A few system mods from Melbourne:

These relate to VM UNIX from UCB, but nothing here is very dependant on
that system, and it should all fit just about anywhere

dr11.h
dr11.c		a driver for doing development work on a dr11
		(makes it possible for user level progs to (almost)
		work the dr11 themselves - can test new hardware easily)

lock.c		a trivial process lockout mechanism, implemented as a driver

tty.h
tty.c
prim.c
dz.c		the Melbourne tty driver (has just about everything)
		(see ../man/man4/tty.4)
		dz.c is only so you can see what will need to be done
		to your interface routines (it isn't much) - this won't
		work on anything but VM UNIX

errlog.h
hperrs.h
memerr.h
hp.c
errlog.c
machdep.c
		implements and uses /dev/errlog - for recording device
		errors on the VAX (will need some work on other machines)

Finally: all this is for V7/32V only - I wouldn't expect it to be
easy to make it work on V6.
The tty driver is rather larger than standard, you may need to
remove some bits to make it fit gracefully on a pdp11

		Robert Elz
		Comp Sci
		Melb Uni
