From:	SMTP%"hoffman@xdelta.enet.dec.com"  8-DEC-1994 17:32:50.51
To:	EVERHART
CC:	
Subj:	Re: RD54 in place of RD53

From: hoffman@xdelta.enet.dec.com (Stephen Hoffman)
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Subject: Re: RD54 in place of RD53
Date: 8 Dec 1994 21:32:18 GMT
Organization: Digital Equipment Corporation
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Reply-To: hoffman@xdelta.enet.dec.com (Stephen Hoffman)
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In article <8DEC199410374239@hearts.aces.com>, gavron@hearts.aces.com (Ehud Gavron) writes:
|>In article <786787862snz@brendata.demon.co.uk>, steveh@brendata.demon.co.uk writes...
|># 
|>#A customer has supplied the souirce for a software project on an RD54,
|>#so we dusted off the old MicroVAX II, removed the RD53 and put the RD54
|>#in its place.  No joy, put back the RD53 and it's fine.
|># 
|>#Are there any switches to set on an RQDX3 when exchanging an RD54 for an RD53?
|>
|>No, but if your controller can't handle it, it's probably an RQDX2 or lower,
|>which can't do RD53s.  You need an RQDX3 to do RD54s.
|>
|>#Thanks
|>>#-- 
|>>#Steve J Hanselman                      We have a vacancy for a VMS/UNIX
|>>#Steveh@brendata.demon.co.uk       |    technical consultant.  Could this
|>>#+44 (0268) 490280                 |    be you?
|>>#Laindon, Essex.  UK
|>># 
|>
|>
|>	Ehud
|>
|>--
|>Ehud Gavron	(EG76)
|>gavron@Hearts.ACES.COM
|>

   I'd ask the customer to provide the software on a different media.

   Follow anti-static procedures and/or contact your hardware service
   organization *before* performing the following.  I *think* the
   following is correct, *but* there *may* be errors -- please don't
   call me (or Digital) if you smoke your system, scrozzle your drive,
   or somehow damage your body.

   The RQDX3 -- the only RQDX controller that can run an RD54 -- does
   indeed have a jumper that must be moved to configure it for the RD54. 
   It's labeled W23.  If it's a rev C controller, jumper pins J1 and J2.
   If it's rev D, jumper pins 1 and 2, and you may also need to jumper
   pins 3 and 4.

   The RD54 drive select (which comes into play in the BA23 enclosure, and
   doesn't really come into play in a BA123) should be on pins 2 and 3 (if
   the pins are labeled DS1234) or on pins 3 to c (if the pins are labeled
   1C23C4).  This is drive select 2, unit 0.

   If the drive is labeled as a Maxtor XT2190, the RQDX3 must be rev D. 

   If using a BA23, you should try to use the six-hole front panel as it
   reduces the changes of running into a floating drive select or write
   protect (WP) should you choose the wrong drive select (DS) on the RD54.
   (Stay away from DS0 and DS1, and if you have a four-button front panel,
   stay away from DS3.)

       DS0: WP 2, Fixed disk unit 0
       DS1: WP 3, Fixed disk unit 1
       DS2: WP 0, Fixed disk unit 0
       DS3: WP 1, Fixed disk unit 1

   If the controller ROMs are different versions or if the drive is
   out of a 2000-series box, you may end up having to reformat the
   RD54 drive to access it -- and this would (obviously) defeat the
   whole project.


  ------------------------------ Opinionative -------------------------------
   Stephen Hoffman, NREMT-I, N1THN               hoffman@xdelta.enet.dec.com
        OpenVMS Engineering, Digital Equipment Corporation, Nashua NH
                            "Novus Ordo Seclorum"