto:oliver.rauch@Wolfsburg.DE"><i>oliver.rauch@Wolfsburg.DE</i></a>)<br>
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<i>Sun, 01 Aug 1999 18:12:24 +0200</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#1">[ date ]</a><a href="index.html#1">[ thread ]</a><a href="subject.html#1">[ subject ]</a><a href="author.html#1">[ author ]</a>
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<li> <b>Next message:</b> <a href="0002.html">BARONET Eric: "Re: FAQish questions: Which scanner ?"</a>
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<li> <b>Previous message:</b> <a href="0000.html">John Vickers: "FAQish questions: Which scanner ?"</a>
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<li> <b>Maybe in reply to:</b> <a href="0000.html">John Vickers: "FAQish questions: Which scanner ?"</a>
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<!-- nextthread="start" -->
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<li> <b>Next in thread:</b> <a href="0002.html">BARONET Eric: "Re: FAQish questions: Which scanner ?"</a>
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<!-- reply="end" -->
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</ul>
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<!-- body="start" -->
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John Vickers wrote:<br>
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<p>
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<i>></i><br>
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<i>> Q1: Can I operate a scanner on the same SCSI bus as my CD-RW & Zip</i><br>
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<i>> drives ? Will any SCSI-II scanner work ?</i><br>
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<i>></i><br>
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<i>> A1: SCSI-I scanners hold on to the SCSI bus for times you</i><br>
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<i>> can measure on a wristwatch. No other device connected to the same</i><br>
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<i>> SCSI bus will work while you are scanning. If you do need to use</i><br>
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<i>> other SCSI devices while scanning, you could end up with</i><br>
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<i>> three or more SCSI busses on your machine: one for the scanner,</i><br>
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<i>> one for slow-ish SCSI devices like CDRW, Zip and one for fast SCSI</i><br>
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<i>> disk & tape drives.</i><br>
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<i>></i><br>
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<i>> Seems like SCSI-II scanners should work, but I don't know</i><br>
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<i>> if they do. With data rates in the 1 megabyte/s ballpark,</i><br>
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<i>> they shouldn't be close to saturating a SCSI-II bus.</i><br>
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<i>> If there's a problem, why is it there ?</i><br>
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<i>></i><br>
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<i>> Or is SCSI I/II a red herring ? I thought SCSI-I devices</i><br>
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<i>> were supposed to be able to disconnect/reconnect?</i><br>
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<p>
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I don`t know any scanners that support disconnect/reconnect.<br>
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The UMAX Astras 1220S does not support it!<br>
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<p>
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You are able to use the other scsi devices on the same bus with<br>
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the UMAX scanners. But I would NOT start a scan while burning a CD.<br>
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<p>
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The UMAX scanners do block the scsi bus for some (1-3) seconds<br>
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at the start of the scan. While scanning the bus is not totally blocked<br>
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but it gets slower.<br>
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<p>
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<p>
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<i>></i><br>
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<i>> Q2: Are there any well-known SCSI cards that I should particularly</i><br>
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<i>> avoid ? What SCSI-card should I get ?</i><br>
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<i>></i><br>
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<i>> A2: Don't use a scanner on an ultra-scsi bus. Expensive cables &</i><br>
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<i>> active termination required. Problematic. Just don't think about</i><br>
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<i>> it.</i><br>
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<i>></i><br>
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<i>> Use a SCSI-II (Fast SCSI) PCI card, with a reasonably inteligent</i><br>
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<i>> controller chip (e.g. 53C8xx, 53C9xx, Adaptec etc).</i><br>
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<i>> Support for wide SCSI-II is not relevant - neither an advantage</i><br>
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<i>> nor a disadvantage.</i><br>
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<i>></i><br>
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<i>> The above comments apply equally to external CD drives, CDRW, Zip,</i><br>
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<i>> and other scsi devices which don't need or support the speed of</i><br>
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<i>> SCSI-III (Ultra-SCSI).</i><br>
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<i>></i><br>
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<i>> Scanners (and CDRW) are often supplied with ancient ISA-bus SCSI</i><br>
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<i>> cards.</i><br>
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<i>> These cards should be disposed of with due care for the environment,</i><br>
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<i>> or mounted on your wall.</i><br>
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<i>></i><br>
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<p>
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The UMAX Astra 1220S normally comes with an ISA scsi card.<br>
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It does work a bit with linux but it really is not a good solution.<br>
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<p>
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I suggest a good but relative cheap scsi card like the ncr/symbios logic<br>
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53c810 or 53c815 cards.<br>
