[Simh] Attach tar to tape device and access it from v7 in simh

[Clem Cole]

You need to convert the foo.tar file to a foo.tap before simh's mag tape
reader will understand it.

If you want to skip that step, attach the foo.tar (or foo.tar.gz) file as a
virtual disk.  The open it as a raw device.

Clem

On Tue, Nov 7, 2017 at 2:58 PM, Will Senn <will.senn at gmail.com> wrote:

> Hi,
>
> I think I may have asked this a couple of years ago, but I am unable to
> find the email conversation, so I'll ask it again from a position of
> experience and greater but still lacking knowledge... here's the background
> - I am running a v7 instance in simh that I am quite pleased with. However,
> I saw somewhere where someone was running some additional software on their
> instance and of course, I just had to have it for my own. Unfortunately,
> it's not clear how they got the software, where it's from, or how they got
> it running. There are hints that the stuff came from early bsd. So... I
> thought I would try getting the bsd source on to my v7 instance to see if I
> could compile it and play around with it. There's a 1bsd.tar.gz in the tuhs
> archive. It being a tar file, I figured I could:
>
> gunzip 1bsd.tar.gz
>
> in simh:
>
> att mt0 1bsd.tar
>
> in v7, which defaults to mt1 for some reason, (not a configured device on
> my system and isn't created by make tm in /dev):
>
> tar vxfb /dev/rmt0 1
> nboot.ini-13> boot rp0
>
> Invalid magtape record length, PC: 002400 (MOV 177776,R0)
>
> or
>
> tar xv0
>
> nboot.ini-13> boot rp0
>
> Invalid magtape record length, PC: 002400 (MOV 177776,R0)
>
> I don't know why the nboot.ini-13> boot rp0 artifact is appearing (prolly
> some buffer flush when the sim aborts)... but of more concern is why I
> can't access the tar. I'm sure it is a gap in my understanding, so I'd
> appreciate some help.
>
> Thanks,
>
> Will
>
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