home *** CD-ROM | disk | FTP | other *** search
- Path: news.gpnet.it!news
- From: Mark Marin <megavolt@pop.gpnet.it>
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: Warp Engine's termination?
- Date: Mon, 29 Jan 1996 19:58:07 +0100
- Organization: GP Net - Venezia - Italy
- Message-ID: <310D18BF.27E1@pop.gpnet.it>
- References: <4e6i4b$up@peippo.cs.tut.fi> <4e86kr$or3@nonews.col.hp.com>
- NNTP-Posting-Host: @ts3112.gpnet.it
- Mime-Version: 1.0
- Content-Type: text/plain; charset=us-ascii
- Content-Transfer-Encoding: 7bit
- X-Mailer: Mozilla 2.0b6a (Macintosh; I; 68K)
-
- David K Martin wrote:
- >
- > Mika Kortelainen (k125374@korppi.cs.tut.fi) wrote:
- > : Does anyone know if Warp Engine's onboard SCSI termination is
- > : passive or active? I tried to find the answer from the manual
- > : but didn't...
- >
- > : The reason for asking this is that I get more or less random
- > : read errors from my HD's and I was told that passive termination
- > : at Fast SCSI-II speeds is quite a common source for problems.
- >
- > It's passive termination. You might try removing the resistor packs
- > from the W.E. itself if you are using both internal and external
- > SCSI devices (assuming that both ends of the chain are properly
- > terminated). On my W.E. (A4000 version) the packs are socketed right
- > next to the SCSI header and are a genuine pain in the butt to get to.
- > All the SIMMS have to be removed and tweezers are required to pull or
- > insert the packs.
- >
- > Dave Martin - dkm@col.hp.com
-
- THe way the Warp Engine is hooked up, it s expected to be at one end
- of the chain, and the last drive on the chai is also supposed to be
- terminated. For this, you can leave (and should) the resistor packs
- in place. A likely cause for your trouble is that some (newer)
- drives require power to be sent to their terminal resistors. THere
- is a jumper on the WE that is OFF by default. It must be turned o
- (some REALLY OLD drives don't survive long if power is supplied to
- this wire, so they let you be the one to decide to turn it on).
-
- Lets see, the manual shows it as JP1, SCSI Termination power. THis
- isright near the SCSI connector. My Bernoulli was very unreliable
- with this in it's default off position, but with it on it works
- fine. ALso there are slower settings that can be set (some drives or
- long cables can't use 100ns synch), so you might have to change some
- of them (as a last resort). Oh, you do have good, well seated
- cables, right?
-
- Mark
-