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From: jfieber@grendel.csc.smith.edu (John Fieber)
Message-Id: <199507050309.XAA15297@grendel.csc.smith.edu>
Subject: Re: mt grief?
To: jmb@kryten.Atinc.COM (Jonathan M. Bresler)
Date: Tue, 4 Jul 1995 23:09:48 -0400 (EDT)
Cc: karl@bagpuss.demon.co.uk, spaz@u.washington.edu,
        FreeBSD-hackers@freefall.cdrom.com
In-Reply-To: <Pine.3.89.9507041921.A28859-0100000@kryten.atinc.com> from "Jonathan M. Bresler" at Jul 4, 95 07:46:32 pm
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Jonathan M. Bresler writes:
> > > 	john,  use 'mt -f /dev/rst0 fsf 1' to awaken the mt/kernel code.  
> > > every time i boot, i get error from the drive till i do this.  then 'mt 
> > > -f /dev/rst0 rewind' and the thing works like a champ ;)
> > 
> > interesting!  what kind of drive are you using?
> 
> 	Archive Viper 150.  a known rogue device.  see st.c 
> 	i have not ktrace'd it.  dont know how to map the addresses 
> provided by ktrace into the proc's data space.....yet.

Interesting, I have an Archive Viper 150 and no such jiggery
pokery is required to make it work.  Maybe this is a controller
problem?? I'm afraid I missed the beginning of the discussion.
I'm using:

 aha0: AHA-1542CF-V0.1, enabling mailbox, enabling residuals
 aha0: reading board settings, dma=5 int=11  (bus speed defaulted)
  .
  .
  .
 (aha0:2:0): "ARCHIVE VIPER 150  21247 -005" type 1 removable SCSI 1
 st0(aha0:2:0): Sequential-Access st0: Archive  Viper 150 is a known rogue
 density code 0x0,  drive empty

Be sure you have the density set correctly.  I had great
difficulty with a couple second-hand tapes until I discovered
they were QIC 120 rather than the QIC 150 I had assumed.  The
drive can handle them just fine, once told what they are.  :)

-john

=== jfieber@cs.smith.edu ========== Come up and be a kite!  --K. Bush ===