[Coco] Re: Any reason to put a 6309 in a Coco2?

[jdaggett at gate.net]

Tim

Thanks for that bit of info. I did not know that.
I wonder how big the die was for the first parts from Hitachi?
I believe the Motorola die originally was fairly large. I have parts with three different 
mask ID set on the 68x09E parts. That tells me fab changes and/or die shrinks or 
fixes.

james

james
 

On 31 Dec 2003 at 13:21, tim lindner wrote:

> Gene Heskett <gene.heskett at verizon.net> wrote:
> 
> > AIUI, running in the default powerup 6809 mode, it perfectly
> > emulates the 6809 with the exception of doing a prefetch of the next
> > instruction if it has something else to do internally, and this does
> > increase the speed a few percentage points.  But unless whatever
> > you're doing is timed by the cpu instead of the clock, you'll
> > probably not be effected in any way you can detect.
> 
> In startup mode then 6309 has the same instruction cycle count as the
> 6809.
> 
> You don't get faster instructions until you switch to native mode.
> 
> If your programs stick to the instructions listed in Motorola's
> manual, you timing loops will be fine.
> 
> -- 
> tim lindner
> tlindner at ix.netcom.com                                   Bright
> 
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