[pups] CDROM drives and PDP-11s

[pups] CDROM drives and PDP-11s

[Gregg C Levine]

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Hello from Gregg C Levine
Here's the problem. I have several CDs containing programs, and such
like from Tim Shoppa. Two of them say they contain portions which are
readable only by a CDROM Drive attached to a PDP-11. One of them is
split in half. Half is readable on either of the two computers here,
the other half, is in a format that's native to the PDP-11. The other
is all in that proprietary format. So, has anyone managed to get them
read to their machines? Or failing that to the appropriate simulators,
or even emulators? Any suggestions?
-------------------
Gregg C Levine hansolofalcon at worldnet.att.net
------------------------------------------------------------
"The Force will be with you...Always." Obi-Wan Kenobi
"Use the Force, Luke."  Obi-Wan Kenobi
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(This company dedicates this E-Mail to Master Yoda )

[pups] CDROM drives and PDP-11s

[Ian King]

John Wilson's PUTR program might be jut the tool - http://www.dbit.com.  I'm
guessing it might be ODS-2; worst case, I have an InfoServer that can read
that, and a TK-50 I could dump it to...  :-)  -- Ian
----- Original Message -----
From: "Gregg C Levine" <hansolofalcon@worldnet.att.net>
To: <pups at minnie.tuhs.org>
Sent: Wednesday, February 26, 2003 11:46 PM
Subject: [pups] CDROM drives and PDP-11s


Hello from Gregg C Levine
Here's the problem. I have several CDs containing programs, and such
like from Tim Shoppa. Two of them say they contain portions which are
readable only by a CDROM Drive attached to a PDP-11. One of them is
split in half. Half is readable on either of the two computers here,
the other half, is in a format that's native to the PDP-11. The other
is all in that proprietary format. So, has anyone managed to get them
read to their machines? Or failing that to the appropriate simulators,
or even emulators? Any suggestions?
-------------------
Gregg C Levine hansolofalcon at worldnet.att.net
------------------------------------------------------------
"The Force will be with you...Always." Obi-Wan Kenobi
"Use the Force, Luke." Obi-Wan Kenobi
(This company dedicates this E-Mail to General Obi-Wan Kenobi )
(This company dedicates this E-Mail to Master Yoda )




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[pups] CDROM drives and PDP-11s

[Carl Lowenstein]

> From: "Ian King" <iking at killthewabbit.org>
> To: "Gregg C Levine" <hansolofalcon at worldnet.att.net>, <pups at minnie.tuhs.org>
> Subject: Re: [pups] CDROM drives and PDP-11s
> Date: Thu, 27 Feb 2003 08:52:54 -0800
> 
> John Wilson's PUTR program might be jut the tool - http://www.dbit.com.  I'm
> guessing it might be ODS-2; worst case, I have an InfoServer that can read
> that, and a TK-50 I could dump it to...  :-)  -- Ian
> ----- Original Message -----
> From: "Gregg C Levine" <hansolofalcon at worldnet.att.net>
> To: <pups at minnie.tuhs.org>
> Sent: Wednesday, February 26, 2003 11:46 PM
> Subject: [pups] CDROM drives and PDP-11s
> 
> Hello from Gregg C Levine
> Here's the problem. I have several CDs containing programs, and such
> like from Tim Shoppa. Two of them say they contain portions which are
> readable only by a CDROM Drive attached to a PDP-11. One of them is
> split in half. Half is readable on either of the two computers here,
> the other half, is in a format that's native to the PDP-11. The other
> is all in that proprietary format. So, has anyone managed to get them
> read to their machines? Or failing that to the appropriate simulators,
> or even emulators? Any suggestions?

When I look at "readme.txt" on my RT11 disk from Tim Shoppa I find the
following paragraph:

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
The second part of the disk is seven RT-11 partitions.  Each is a 65536
block RT-11 device that is accessible on a PDP-11 machine with a SCSI
host adapter and a SCSI CD-ROM drive.  They appear as RT-11
DU partitions 13 through 19.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 

The implication to me is that any of these partitions could be copied
to a 32MB file on a hard drive, and then attached to the PDP11 simulator
of your choice and read as an RT-11 drive.

The tool I would use for copying the partition is dd(1).

	dd if=/mnt/cdrom bs=32M skip=13 count=1 of=dskimg

This requires that you have 32MB available RAM for the dd "copy in"
and 32MB available disk space for the dd "copy out".  You could
trade off a smaller "bs" for a more complicated calculation of the "skip".
I suppose I am making the assumption that this work is being done on
a Unix-like system, which seems reasonable in the PUPS context.

    carl
-- 
    carl lowenstein         marine physical lab     u.c. san diego
                                                 clowenst at ucsd.edu