[Coco] 6809 assembly programmming

[jdaggett at gate.net]

Fedor

I can help some. I have done a bt of dissasembly work. Mostly with the 
HC11,  though the 6809 is not all that much more in complexity.  I t hink the 
hardest part of deciphering 6809 code is where the author uses an indexed 
pull of the PCR off the stack instead of a RTS command. At first glance this 
is often overlooked as an end to a subroutine. Much easier to look for the 
$39 opcode than for the other alternative. 

Probably the most difficult 68099 code that I have seen so far to dissaemble 
is one that is written in FIG FORTH for the 6809. That just makes a 
dissasembler go crazy with odd looking code.  

Also who has a good code seeking dissaembler for the 6809 that is PC 
based and does not cost an arm and a leg?

james

On 17 Apr 2008 at 8:19, Fedor Steeman wrote:

> I am definitely interested, although my time too, is limited...
> 
> Together with Briza I have set out to disassembling an old and
> relatively simple CoCo1/2 game, Pengon. We have definitely made a lot
> of headway, but perhaps if you could help us figuring out what certain
> routines do, that would be a big help! Our plan was to make to analyse
> the game's ML and rewrite it to make use of the CoCo3's graphics
> capabilities. There is still a long way to go...
> 
> Cheers,
> Fedor
> 
> On 17/04/2008, John Strong <johnstrong at hotmail.com> wrote:
> >
> >
> > To Allen & Others interested in 6809 assembly programming
> >
> > As time permits, I willing to help those wanting to learn 6809
> > assembly programming. time, being the key word here.
> >
> > Besides teaching full time, I also do software development, in
> > especially software for event photographers, so my time is pretty
> > full, but give me a try.
> >
> > > 20. Chicago CoCoFEST! 2008 photos now on disneyfans.com> (Allen
> > > Huffman)
> >
> > -- Allen PS - At the Fest, both Steve Bjork and John Strong gave
> > seminars dealing with 6809 assembly language programming and now I'm
> > wanting to dive in and learn more than what I know. Anyone wanting
> > to learn together -- maybe to work on a game or something -- drop me
> > a note!> >
> > _________________________________________________________________
> > Going green? See the top 12 foods to eat organic.
> >
> > http://green.msn.com/galleries/photos/photos.aspx?gid=164&ocid=T003M
> > SN51N1653A
> >
> >
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> >
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