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<p>
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<p>
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<i>></i><br>
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<i>> Q3: What are the known problems with Linux Kernel SCSI support</i><br>
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<i>> with regard to scanners ?</i><br>
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<i>></i><br>
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<i>> A3: ?generic scsi support broken in 2.2.6-2.2.9 (!)?</i><br>
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<i>> ?Kernels 2.2.10 & 2.0.37 OK?</i><br>
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<i>> ?problems with old Advansys drivers ?</i><br>
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<i>> ?problems with old Tekram drivers ?</i><br>
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<i>> ?problems with some 53C875 driver versions?</i><br>
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<i>> ?problems with some 53C810 driver versions?</i><br>
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<i>></i><br>
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<p>
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Don`t know about kernel 2.2.6 or above, 2.2.5 works<br>
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but the other should also work!<br>
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<p>
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The ncr-53c8xx (BSD) driver works well for the 53c8xx<br>
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cards you mentioned!<br>
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<p>
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<p>
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<i>></i><br>
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<i>> Q4: Is it required or desirable to configure my Linux kernel</i><br>
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<i>> in a non standard way ?</i><br>
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<i>></i><br>
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<i>> A4: Basically no. You need to configure generic SCSI support</i><br>
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<i>> and support for whatever SCSI controller(s) you intend to use.</i><br>
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<i>></i><br>
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<i>> ??Changing SG_BIG_BUF may or may not help??</i><br>
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<i>></i><br>
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<i>> Further information may be found in the doc for the backend</i><br>
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<i>> for your scanner.</i><br>
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<i>></i><br>
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<p>
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increasing SG_BIG_BUF helps til kernel 2.2.5<br>
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kernel-2.2.6 and above dynamically set the buffer size.<br>
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<p>
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<p>
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<i>></i><br>
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<i>> Q5: Which scanner manufacturers - if any - provide or fund</i><br>
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<i>> SANE (Linux) support ?</i><br>
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<i>></i><br>
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<i>> A5: ? HP and Umax ? Complete guess.</i><br>
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<i>></i><br>
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<p>
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UMAX published the scsi scanner protocol and<br>
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gives me scanners to test.<br>
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No help for parallel port scanners.<br>
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<p>
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<i>></i><br>
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<i>> Q4: Which backends are being actively developed ?</i><br>
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<i>></i><br>
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<i>> A4: ?Umax, HP, Nikon?</i><br>
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<i>></i><br>
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<i>> Difficult to tell. Microtek2 maybe. Agfa Snapscan maybe.</i><br>
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<i>></i><br>
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<p>
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I am still working on the umax backend but there is not much<br>
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to do till a new scanner comes out.<br>
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<p>
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Bye<br>
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Oliver<br>
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<p>
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<p>
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<pre>
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--
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EMAIL: <a href="mailto:Oliver.Rauch@Wolfsburg.DE">Oliver.Rauch@Wolfsburg.DE</a>
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WWW: <a href="http://www.wolfsburg.de/~rauch">http://www.wolfsburg.de/~rauch</a>
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<p>
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<p>
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<p>
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<p>
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<pre>
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--
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Source code, list archive, and docs: <a href="http://www.mostang.com/sane/">http://www.mostang.com/sane/</a>
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</pre>
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<!-- body="end" -->
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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="0002.html">BARONET Eric: "Re: FAQish questions: Which scanner ?"</a>
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<li> <b>Previous message:</b> <a href="0000.html">John Vickers: "FAQish questions: Which scanner ?"</a>
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<li> <b>Maybe in reply to:</b> <a href="0000.html">John Vickers: "FAQish questions: Which scanner ?"</a>
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<!-- nextthread="start" -->
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<li> <b>Next in thread:</b> <a href="0002.html">BARONET Eric: "Re: FAQish questions: Which scanner ?"</a>
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<!-- reply="end" -->
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</ul>
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