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Date:	Tue, 9 Sep 2003 12:22:27 PDT7
From:	"Steven Levine" <steve53@earthlink.net >
Reply-To:	scoug-help@scoug.com
To:	scoug-help@scoug.com
Subject:	SCOUG-Help: Re: Getting SCSI cards into very tight spaces {Was: Next Help Desk}

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In <3F5E2D19.1021A09C@pacbell.net>, on 09/09/03
at 11:41 AM, "J. R. Fox" said:

>About time we changed that header, dontcha think ?

Especially if we are going to put it back on the SCOUG list.

>One would think so. But then, it just needs to be the teensiest bit off,
>to really complicate your life.

I'm often amazed at the mechanical tolerances that we work at without even
thinking. One of my long time customers does silicone extrusions. When I
first started, typical tolerances were on the order of .0005" which is
pretty good when you consider that the stuff is squirted out a a die at
high pressure while the material is essentially a liquid and then it cures
as it cools. Current tolerances are probably 5x better.

>But I just got the card in. I had to take the screw-down guide / bracket
>off, which proved less of a problem than I expected. Then, I had to get
>the bracket in by its lonesome, which took some maneuvering. Finally the
>29160, which could *then* be aligned with the PCI slot and the hole in
>the bracket. It went in cleanly.

That is odd. It really seems like the motherboard is not correctly
aligned with the slots on the back of the case. Now that both the bracket
and the card are installed, can you screw the bracket and the card
together? That would keep the card from coming unseated.

>As was already clear, the back section
>is hanging there in space, slotless.

You mean the upper 32-bit section of the PCI-bus edge connector?

>While I'm thinking of it, you mentioned that you use a 2940UW for your
>slower SCSI devices. I have the 2940U and the 2940AU. Is the UW a
>later, faster version of this card, and would I gain anything by
>switching to it for driving my scanner, CD drives, and tape backup unit ?

For narrow devices, the max bus speed SCSI Ultra is 20MB/sec. This should
be well beyond the limits for any of the devices you mention. I am
assuming your tape unit is DDS-2, TR-4 or something in that class.

Steven

--
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"Steven Levine" MR2/ICE 2.37 #10183 Warp4/FP15/14.093c_W4
www.scoug.com irc.webbnet.info irc.fyrelizard.org #scoug (Wed 7pm PST)
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