Re: [colorforth] @+

["Ray St. Marie" <ray.stmarie@xxxxxxxxx>]

Hi Charley,
Ray here...

Nicely done! Can't wait to try your code.
I just got done reading your site ( thanks for the link, btw --
updating is going on now and my site will change dramatically, very
soon) ... and you did a nice job on the html-converter in gforth.
Can't wait to try that as well.

Do you mind if I link to your page? I wanna show off your code! :)

I think you had a good idea, moving from EDX to EBX. The code looks great!

Ray

On 2/1/06, Charles Shattuck <cshattuck@xxxxxxxxxxxx> wrote:
> On Tue, 2006-01-31 at 21:27 -0800, John Drake wrote:
> >
> > --- Charles Shattuck <cshattuck@xxxxxxxxxxxx> wrote:
> >
> > > I've figured out what was wrong with my @+.  The a
> > > register (EDX) gets
> > > clobbered in quite a few places in the kernel,
> > > including jump and swap.
> > > I decided to use EBX and call it b instead.
> >
> > Hello all,
> >
> > I missed this post the first time by so bear with
> > me. :) I'm just now starting to REALLY understand
> > ColorForth (working on a game demo now) so I
> > guess I'm late are realizing this, but it seems
> > that @+ isn't part of (many) Pentium ColorForth
> > implementations?  It's on Chuck Moore's website:
> >
> > http://www.colorforth.com/forth.html
> >
> > But it's not listed in the (unofficial) ColorForth
> > glossary.
> >
> > http://kristopherjohnson.net/cgi-bin/twiki/view/Main/ColorForthWord
> >
> > More importantly I needed it for my demo and I
> > noticed that it's not defined in either version
> > of ColorForth I'm using these days.  (ColorForth
> > for Windows and Terry Loveall's qemu implementation).
> >
> > Is there an @+ definition I can grab somewhere?
> > And why is it missing?  (Or am I just missing
> > something?)  I'm not sure what the point of an
> > A register is with out @+ and !+.
> >
> > Regards,
> >
> > John M. Drake
> >
> >
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> I put up a version of @+ using the B (EBX) register instead of Chuck's A
> (EDX) register at:
>
>  http://home.surewest.net/cshattuck/editor_additions_2.html
>
> Too many words in the kernel clobber the A register so its value can't
> be relied upon unless you know exactly what your words, including
> primitives, are doing.  It might be safer and simpler to use push, pop,
> swap, and over to let the address ride on one of the stacks in my
> opinion.  Even if you use the B register, which apparently is unused by
> the kernel, you need to push and pop its value if you call another word
> of your own that uses @+.
>
> Charley.
>
>
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