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From: Lars Brinkhoff <lars@nocrew.org>
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	(Warner Losh's message of "Mon, 22 Aug 2022 10:27:31 -0600")
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Subject: [TUHS] Re: Extracting files from various old dump/restore tapes
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Warner Losh wrote:
> So 60011 is OFS_MAGIC and 60012 is NFS_MAGIC. Both of these are
> variants on UFS, but really old. And given they are at different
> offsets, you'll likely need to reverse engineer the offsets used for
> the platform's dinode.

So anyway, it seems my best bet would be getting an old "restore" and
hack it till it runs.

Part of the problem is that there are hundreds of these images, so it
would be a lot of work to examine them individually in emulated systems.
A good first start to examine the content would be to just list the file
names.

> Without more specific data it's hard to know if there's an extant
> binary that can be run in emulation to read these tapes.

The tapes are from MIT's "Tapes of Tech Square" collection.  Likely
candidates include PDP-11 V7, 4.x BSD on VAX, and Sun workstations.  I
suppose the latter would use the big endian format.

There are also many variations of the tar and cpio formats, but I'm on
firmer ground there.