On 06/01/2008 22:22, Jason T wrote:
On Jan 6, 2008 1:56 PM, John Ball <ball.of.john at
gmail.com> wrote:
ID 4 is not really essential but it is a
preferred address. Just don't forget to set the drive for 512 byte sectors. That is a
must.
Other than a jumper, what is the correct way to do this? I always
thought that a drive simply supported it or not, thus the need to
search out old Toshiba, Sony and Plextor drives.
So far I've tried all the drives in my inventory that booted my Indy
and Indigo2s, but no luck on the Crimson.
Indy and Indigo^2 know (how) to issue the SCSI command which compliant
drives use to change the block size. Indigo, Crimson, etc don't do
that, so you have to jumper the drive. On older Toshiba drives (XM3101
to XM3401; I can't remember if my XM3601 is the same) there are a couple
of pairs of half-moon solder pads, normally bridged by a track, near the
SCSI ID and parity links. Breaking the two bridges sets the drive for
512-byte blocks. Actually, all four permutations mean something; three
of the settings are for 512-byte blocks but with nuances for Sun, SGI,
and Intergraph (IIRC) machines. Most of mine have some fine wires
leading to a 2-section DIP switch :-)
From the old SGI hardware FAQ:
There are two solder pads located on the circuit board at the back
right corner of the drive's aluminum housing when viewed from the top
with the SCSI connector facing away from you. These may or may not be
labeled as '0' & '1', but '0' is on the left and
'1' is on the right
(or closest to the edge of the circuit board). The normal state for
these solder pads from the factory is for both of them to be closed.
With an Exacto Knife or soldering iron (whichever is appropriate for
the desired configuration), cut or solder these pads to match the
entries in the following table:
+++___++++++++__
|power SCSI |
'0' '1' O=CUT/OPEN S=SHORTED/SOLDERED | 01|
---------- |----------------|
S S Toshiba Default (2048 byte block) | |
S O 512 byte blocks | TOP |
O S SGI ( Bootable ) | OF |
O O Sun / Integraph | DRIVE |
| |
| |
| |
|________________|
On some drives, the pads are labelled the other way round; if so, assume
the numbers are correct.
--
Pete Peter Turnbull
Network Manager
University of York