[HECnet] RT-11 filesystems, was Re: DECnet-RT?

[Clem Cole]

Caps-11 sounds possible.  I’ve forgotten.  For the small systems (11/20,
15, 05 and the numerous LSI-11s), we had all of CAPS-11, RT-11, DOS-11 and
RSX in those days on different machines for simple RT tasks.    Although
once we started getting 11/40s, 45s and eventually 34s it became almost all
Unix and used dedicated micros for the RT portions.

On Tue, Mar 31, 2020 at 7:49 PM Paul Koning <paulkoning at comcast.net> wrote:

>
>
> > On Mar 31, 2020, at 5:45 PM, Clem Cole <clemc at ccc.com> wrote:
> >
> > I've forgotten to be honest -- IIRC, no formatting was needed like a
> traditional tape drive.   But it is possible we may have had a program to
> do the formatting and I've just forgotten it. I do remember that it was a
> very simple, saturation scheme. We had a scope on the read electronics of
> the TA11 and decoded it all.   NRZ style, 8-bit bytes, no parity, fixed
> blocks with a prefix and suffix - serial encoding (unlike a 7/9-track) -
> which is why the capacity is so low.
>
> Was it really RT-11?  I don't remember that it had TA11 support, and given
> that it's like a magtape, not block addressable, it's hard to see how it
> could be the system device.
>
> DEC had an early software package called CAPS-11.  I know nothing about it
> other than the name and the fact that it was there to support the TA-11.
>
>         paul
>
>
> --
Sent from a handheld expect more typos than usual
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