Subject: Re: SCSI CD changers supported?
To: None <current-users@NetBSD.ORG>
From: Christoph Badura <email@example.com>
Date: 09/13/1996 01:52:00
Tom I Helbekkmo writes:
>OK, so I have a drive that claims to support disconnect/reconnect, but
>doesn't seem to do it. I've tried both settings of the switch, in
>case the manual was wrong (I finally got hold of a copy), and I've
>even opened up the thing and checked that the switch itself is OK.
You know, that is odd behaviour. If there's a switch to enable
disconnect/reconnect and the manual documents it, I'd say it is
supposed to work.
You did power-cycle the device after flipping the switch, didn't you?
Just to be sure.
>How can I find out what actually happens in there?
If you have, say, a NCR 53C8xx chip, you could hack the driver to log
disconnects off the drive. With a BusLogic controller you would have
to resort on a SCSI bus analyser.
>What's the best
>way to figure out exactly how the drive handles IDENTIFY messages, and
>thus whether this drive (built in 1990) correctly follows SCSI-I?
Is the manual you have the "Technical Reference Manual"? If so, you
might find something on the SCSI implementation.
Frankly, a drive built in 1990 shouldn't have any problem with
disconnect/reconnect and IDENTIFY messages. They have been in SCSI-1
since 1986 and SCSI-2 was well on it's way in 1990.
>Anyone have a SCSI utility that can generate commands and show results?
FreeBSD's SCSI cmd?
If you have a AHA1542* controller accessible you could try Roy Neese's
scsi utilities. Last time I checked, which was quite a while ago,
they were on ftp.psg.com in pub/adatec IIRC. The program is
scsicmd.exe, a very useful program IMHO.
Christoph Badura firstname.lastname@example.org
You don't need to quote my .signature. Everyone has seen it by now.
Besides, it doesn't add anything to the current thread.