[Coco] gcc m6809 update

[jdaggett at gate.net]

Roger

HC11 source code is about 90% compatible. Object code I am not 
so sure.

>From my knowledge and experience, albeit limited, there are 
similarities but not 100% compatible code. The HC12 is more 
upward compatible than the HC11 for the 6809.


james


On 12 Jan 2004 at 22:20, Roger Taylor wrote:

Date sent:      	Mon, 12 Jan 2004 22:20:54 -0600
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From:           	Roger Taylor <rtaylor at bayou.com>
Subject:        	Re: [Coco] gcc m6809 update
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> At 03:51 PM 1/12/2004 -0500, you wrote:
> >I will soon be undertaking the project of updating gcc for the m6809
> >to be based on the m68hc11 code, since the processors are very
> >similar.  This will be in an effort to increase the number of
> >"registers" available, by using a set of locations on a page
> >boundary, and the direct addressing mode.
> >
> >Why?  Well, then it'll be easier to use floating point math.  gcc
> >includes some support for soft floting point, and the code looks
> >complete for basic operations.
> >
> >Also, I'll be updating the machine description in CVS as soon as
> >possible. The old one is buggy, and contains invalid code for
> >generating subtraction assembly.  I received a fix from Eric
> >Botcazou, the guy who I got the files from originally.
> 
> Can 6811 code run on the CoCo or 6809?
> 
> 
> ----------
> Roger Taylor
> 
> 
> 
> 
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