🚀 go-pugleaf

In article <1992Nov5.084418.22570@hellgate.utah.edu> reading%uintah.cs.utah.
edu@cs.utah.edu (Dan Reading) writes:



>> I have a fujitsu M2266SA I'm putting on a DECStation 5000/240.  The
>> drive does not spin up if attached to the DEC at power up, and the
>> first first READ/WRITE I/O operation fails. After that it works fine.
>> I'm sure this has something to do with the jumper settings on the
>> drive. Maybe someone else can inform of the correct settings before I
>> have to set down and read the manual.

>> thanks in advance,
>> Dan R.
>> reading@cs.utah.edu

Dan,

  I would suspect that you've got a jumper setting problem. This is not all
to uncommon with some SCSI drives. The most likely culprit is the switch which
is hardwiring Synchronous SCSI. The ANSI SCSI-2 spec states that a synchronous
device be able to "negotiate" synchronous. 

  The console code in the SCSI prom on the DEC platforms addresses the drive as
an asynchronous device. When the operating system boots, it will negotiate with
the devices to see if they can handle synchronous. If your disk drive is hard-
wired as a synchronous device, it will fail at console level.

  You may want to try the following:


>>> Excerpted from a previous post by:
>>> From: grunwald@foobar.colorado.edu (Dirk Grunwald)
>>> Date: 16 Sep 91 21:55:46 GMT


   Switch Bank CHN2:
	   - open switch 1-2	(make it be SCSI-1/CCS)
	   - open switch 11-12	(turn parity off)
	   - open switch 15-16	(let host initiate SCSI synch mode)

   For some hosts, you may need to also disable the readahead cache
   (CHN9), but it seems to work on the DECstation. Bulk transfers (using
   dd & 32K blocks) are 1.2Mb/s. The Wren V gets about the same, maybe a
   little less. The Fuji has 14.5ms seek time.

>>> End of excerpt

  I make no warranties about the above information. You may want to contact
the folks who sold you the disk drive and ask them about it. But, this has
worked for a number of folks.

I hope that helps.

				Thanx,
				  AJ


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