Re: Eesox and SCSI

On 11 Feb, 22:28, Tim Hill <t...@xxxxxxxxxxxxxx> wrote:
In article
<affe1e88-0a1b-49af-a1f5-3b0ccdbb0...@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
   <a.l...@xxxxxxxxxxx> wrote:

On 10 Feb, 22:58, Tim Hill <t...@xxxxxxxxxxxxxx> wrote:
Well, it had to happen one day; the RISC PC (Eesox fast SCSI 2 Card)
is failing to properly recognise its external (and only) SCSI drive.
The partitions no longer appear on the iconbar and SCSI Director
seems to think I have eight drives, each of which has the following
description: CEAGADE CD##&&'LG
Presuming that the SCSI drive is a SEAGATE (hardly seems likely that it
can be anything else), you've lost data line 4 which is reading as low
(hence S->C and T->D).

Ah.

If you tell us the SCSI ID assigned to your drive (via jumpers/dial on
the drive), that may help to work out where on the cable the problem
lies, but it could be quicker just to perform continunity/resistivity
checks (if you're technical) and/or cleaning contacts and, if
necessary, substituting other devices/terminators etc. ID 4 would be
an unusual choice for the only device on a bus, and perhaps you could
learn something by setting the ID to something above 4 before issuing
*Devices, and then trying again with it below 4.

For what it's worth, if I'm right in suspecting your cabling to be 50-
way single-ended IDC cable (physically similarly to the type of cable
used for floppy drives), it may be useful to know that the terminator
pulls the data line high and that drivers in the card/device are 'open
collector', meaning that they can only pull it low.... so either a
driver is always on, or more likely (IMHO) the terminator isn't
pulling it high for some reason, /if/ the fault lies on the bus rather
than the SCSI card itself. Much more information can be found at
http://www.t10.org/ftp/t10/drafts/s2/s2-r10l.pdf

Adrian
.

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