[TUHS] Fwd: Choice of Unix for 11/03 and 11/23+ Systems

[devin davison]

Nice find. What does the label on the big hard drive read? I have found a
similar drive with a worn label and i am trying to see if i can find a
system to connect it to.

On Mon, Sep 21, 2020, 3:38 PM Noel Chiappa <jnc at mercury.lcs.mit.edu> wrote:

>     > From: Paul Riley
>
>     > Using LSX on the 11/03... Will LSX handle cards with multiple serial
>     > ports?
>
> Ah, I just read this carefully; LSX only supports a single user at a time,
> so
> there's no use to multiple serial lines? (But see below.) (I thought Heinz'
> reply message to this referred to Mini-Unix, which does suppport multiple
> users, but on reading it again I see it does not.)
>
>
> If you want multiple users on an -11/03, Mini-Unix would be an option; it
> doesn't support the -11/03 'out of the box', but looking at it, it
> shouldn't
> be too hard. (Heinz mentioned that it had been done before.) Change all
> cases
> of 'mov xx, PS' in mch.s:
>
>
> https://minnie.tuhs.org//cgi-bin/utree.pl?file=Mini-Unix/usr/sys/mxsys/mch.s
>
> to 'MTPS xx' (PS access needs a special instructtion in the /03); that
> might
> be all you need to do. (Installing a KEV11-A, so you can avoid using the
> instruction emulation package for EIS instructions would be nice, but
> apparently isn't required.)
>
>
> If Mini-Unix supports multiple users, it ought to be possible to do the
> same
> with LSX. (I'm not sure what the rationale was for making LSX single-user:
> perhaps the RX was too slow; perhaps there was no need in their use case;
> etc.)
>
> But it would probably be more work than going the Mini-Unix route; e.g.
> to start with, init only supports a single user:
>
>   https://minnie.tuhs.org//cgi-bin/utree.pl?file=LSX/src/init.c
>
> and the tty driver:
>
>   https://minnie.tuhs.org//cgi-bin/utree.pl?file=LSX/sys/tv.c
>
> only supports a single line. One could cross-port the needed 'stuff' from
> Mini-Unix, but it'd probably be easier to do the Mini-Unix -11/03
> conversion.
>
>            Noel
>
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