My original question:
> The CD-ROM drive on our DEC 3000 (DU4.0B) has died and I'd like to
> replace with a non DEC SCSI CD_ROM drive. Will DU recognize the new drive or
>do I need to do a MAKEDEV ?
Most people said use the same SCSI ID and plug it in and you should be OK,
so I stuck an old SUN (:-)) CDROM on the end of the scsi bus and it worked
fine.
Thanks to Tom, Eric, jason and alan. They mentioned a 512/1024 byte
sector issue so I include their full replies
--------------------------------
Dr. Tom Blinn
If you jumper the drive to be at the same address, you may get lucky and
it may just work.
But be careful out there.. There are MANY models of SCSI CDROM drives on
the market, and some of them will NOT work correctly with V4.0B. You'd
have more likely success with V4.0D (you are going to update anyway before the
end of the year, right?), provided the hardware actually works correctly (and
I've seen more than one brand of SCSI CDROM drive that does NOT work reliably
no matter what you do).
By the way, we've often used Toshiba as a supplier with good results, but
I can't say if they currently market anything that will work.
--------------------
Eric Gatenby
If you give it the same SCSI ID, you should not have to remake the
devices.
Just make sure the new SCSI CDROM has a 1024 <-> 512 byte block size
jumper
-------------------------
alan_at_nabeth.cxo.dec.com
Sometime in the V4.0 stream the restriction that CDROM devices
always had to use 512 byte sectors was lifted. I don't think
it was in V4.0B. That may limit your choices some. On the
versions that still require 512 bytes sectors, failure to use
a device that has the feature may completely prevent the device
from being usable; MAKEDEV or not.
Odds are, if the CAM driver recognizes it when the system boots
then scsimgr will create the special files for it.
-------------------------------
jason andrade
it should recognise/use it assuming:
o you use the same scsi id
o you have a compatible cdrom e.g one with the right blocksize set.
Received on Sun Jul 25 1999 - 20:41:20 NZST