On Sat, 23 Nov 1996, Lennart Augustsson wrote:
> > > What has happened to the NCR SCSI driver?  I did a sup
> > > to get the latest "improved" version of the NCR driver,
> > > and now the write speed has gone from 3.5MB/s to 1.4MB/s.
> > > Reading is still at about 5.5MB/s.
> > 
> > Oh dear. What sort of PC are you on, and what's the rotational
> > speed of your hard drive?

I don't know if this will make any difference, but there have been some
minor patches to the FreeBSD's ncr.c since I originally submitted the PR
with the updated driver... You might try them out and see if they help
anything: 

--- /usr/src/sys/dev/pci/ncr.c	Thu Nov 21 06:20:17 1996
+++ ncr.c	Fri Nov 22 22:53:50 1996
@@ -3501,8 +3501,8 @@
 
 	np->maxwide = 0;
 	np->rv_scntl3 = 0x13;	/* default: 40MHz clock */
-	np->ns_sync = 25;
-	np->ns_async = 50;
+	np->ns_sync   = 25;	/* XXX no support for Fast-20, yet */
+	np->ns_async  = 50;
 
 	/*
 	**	Get the frequency of the chip's clock.
@@ -5172,8 +5172,8 @@
 	**	Never test for an error condition you don't know how to handle.
 	*/
 
-	dstat = INB (nc_dstat);
-	sist  = INW (nc_sist) ;
+	dstat = (istat & DIP) ? INB (nc_dstat) : 0;
+	sist  = (istat & SIP) ? INW (nc_sist)  : 0;
 	np->profile.num_int++;
 
 	if (DEBUG_FLAGS & DEBUG_TINY)
@@ -7058,8 +7058,6 @@
 		}
 	}
 
-	np->ns_sync   = 25;
-	np->ns_async  = 50;
 	np->rv_scntl3 = ((scntl3 & 0x7) << 4) -0x20 + (scntl3 & 0x7);
 
 	if (bootverbose) {


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