> Howdy,
> I've had a GVP controller backing up to an Archive Viper for years, and yes 
> it will hang up, but only if you forget to issue the following command to 
> turn off 'disconnect' for the tape drive:
> 	GvpScsiCtrl <unit> DCOFF

Yes, this prevents the lockups, but this isn't a real solution to the
problem, IMHO.  If an SCSI interface (like the gvp) can't use disconnect,
it's about as good as an IDE interface.  I can't have my SCSI bus become
useless while the tape drive is doing something.  I don't know about DATs,
but my QIC drive needs a long time to rewind or retension a tape.
Fortunately, the A3000 SCSI driver has no problems with disconnect, so my
SCSI bus is usable all the time.  Obviously, Commodore had better
programmers than gvp.

I would think the gvp's only have problems under AmigaOS.  They are based
on the same SCSI chip as the A3000 (WDC 33C93), so maybe the new sbic.c
lets even gvp hardware run the way it's supposed to.

  -jm