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155 wiersze
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<!-- received="Sun Aug 1 07:56:53 1999 PDT" -->
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<!-- sent="Sun, 01 Aug 1999 16:01:50 +0100" -->
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<!-- name="John Vickers" -->
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<!-- email="jvickers@dial.pipex.com" -->
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<!-- subject="FAQish questions: Which scanner ?" -->
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<title>sane-devel: FAQish questions: Which scanner ?</title>
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<h1>FAQish questions: Which scanner ?</h1>
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<b>John Vickers</b> (<a href="mailto:jvickers@dial.pipex.com"><i>jvickers@dial.pipex.com</i></a>)<br>
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<i>Sun, 01 Aug 1999 16:01:50 +0100</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#0">[ date ]</a><a href="index.html#0">[ thread ]</a><a href="subject.html#0">[ subject ]</a><a href="author.html#0">[ author ]</a>
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<li> <b>Next message:</b> <a href="0001.html">Oliver Rauch: "Re: FAQish questions: Which scanner ?"</a>
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<li> <b>Next in thread:</b> <a href="0001.html">Oliver Rauch: "Re: FAQish questions: Which scanner ?"</a>
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<li> <b>Reply:</b> <a href="0001.html">Oliver Rauch: "Re: FAQish questions: Which scanner ?"</a>
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<li> <b>Reply:</b> <a href="0002.html">BARONET Eric: "Re: FAQish questions: Which scanner ?"</a>
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<li> <b>Reply:</b> <a href="0006.html">Oliver Rauch: "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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Hello.<br>
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<p>
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I'm looking for a basic flatbed Scanner & SCSI card<br>
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to use under x86 Linux.<br>
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<p>
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I have some rather FAQish questions, which didn't seem to be<br>
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answered by the docs I could find.<br>
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<p>
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The supported devices webpage raised more questions than it answered,<br>
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in that a lot of devices are listed as having some kind of support,<br>
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but the quality of that support seems to vary a lot.<br>
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Not too suprising since most of the people writing the<br>
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backends seem to have day jobs.<br>
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<p>
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<p>
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The kind of devices I'm looking at are Epson GT7000, Agfa 636, Microtek<br>
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X6,<br>
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and umax 1220S.<br>
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The Umax driver seems easily the most complete,<br>
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which unfortunately seems to make it the only choice. <br>
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<p>
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<p>
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Some of my questions concern the SCSI end of things more than the image<br>
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end. I've tried to answer my own questions - my answers may be rubbish,<br>
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so I'd be grateful for any comments.<br>
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<br>
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I get the impression from reading various SANE docs, and<br>
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some of the docs mentioned in the mail-list archives<br>
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that scanners (sub-$200 anyway), have rather half-baked<br>
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SCSI interfaces.<br>
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<p>
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<br>
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John.<br>
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<p>
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<p>
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<p>
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Q1: Can I operate a scanner on the same SCSI bus as my CD-RW & Zip<br>
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drives ? Will any SCSI-II scanner work ?<br>
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<p>
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A1: SCSI-I scanners hold on to the SCSI bus for times you<br>
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can measure on a wristwatch. No other device connected to the same<br>
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SCSI bus will work while you are scanning. If you do need to use<br>
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other SCSI devices while scanning, you could end up with<br>
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three or more SCSI busses on your machine: one for the scanner,<br>
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one for slow-ish SCSI devices like CDRW, Zip and one for fast SCSI<br>
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disk & tape drives.<br>
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<p>
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Seems like SCSI-II scanners should work, but I don't know<br>
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if they do. With data rates in the 1 megabyte/s ballpark,<br>
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they shouldn't be close to saturating a SCSI-II bus.<br>
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If there's a problem, why is it there ?<br>
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<p>
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Or is SCSI I/II a red herring ? I thought SCSI-I devices<br>
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were supposed to be able to disconnect/reconnect? <br>
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<p>
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<p>
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Q2: Are there any well-known SCSI cards that I should particularly<br>
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avoid ? What SCSI-card should I get ?<br>
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<p>
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A2: Don't use a scanner on an ultra-scsi bus. Expensive cables &<br>
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active termination required. Problematic. Just don't think about<br>
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it.<br>
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<br>
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Use a SCSI-II (Fast SCSI) PCI card, with a reasonably inteligent<br>
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controller chip (e.g. 53C8xx, 53C9xx, Adaptec etc).<br>
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Support for wide SCSI-II is not relevant - neither an advantage<br>
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nor a disadvantage.<br>
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<p>
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The above comments apply equally to external CD drives, CDRW, Zip,<br>
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and other scsi devices which don't need or support the speed of<br>
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SCSI-III (Ultra-SCSI).<br>
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<p>
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Scanners (and CDRW) are often supplied with ancient ISA-bus SCSI<br>
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cards.<br>
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These cards should be disposed of with due care for the environment,<br>
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or mounted on your wall.<br>
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<p>
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<p>
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Q3: What are the known problems with Linux Kernel SCSI support<br>
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with regard to scanners ?<br>
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<p>
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A3: ?generic scsi support broken in 2.2.6-2.2.9 (!)?<br>
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?Kernels 2.2.10 & 2.0.37 OK? <br>
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?problems with old Advansys drivers ?<br>
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?problems with old Tekram drivers ?<br>
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?problems with some 53C875 driver versions?<br>
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?problems with some 53C810 driver versions?<br>
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<p>
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<p>
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Q4: Is it required or desirable to configure my Linux kernel<br>
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in a non standard way ?<br>
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<p>
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A4: Basically no. You need to configure generic SCSI support<br>
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and support for whatever SCSI controller(s) you intend to use.<br>
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<p>
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??Changing SG_BIG_BUF may or may not help??<br>
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<p>
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Further information may be found in the doc for the backend<br>
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for your scanner.<br>
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<p>
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<p>
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Q5: Which scanner manufacturers - if any - provide or fund<br>
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SANE (Linux) support ?<br>
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<p>
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A5: ? HP and Umax ? Complete guess. <br>
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<p>
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<p>
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Q4: Which backends are being actively developed ?<br>
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<p>
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A4: ?Umax, HP, Nikon?<br>
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<p>
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Difficult to tell. Microtek2 maybe. Agfa Snapscan maybe.<br>
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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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To unsubscribe: echo unsubscribe sane-devel | mail <a href="mailto:majordomo@mostang.com">majordomo@mostang.com</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="0001.html">Oliver Rauch: "Re: FAQish questions: Which scanner ?"</a>
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<!-- nextthread="start" -->
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<li> <b>Next in thread:</b> <a href="0001.html">Oliver Rauch: "Re: FAQish questions: Which scanner ?"</a>
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<li> <b>Reply:</b> <a href="0001.html">Oliver Rauch: "Re: FAQish questions: Which scanner ?"</a>
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<li> <b>Reply:</b> <a href="0002.html">BARONET Eric: "Re: FAQish questions: Which scanner ?"</a>
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<li> <b>Reply:</b> <a href="0006.html">Oliver Rauch: "Re: FAQish questions: Which scanner ?"</a>
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<!-- reply="end" -->
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</ul>
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