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From: dan@rna.UUCP (Dan Ts'o)
Newsgroups: net.periphs
Subject: Re: Using a Fujitsu M2333k disk on PDP 11/73
Message-ID: <456@rna.UUCP>
Date: Mon, 9-Dec-85 21:10:09 EST
Article-I.D.: rna.456
Posted: Mon Dec  9 21:10:09 1985
Date-Received: Wed, 11-Dec-85 10:11:53 EST
References: <1558@emory.UUCP>
Reply-To: dan@rna.UUCP (Dan Ts'o)
Distribution: net
Organization: Rockefeller Neurobiology
Lines: 48
Summary: 

In article <1558@emory.UUCP> kim@emory.UUCP (Kim Wallen {Psychology}) writes:
>
>We would like to use a Fujitsu M2333k 337 mbyte drive on our PDP 11/73
>running HCR's UNITY (SYS III based UNIX (TM)) operating system.
>According to our supplier for the disk drive (Cambridge Digital) the
>drive uses an Emulex QD32 controller which emulates a 'du' device.
>HCR does not have a driver for such a combination.  Does anyone out
>there know what a 'du' device is?  Is there anyone using a similar
>combination of machine and controller who could point us to a 
>source for the appropriate driver?  If necessary we are willing to
>go to another UNIX (TM) to get this combination on our machine.

	As someone else mentioned, a DU is a MSCP drive, e.g. RD51, RA81, etc.

	You can either find a driver or use a different disk/controller.

	VENIX-11 (Venturecom), XENIX (SCO), and Ultrix-11 (DEC) all have drivers
for the DU drives in their PDP-11 UNIX's. I would recommend Ultrix-11 (V3.0) of
those. It is very close to 4.2BSD (for the VAX) and is quite well done
(including ETHERNET support, job control, pseudo-tty's, etc.)
	In addition, although 2.9BSD isn't distributed with a DU driver, I have
heard someone on USENET say that they have one.

	There must be other controllers for the Fuji M2333k (actually, I've
never heard of it, It must be new...). If it is an SMD drive, Emulex, Dilog,
Spectralogics, MDB, Plessey all make SMD controllers for SMD drives that look
like RK06/7's or RM03/5's, which your HCR Unity should have a driver for. If its
not SMD, I would suggest getting an SMD drive instead of a ST506 or SCSI drive.
Much faster...

	If high performance is your game, get an SMD drive with a controller
that can do block mode DMA and requires NO sector interleaving. I know
Spectralogics has such controllers, I don't know about the others.

	One last tip for high performance, change your 11/73 15Mhz crystal to
an 18Mhz or 20Mhz crystal. (It is also wise to upgrade an 11/73 YA (KDJ-11AA)
to the 11/73 YB (KDJ-11AB), DEC will do it for $50. It will make the 20Mhz
upgrade easier as well as allow the use of the FPA chip.)

					Cheers,
					Dan Ts'o
					Dept. Neurobiology
					Rockefeller Univ.
					1230 York Ave.
					NY, NY 10021
					212-570-7671
					...cmcl2!rna!dan
					rna!dan@cmcl2.arpa