[Coco] NitrOS9 and 6309 code

[Gene Heskett]

On Friday 31 May 2019 11:52:32 pm L. Curtis Boyle wrote:

> There are gaps. Even in the 200+ range that Gene mentioned in another
> post to the list, there are free entries: Error 222 ($DE)
> Error 225 ($E1)
> Error 255 ($FF)
>
>
> It still think “Bad Module” should be reserved for a damaged module
> (bad length, CRC, Header parity, etc.) vs. for wrong CPU. This would
> make it easier for beginners to know whether they have accidentally
> mixed a perfectly good 6309 module on a 6809 system, vs. trying to
> figure out if a module has gotten corrupted.
>
> My thoughts, anyways.
>
> > On May 31, 2019, at 8:59 PM, Allen Huffman <alsplace at pobox.com> 
wrote:
> >> On May 31, 2019, at 9:52 PM, L. Curtis Boyle
> >> <curtisboyle at sasktel.net> wrote:
> >>
> >> We would have to compare the leftover spots in OS9/6x09 to
> >> OSK/OS9000, etc. I don’t have the latter ones anymore, so you will
> >> have to let me know if there are any holes between 1 to 255. If
> >> not, we will just need to pick one irregardless of later OS9’s.
> >
> > I looked at the current errmsg file They go all the way to 255, so
> > I’ll have to scan through it and see what gaps exist.
> >
> > If nothing else, we find an error code that is not usable on the
> > 6809 version. Later OS-9 added more fields and such in the header,
> > with errors associated with one of those, so it might be fine to
> > hijack something there.
> >
> >>> Why would anything look at this other than the kernel
> >>> (load/chain)?
> >>
> >> Load, link (in case someone modified a module in memory), fork and
> >> chain I would think would be all that is needed. One could put a
> >> check in shellplus too, but it would be redundant.
> >
> > Linking to an executable to use it as a subroutine module, yes? I
> > can see that.
> >
In that case. I am all for using one of those 3. 255 shouldn't be used as  
itsway to easy to generate by accident. But I sort of like 222.

> > 		— A


Cheers, Gene Heskett
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