Date: Thu, 8 Apr 1999 12:36:12 +0200 (CEST) From: Oliver Fromme <olli@dorifer.heim3.tu-clausthal.de> To: freebsd-scsi@FreeBSD.ORG Cc: groggy@iname.com Subject: Re: scanners Message-ID: <199904081036.MAA19234@dorifer.heim3.tu-clausthal.de>
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Steve Howe wrote in list.freebsd-scsi:
> i'm setting up FBSD 2.2.8 for a friend that has a 2940UW. he wants a
> scanner (either a UMAX 1220S or the new HP with the document feeder).
> i've been reading the maillists, and it seems many people are having
> trouble with scanners, CAM, and SANE (whatever that is ;).
SANE ("scanner access now easy") is a bunch of drivers and
tools to access scanners under UNIX. It can be used as a
plug-in for gimp, for example.
I _strongly_ recommend that you put the scanner on a separate
SCSI card. UMAX scanners have a broken SCSI interface which
_blocks_ the whole bus during scanning. They're not really
designed to live with other devices on the same bus. The HP
scanners are better (at least we have a HP ScanJet-6100C
hanging off a Sun without such problems).
Using a separate controller for the scanner will also reduce
your cabling problems. For an Ultra-SCSI bus, the maximum
cable length is 1.5m (that is, internal plus external cables).
At least in theory -- if you have high-quality cables,
terminators and wide-to-narrow adapters.
> 1. are all SCSI scanners compatible? even if they have a document feeder?
I'm not sure if SANE supports the document feeder. You should
refer to the SANE documentation. it also contains hints about
the various scanners and how "compatible" they are.
> 2. i remember reading problems about putting 50/25 pin adapters on 68 pin
> connectors - is this still a problem? the external 2940UW connector will
> have to drop to 25 pins for the scanner, and probably the zip drive.
>
> it is also a concern, since the 68 pin internal connector must be used for
> the IBM HD, but i need to attach the CD/RW and the CD internally. as you
> know, you can only use 2 of the 3 connectors on the 2940UW.
Save yourself a lot of trouble and get a separate SCSI adapter
for the external devices. It doesn't even have to be an ultra
fast one, because scanner and ZIP drive don't require much
bandwidth.
> 3. what additional software do i need to pick up to do this stuff besides
> the 2.2.8 dist and the kernel sources? i don't see anything about htis
> stuff in the documentation and i'm new to SCSI stuff.
Why 2.2.8? I'd go for a recent 3.1-stable snapshot.
When creating the kernel config file, be sure to include all
devices that you need for the SCSI stuff. In particular, for
the scanner you'll need the "processor target" device (pt0).
SANE is in the ports collection (graphics/sane), it contains
more docs about how to set it up with your scanner (there are
"sane-umax" and "sane-hp" manual pages which you probably want
to read).
Regards
Oliver
--
Oliver Fromme, Leibnizstr. 18/61, 38678 Clausthal, Germany
(Info: finger userinfo:olli@dorifer.heim3.tu-clausthal.de)
"In jedem Stück Kohle wartet ein Diamant auf seine Geburt"
(Terry Pratchett)
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