[Simh] macro11

[Kevin Handy]

There are a lot of missing features in this macro11 already that are
handled as no-ops, mostly regarding the listing. To do this properly would
require implementing much of the missing listing functionality like paging,
page titles, etc.

I think the first step is to make it not fail on existing code, then worry
about the listing after that.

The parser knows most of the directive names, but is not designed to do
anything about them. For example, it parses the ".page" command, but then
doesn't handle doing anything with it, which is what causes the error
mentioned above. Telling it that it is a no-op for now allows programs to
be compiled, but since there isn't any paging being done in the listing,
there is nothing for it to do right now.

The '.rept 0' thing is obviously a difference in how things are done
differently in the real macro11 and this re-implementation that should be
addressed. I don't know how the code for that works right now, so I don't
know how hard it would be to fix it.

I started playing with this to get example code to run on bare hardware,
since macro11 exists under the actual OS's, so sample code that runs on the
bare hardware would be useful to this, and also to the PiDP11 folks as well
as those with real PDP11's. Is there a repository of such code already?

On Fri, Mar 6, 2020 at 1:10 PM Rhialto <rhialto at falu.nl> wrote:

> On Thu 05 Mar 2020 at 17:10:29 -0700, Kevin Handy wrote:
> > A quick fix to make PAGE a no-op, would be to add a line in assemble.c
> > right after the line
> >    case P_PRINT:
> > and add the line
> >    case P_PAGE:
> >
> > I don't think that much of the listing ops really work anyway.
>
> Indeed. And the exact layout of the listing differs in details from the
> RSX version too. But maybe it makes sense to add a one-time warning for
> this kind of unimplemented but not vital directives?
>
> -Olaf.
> --
> Olaf 'Rhialto' Seibert -- rhialto at falu dot nl
> ___  Anyone who is capable of getting themselves made President should on
> \X/  no account be allowed to do the job.       --Douglas Adams, "THGTTG"
>
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