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Re: Adaptec 29160LP (aic7892)
On Tue, May 08, 2001 at 05:13:17PM +0300, Ariel Biener wrote:
>
> See if you heard of this one. I have an Adaptec 29160LP adapter (uw-2
> 160). I connect to it an IBM 9GB uw2-160 10k rpm disk, internal. It
> recognizes it, and all works well.
>
> The adapter has an external connector (the new slim Mylex type). I have
> a SCSI cable, approx 1m, one end the slim mylex type, the other end, 68
> pin. I have an 68pin-to-centronix (the old big and roundish scsi
> connector, also known as scsi-1) converter, connected to the 68pin end of
> the cable.
> Now, I have a chain, starting with a dds2 scsi tape, then a HP 9600si
> external CDRW, and on the end of the chain, an Umax Astra 2400s scanner.
Ugh! Don't! You're running a 160 device together with a 5 device (the
scanner or the tape). The disk will most probably barf down to 40 or 20
in any case ;-). You are underusing the bus.
Also, scanners are frequently made self terminating with VERY lax
standards compliance practices. Try unhooking the scanner and TERMINATE
WELL.
> I played with this, by shutting down each of the external scsi devices
> in its turn, but as long as the external cable is connected, the disk
> remains at 40Mhz !!! When I finally disconnected the external cable, it
> went back to normal. I also tried to change cables, and to swap the order
> ot the devices, and such, but to no avail.
Add _ONE_ device per test. Add CDRW first, tape second, scanner third.
I suspect scanner. Remember to terminate.
> Does anyone know anything about this ? If not, I'll just throw in
> another 2940 controller, and be done with it.
This is a good idea, anyway, running the disk and the drek devices on
separate channels. Like, you know, separate but equal. ;-)
>
> --Ariel
>
> --
> Ariel Biener
> e-mail: ariel@post.tau.ac.il
> PGP(6.5.8) public key http://www.tau.ac.il/~ariel/pgp.html
>
>
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--
---MAV
Linguists Do It Cunningly
Marc A. Volovic marc@bard.org.il
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