Date   : Fri, 25 May 2012 10:46:03 +0200 (BST)
From   : johan@... (Johan Heuseveldt)
Subject: Setting jumpers SCSI IDs

Hi all,

It was suggested to me to put the following on the mailing list.
It's about setting up the jumpers for a SCSI ID on a hard drive.


  For years I have a few SCSI hard drives which could not be
  recognised by RISC OS or the RISC OS machine freezes up.


Saterday May 12 this year I was at the

 Dutch RISC OS eXperience 2012
 
show, visit the second hand market, and obtained a SCSI drive;
Quantum ProDrive LPS, with two small Apple labels on it,
  in black : EPROM <circled C> 1990 <Apple logo)
  in red   : <Apple logo> 80

This could be a very useful replacement drive for the MDFS file server!


Apart from some small IDE drives (< 512 MB, having RISC OS 3.10 in mind
here) I also became owner of a SCSI TAPE Drive, and an IBM hard drive.


I didn't have any success with the Quantum on the MDFS, so I decided to
do a search with Google. Although a small lable on the drive explicitly
shows '84S', I only could find a 80S, assuming this is the model. After
a while I found various jumper settings, and got very surprised: The way
a jumper affected the binary number for the SCSI ID was the other way
than I was used to:

  putting a jumper on makes it a value of '1',
  and getting it off makes it '0'

The jumper list started with all jumpers off, and says SCSI ID = 0


When I tried this up-side-down scheme - well, for me - MDFS fully recognised
the drive, and showed:

       QUANTUM LP80S 980809404 Ver 3.3

The small lable with '84S' has beneath it in a smaller print: 980-80-9404.
It made my day!


I did an Init Drive for both partitions - sizes are fixed, and then verified
both of them. All went well and smoothly.


  As an side effect of this I looked up the drives I unsuccessfully tried
  on RISC OS, and these too have the 'alternative' scheme. And yes, now
  they were recognised on RISC OS, (2 Viking models, both 4GB)


The IBM hard drive was labeled with 'MODEL WDS-380 80MB' and quickly
found with Google. It's a 3.5 inch drive in full height! Again, the
jumpers need the new approach. But this time, MDFS could not deal with
this drive. But perhaps it's suitable for the Acorn FileStore!


  The Tape drive was clearly labeled: TEAC  MT-2ST/45S2  27-U. No luck
  so far on MDFS. Type of Tape Cassette is still unclear.


Well, FWIIW


Greetings,
Johan

-- 
Johan Heuseveldt <johan@...              >
  aka  waarland

  The best place is a Riscy place

The English may not like music, but they absolutely
love the noise it makes. - Sir Thomas Beecham