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Newsgroups: comp.os.386bsd.questions Path: sserve!newshost.anu.edu.au!munnari.oz.au!uunet!math.fu-berlin.de!easix!knobel!andreas From: andreas@knobel.GUN.de (Andreas Klemm) Subject: Re: Elusive SCSI problems (Adaptec 1542C) <snarl!> Organization: Andreas Klemm, D-4040 Neuss 21 References: <1993May14.004015.23497@sophia.smith.edu> <hastyC708F2.CGH@netcom.com> <C70nBJ.387@world.std.com> <1993May14.155303.6702@sophia.smith.edu> <1993May28.153410.10495@cs.wisc.edu> Message-ID: <1993May31.091928.822@knobel.GUN.de> Keywords: Adaptec 1542C, Quantum, SCSI, 386bsd Date: Mon, 31 May 93 09:19:28 GMT Lines: 87 In <1993May28.153410.10495@cs.wisc.edu> jcargill@oka.cs.wisc.edu (Jon Cargille) writes: |In article <1993May14.155303.6702@sophia.smith.edu> jfieber@sophia.smith.edu (J Fieber) writes: |> |>When I called adaptec tech support, the person *kept* asking if I |>was using external devices. I then saw this post and understood why. |> |>I don't have anything external, yet I still have problems. |> |> 1542c ----- Q P105s ----- Q PD210s ----- Archive Viper |> ID#7 ID#0 ID#1 ID#2 |> |>the 1542c and the archive viper have termination on. Turning it |>off at either end has no effect, turning it off it both ends |>makes nothing work. (surprise.) Could it be possible that your internal scsi cable isn't ok ? I use twisted cable. They should be better. Or another idea: Try connecting only 1 or two devices with very short cable and proper termination. |-1542c ----- Q P105s -| |-1542c ----- Q P105s ----- Q PD210s -| Something I read from net: maybe it helps...... +---------------------------------------------------- | From comp.os.linux Mon May 31 11:06:43 1993 | From: solca1@urz.unibas.ch | Newsgroups: comp.os.linux | Subject: Adaptec 1542C Giga HDD | Message-ID: <1993May25.154059.42934@urz.unibas.ch> | Date: 25 May 93 15:40:59 MET | | Hi there , | | I have a 486DX2-66 with an Adaptec 1542C . The Hard disk attached is a | IBM 663E12 1Gb . The controoler is SCSI-II like the HDD (f-Scsi-II) | The Problem is that Linux doesn't sense my controller which means that I | cannot boot Linux from the disk purchased from Yggdrasil. | | The controller I haved earlier Adaptex 1542B worked fine. The HDD was a | conner 200Mb . What is the Problem . | If someone have a Idea Please contact me . | | Thanks in advance | Jan. +---------------------------------------------------- +---------------------------------------------------- |From comp.periphs.scsi Mon May 31 11:09:35 1993 |Newsgroups: comp.periphs.scsi,comp.sys.ibm.pc.hardware |From: leop@percy.rain.com (Leo) |Subject: Re: AHA-1542C Bug on external connector???!!!??? |Date: Sat, 29 May 1993 06:07:35 GMT | |>In article <1993May15.092748.19463@arbi.Informatik.Uni-Oldenburg.DE> Andreas.Lemke@arbi.informatik.uni-oldenburg.de (Andreas Lemke) writes: |>>In c't June '93 (German mag) I read about a bug on the 1542C which |>>concerns direct I/O programming of the adapter for devices attached |>>to the ext. connector which yields to writing errors on large data |>>blocks. The ASPI driver (for DOS) supplied by adaptec contains a workaround |>>but third party software (tape backup programms *AND MAYBE LINUX*) |>>do not contain this bug fix. | |I sent the article to Adaptec and they contacted the magazine. It |seems that SCSI-2, and therefore the 1542C, is VERY fussy about the |external cable used. Here are some excerpts from mail I got from the |editor of the magazine yesterday: | |(about Adaptec claim that the problem must be the cable used) |>The man is right! After a lot of messurement, we found out, that the |>AHA-1542C uses very fast rising signals on the REQ-Line witch requires |>kables that meet the SCSI-2 specification even when you use SCSI-1 |>drives. | |(about why it worked with ASPI under DOS, but not UNIX) |>Well, it make sense. Cause ASPI-based Software often uses smal |>block-sizes (below 32 KByte) and the error only occure, if you use |>large blocks. In our next issu (c't 7/93) we will publish an article, |>witch describe exactly, whats going on with the C-type and how you can |>avoid problems with external equipment. +---------------------------------------------------- -- ---- Andreas Klemm ------- /////// andreas@knobel.GUN.de \\\\\\\ private : +49 2137 12609 D-4040 Neuss 21 (Norf), Germany at work : +49 2173 3964 161 Wiechers & Partner Datentechnik GmbH Telefax : +49 2173 3964 222 Abteilung Unix Support, D-4019 Monheim