[Coco] overdrive ...

[jdaggett at gate.net]

Kevin

It is my understanding that the instruction set is the same whether in 
6809 mode or in native 6309 mode. What happens is during most 
instructions the first byte of the next instruction is loaded and stored 
internally. Basically a simple one byte instruction pipeline. This 
accounts for most instrtuction executing 1 machine cycle faster. 

james


On 25 Apr 2005 at 21:05, Kevin Diggs wrote:

Date sent:      	Mon, 25 Apr 2005 21:05:47 -0700
From:           	Kevin Diggs <kevdig at hypersurf.com>
To:             	CoCoList for Color Computer Enthusiasts 
<coco at maltedmedia.com>
Subject:        	Re: [Coco] overdrive ...
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> Mark,
> 
> Mark Marlette wrote:
> > At 12:50 PM 4/25/2005, you wrote:
> > 
> > kevin,
> > 
> > Didn't understand your question on the 6309.
> > 
> > Mark
> > 
> 
>  I thought that when you turned on the 6309 extensions that you also
> lost some compatibility (instruction cycle counts). If this is true,
> won't it wreck havoc with certain parts of ROM BASIC?
> 
>      kevin
> 
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