[Coco] gcc m6809 update

[jdaggett at gate.net]

Theodore

Be carefull,  HC11 and 6809 source code are not 100% compatible. HC11 
assembly source has instructions that are not backward compatible to the 
6809 source. 

ex: IDIV and FDIV have no 6809 equivalent. ALso in the 68HC11 are 
BRSET and BRCLR instructions. Also the INC/DEC on index registers 
(INX,INY,INS, DEX, DEY,DES) have no direct equivalence.They must be 
done with post or pre increment/decrement.

You will have to go through the HC11 code and identify source instructions 
that are not identical and change before assembly. Be careful and be 
warned.

james
 

On 12 Jan 2004 at 18:45, Alex wrote:

From:           	Theodore (Alex) Evans <alxevans at concentric.net>
Subject:        	Re: [Coco] gcc m6809 update
Date sent:      	Mon, 12 Jan 2004 18:45:29 -1000
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> On Jan 12, 2004, at 6:20 PM, Roger Taylor wrote:
> 
> > Can 6811 code run on the CoCo or 6809?
> 
> It may be possible to assemble 6811/6800 code with a 6809 assembler
> and run it (like you can do with 8080 code on an x86) but it will not
> run directly.  I am not completely sure what all the enhancements from
> the 6800 to the 6811 are.
> 
> 
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