Subject: small update to DHV-11 driver (#61)
Index:	sys/pdpuba/dhv.c 2.11BSD

Description:
	The DELAY macro was replaced with a call to the "delay()" routine
	(in pdp/mch_xxxx.s) because the macro generated a rather excessive
	volume of code AND because this driver was the last module to
	use it.  A later patch removes the macro altogether from 
	machparam.h.

	Too, there was an unused variable present which was removed
	(two bytes is two bytes after all).

Repeat-By:
	Examine the code.

Fix:
	Apply the patch below (this assumes previous postings which 
	promoted the DHV driver from the OTHERS catagory to "supported")
	have been applied).  No need to recompile the kernel unless
	a DHV-11 is present in the system
------------------------------------------------------------------------
*** /sys/pdpuba/dhv.c.old	Thu Dec 26 10:13:41 1991
--- /sys/pdpuba/dhv.c	Thu Jul  2 22:53:43 1992
***************
*** 76,82 ****
  struct	tty dhv_tty[NDHVLINE];
  int	ndhv = NDHVLINE;
  int	dhv_ie[NDHV];
- int	dhvtsize = sizeof(struct tty);
  int	dhvact;				/* mask of active dhv's */
  int	dhv_rcnt[16];
  int	dhvstart(), ttrstrt();
--- 76,81 ----
***************
*** 546,552 ****
  	else
  	{
  	    addr->dhvlcr &= ~DHV_LC_OAUTOF;
! 	    DELAY(25); /* see the dhv manual, sec 3.3.6 */
  	    addr->dhvlcr2 |= DHV_LC2_TXEN;
  	}
  	splx(s);
--- 545,551 ----
  	else
  	{
  	    addr->dhvlcr &= ~DHV_LC_OAUTOF;
! 	    delay(25L); /* see the dhv manual, sec 3.3.6 */
  	    addr->dhvlcr2 |= DHV_LC2_TXEN;
  	}
  	splx(s);
***************
*** 721,727 ****
  		unit = UNIT(tp->t_dev);
  		addr->dhvcsrl = DHV_SELECT(unit) | dhv_ie[unit>>3];
  		addr->dhvlcr |= DHV_LC_TXABORT;
! 		DELAY(25); /* see the dhv manual, sec 3.3.6 */
  		addr->dhvlcr2 |= DHV_LC2_TXEN;
  		if ((tp->t_state&TS_TTSTOP)==0)
  			tp->t_state |= TS_FLUSH;
--- 720,726 ----
  		unit = UNIT(tp->t_dev);
  		addr->dhvcsrl = DHV_SELECT(unit) | dhv_ie[unit>>3];
  		addr->dhvlcr |= DHV_LC_TXABORT;
! 		delay(25L); /* see the dhv manual, sec 3.3.6 */
  		addr->dhvlcr2 |= DHV_LC2_TXEN;
  		if ((tp->t_state&TS_TTSTOP)==0)
  			tp->t_state |= TS_FLUSH;