15 Feb
2001
15 Feb
'01
3:01 a.m.
Warren,
Good news so far. I did some work on VTserver 2.0, and added the uODT code
so it
uploads the PDP-11 boot code to the machine and gets it going. That works
fine..
"copy" gets loaded, and I can transfer stuff from and to the machine's
RX50
and
RD51 units.
My biggest worry next, of course, is using an emulator to emulate my machine
(which
is a MicroPDP-11/23, by the way) and its disks, and build a working set of
file
systems. Those I can then transfer to the raw disk.
When playing, I noticed that the RD51 is a plain Seagate ST412 MFM drive...
did anyone
try to use other MFM disks with the RQDX series controllers? I can probably
get some
very cheap ST251 40MB drives.. ;)
--fred
-----Original Message-----
From: Warren Toomey [mailto:wkt@henry.cs.adfa.edu.au]
Sent: dinsdag 13 februari 2001 2:22
To: Fred N. van Kempen
Subject: Re: Unix Archive mirror site offer
In article by Fred N. van Kempen:
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Here's a promise... if I can get my MicroVAX
3400 back up
(on Ultrix 4.4),
I'll run the archive on that box...
(pups.microwalt.net or
tuhs.microwalt.net)
so all the old stuff is hosted on old stuff... otherwise
it's going to be a
Sun SPARCstation Classic- also an old box, but
not quite as old :)
Excellent. I believe Caldera have bought the rights to UNIX
from SCO, and
I"ve heard rumours that they might drop the ``click on the
license'' thing,
so if that happens we can make the archive available with no
passwords.
Also: I am working with Bill Grunshannon and
Steven Schultz
on getting my
own
MicroPDP-11/23 back up... we need to include your VTserver
stuff into the
Ultrix-11 source tree, recompile parts, move into
binary
tree, and create a
new tape which I can then load. Bill has a
working 11/73
with Ultrix-11 on
it,
and also has an 11/93 with same.
My new VTserver can load in and write entire disk images now,
so it should
be usable to install an Ultrix disk image.
http://minnie.cs.adfa.edu.au/Vtserver.
I'll be back at work tomorrow or the nxet day.
Cheers,
Warren
From Martijn van Buul <pino(a)dohd.org> Fri Feb 16
18:11:02 2001
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Date: Fri, 16 Feb 2001 09:11:02 +0100
From: Martijn van Buul <pino(a)dohd.org>
To: pups(a)minnie.cs.adfa.edu.au
Subject: Re: [pups] RE: Unix Archive mirror site offer
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Fred.van.Kempen(a)microwalt.nl on Thu, Feb 15, 2001 at 04:01:45AM +0100
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Fred N. van Kempen wrote:
When playing, I noticed that the RD51 is a plain
Seagate ST412 MFM drive...
did anyone try to use other MFM disks with the RQDX series controllers? I
can probably get some very cheap ST251 40MB drives.. ;)
I've done exactly the same thing (but it only was an ST225, AKA RD31) on
an RQDX3 controller. You need the XXDP 2.5 diagnostic kit for that. Having
a couple of 5.25" HD diskdrives really helps. Some of these drives (the
older, the better ;) can be used as RX33 drive, which greatly reduces the
problem of creating a XXDP bootdisk with the needed utilities, since you
can write these disks in a (second :) 5.25" drive on a standard PC.
Finding a supply of 1.2 MB 5.25" disks can be a bigger problem - I'm
very happy with my newly found pack of *fresh* disks.
I may still have such a diskimage floating around somewhere (Yup, I seem
to have). The basic idea is to low-level format the MFM drive, and make it
look like a genuine DEC drive. This is a lot easier if the drives you
want to use were also sold as DEC drives (which is the case with the
ST251 - it's also known as the RD32). If not, you'll have to provide
a lot more information about the drive - never really tried that.
This said, I sucessfully low-levelled a 21MB Miniscribe (with the same
CHS-layout as a ST225) using the RD31 parameters.
--
Martijn van Buul - Pino(a)dohd.org - http://www.stack.nl/~martijnb/
Geek code: G-- - Visit OuterSpace: mud.stack.nl 3333
Kees J. Bot: The sum of CPU power and user brain power is a constant.
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