tu16 ioctl and 2.9bsd

[keith at reed.UUCP]

I am wondering if other people out there are running 2.9bsd
and have a tu16 tape drive.  We installed 2.9 with HT_IOCTL
defined and could not use any device except the raw 1600 bpi
one.  All others caused the system to crash.  
After mucking about with the driver for several days,
in desperation, we removed the definition of HT_IOCTL.  This
cured our problem but left me wondering; what caused the
problem in the first place?  The non-functioning of the
800 bpi device is especially mysterious, all that that does
is toggle a bit on the tu2 controller.  For other reasons,
it would be nice to have IOCTL on the tape drive.  Has
anyone surmounted this problem?
			keith packard
			reed college
			...tektronix!reed!keith