🚀 go-pugleaf

Shannon Jacobs <shanen@my-dejanews.com> wrote in message news:7gkj59$a0e$1@tipgw2.t-kougei.ac.jp...
> Well, it's been an interesting thread already, but I'm feeling a lot of heat
> without seeing much light so far....  But I'll try to read through some of
> the new FAQs which have been referenced.
> 
> 
> <snip>
> >Both physical ends, and only the ends, of the cable must be terminated,
> >and any devices between the two ends must have termination disabled.
> 
> That's what I thought, but...  Right now it continues to work best with NO
> terminator on the scanner.  I vaguely think this proves the scanner must
> have internal termination of some kind, though I see no way to disable it.
> So why did they provide the passive terminator in the first place?  Beats
> me.
> 
> I'm also concerned about the fact that the passive terminator is the 25-pin
> type.  However, all the cables are 50-wire and the scanner is at the end,
> connected to a normal cable.  Someone in another post suggested it was a Mac
> scanner, but even though some of the new Macs have PCI bus slots, I'm pretty
> sure there is no Mac software here, and that this is intended for use with
> Windows 9x.

Most low-end scanners for both PC and Mac now come with 25 pin SCSI
connectors.  It's called "Apple type" SCSI because Apple was the first company
to use it as a "standard", even though it never existed in the SCSI specs.

Some scanners do provide internal termination.  Ask the manufacturer.


> <snip>
> >As far as the scanner locking up your system, that's caused by using a
> >non-busmastering SCSI card.  You say you're not using the card that
> >came with the scanner, so what card are you using?  An Adaptec 2906
> >or 2902E (or similar busmastering card) should fix the problem.
> 
> The SCSI card I'm actually using is a PC card type.  It's a Japanese brand,
> so this probably isn't going to do much good, but on the card it says:
> Logitec LPM-SCSI2E SCSI-2 Card UltraSMIT.  This is the card that came with
> the active terminator (which I'm not using).  But I think that this implies
> it is supposed to be a faster and newer SCSI interface than the one that
> came with the scanner, though I don't know how to find out about the bus
> mastering.  I'll try digging in the manual, but this is going to be pushing
> my Japanese to new limits...

Low-end scanners don't send enough information to max out even a SCSI-1,
5MB/sec card.  What's important for performance is that the card supports
bus mastering.  You could try an Adaptec 2906 to see if makes any difference,
then return it if it doesn't.

Frank