22 Nov
1998
22 Nov
'98
7:38 a.m.
Daniel T. Burrows wrote:
The RD53's were Micropolis 1325's. If you can
find a 1325 you need to
install a jumper in R7 location on the main board to make it look like an
RD53. Also install jumper blocks on W1, W2, and DS3.
Dan
Jerome Fine replies:
Almost correct, as far as I know, but if you do so, you will likely
lose DUA0: if it is not WRITE PROTECTED when you boot.
IF YOU ARE USING TWO HARD DRIVES IN A BA23
BOX, YOU MUST!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! SET THE SECOND
DRIVE AS DS4!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
The last time (and only) I set both drives on DS3, I lost the format
on both and could not recover DU0: - it was on a PDP-11, but
I doubt that the DS3 / DS4 setting requirements are different on
a uVAX II.
Note that the settings on a BA123 with the special I/O distribution
board in slot 13 are very different in that 4 hard drives are allowed
of you don't have any floppies AND all hard drives are set for DS3!
-----Original Message-----
From: Computer Room Internet Cafe <netcafe(a)pirie.mtx.net.au>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Date: Sunday, November 22, 1998 5:36 AM
Subject: 85mb Micropolis in a Microvax II?
>Hi all,
>
>Just pulled a Micropolis 85Mb MFM Hdd out of a genuine, but dead, IBM 286.
>Model is 1335, and is also marked as being an ST506.
>Am I correct in assuming it would work in a Microvax II that presently has
>a single RD53, as a second drive?
>If so, is there deep magic involved in the install?
>I seem to recall seeing something about needing special
>software that is not supplied with the Microvax to put in a
>non DEC drive.
>The Microvax is currently running VMS 5.4
>
>TIA
>
>Geoff Roberts
>Computer Room Internet Cafe
>Port Pirie
>South Australia.
>netcafe(a)pirie.mtx.net.au
>
On a PDP-11, there are DEC formatting programs, but I don't know
what you use on a VAX/VMS? I suggest that you take great care.
I also suggest that you either backup DUA0:
Also, the format for an RD53 on an RQDX2 is incompatible with the
format on an RQDX3.
Sincerely yours,
Jerome Fine
RT-11/TSX-PLUS User/Addict
(Almost no one wants Y2K Patches for any version of RT-11)