[pups] RE: Unix Archive mirror site offer

[pups] RE: Unix Archive mirror site offer

[Fred N. van Kempen]

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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 at 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:
> > 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
> 


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From: Martijn van Buul <pino@dohd.org>
To: pups at minnie.cs.adfa.edu.au
Subject: Re: [pups] RE: Unix Archive mirror site offer
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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 at 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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Date: Fri, 16 Feb 2001 10:15:20 +0100 (CET)
Subject: Re: [pups] RE: Unix Archive mirror site offer
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On 16 Feb, Martijn van Buul wrote:

[third party disks on RQDX}
> 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.
Could this be placed in the archive? It would be nice to have this
public available.

> Having a couple of 5.25" HD diskdrives really helps. Some of these 
> drives (the older, the better ;) can be used as RX33 drive
I connected a generic Mitzumi 5.25" FDD to the RQDX3 in my MicroVAX III
and it just worked. Even booting from it was no problem.
-- 



tschüß,
         Jochen

Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/


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Date: Fri, 16 Feb 2001 12:11:33 +0100 (CET)
Subject: [pups] What is a 21-21858 chip?
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Hi.

I have two PDP11/73 CPUs (M8192). On one module is the 40 pin socket
empty. On the other module is a 40 pin Chip labeld 21-21858 in the
socket. What chip is that?
-- 



tschüß,
         Jochen

Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/


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Subject: Re: [pups] What is a 21-21858 chip?
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FP11 floating point processor (I think)



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Subject: Re: [pups] What is a 21-21858 chip?
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On 16 Feb, robin.birch at postoffice.co.uk wrote:

> FP11 floating point processor (I think)
I thought the FPU is part of the J11 chip? Or is this extra chip just
faster?
-- 



tschüß,
         Jochen

Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/