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<H1>Re: please advise: Mustek 12000SP, NCR810 &amp; color stripes</H1>
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<STRONG>From:</STRONG> FJA van Zijp (<A HREF="mailto:ferencj@xs4all.nl?Subject=Re:%20please%20advise:%20Mustek%2012000SP,%20NCR810%20&amp;%20color%20stripes&In-Reply-To=&lt;3A6B66E0.15875.B464B5B@localhost&gt;"><EM>ferencj@xs4all.nl</EM></A>)<BR>
<STRONG>Date:</STRONG> Sun Jan 21 2001 - 13:46:56 PST
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Hi,
<BR>
<P>Well, whaddayaknow. It works. I wrote I connected the Mustek to a
<BR>
noname NCR810 card, but actually it was connected to my Asus
<BR>
SC200 SCSI card. Ah well, shouldn't matter, thinks me.
<BR>
<P>But it turns out it does matter. The scanner now IS connected
<BR>
(solely) to the noname NCR810 card, the rest (ZIP and CDROM) is
<BR>
on the SC200. No more colored stripes.
<BR>
<P>I'm still curious. Anybody ANY idea what was going on?
<BR>
<P><EM>&gt; &gt; I've read somewhere (in SANE docs?) that this Mustek should be
</EM><BR>
<EM>&gt; &gt; terminated (by me). But my active terminator makes the line
</EM><BR>
<EM>&gt; &gt; phenomena a lot worse. What is it with this scanner? Doesn't it
</EM><BR>
<EM>&gt; &gt; follow SCSI specs, or has it auto-termination?
</EM><BR>
<EM>&gt; I wouldn't trust scanners to follow SCSI specs, specially if they come
</EM><BR>
<EM>&gt; as a package with SCSI card etc. My acer caused problems with other
</EM><BR>
<EM>&gt; devices on the same chain until I removed from the PCB a bunch of capacitors
</EM><BR>
<EM>&gt; they had put on the SCSI signal lines. They either put them on for EMI or
</EM><BR>
<EM>&gt; an attempt to sort of terminate but caused too much reflection when you
</EM><BR>
<EM>&gt; had other devices on the chain which were using faster data rates.
</EM><BR>
<P>I've got an old SONY-cdrom with similar thingies to what you
<BR>
describe. I'm quite sure they're for passive termination. If I
<BR>
remember clearly, passive termination consists of resistors of a
<BR>
certain Ohm, active termination actually keeps a certain voltage on
<BR>
the signal lines (with thyristors?.)
<BR>
<P>cheers
<BR>
<P>Ferenc
<BR>
<P><PRE>
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