[Coco] 6X09 -> HC11/HC12

[jdaggett at gate.net]

JIm

The HC12 does not have the "U" register. Placing just that register 
outside the HC12 will not be the same. Doing an HC12 in an FPGA 
is a large task and not really cost effective unles you are interested 
in taking sections of hardware out and putting other digital lagic in. 
There is a question also as to whether the instruction set itself is all 
or part Intellectual Property.  

On 16 Jan 2004 at 22:30, jimcox at miba51.com wrote:

From:           	<jimcox at miba51.com>
Subject:        	Re: [Coco] 6X09 -> HC11/HC12
To:             	CoCoList for Color Computer Enthusiasts 
<coco at maltedmedia.com>
Date sent:      	Fri, 16 Jan 2004 22:30:46 -0800
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> James:
> 
> Thanks.  Isn't the HC12 missing a register that is in the 
> 6809?  If so, could a register be added via the use of a 
> small exteran FPGA?
> 
> Jim
> 
> On Fri, 16 Jan 2004 09:57:09 -0500
>   jdaggett at gate.net wrote:
> >jim
> >
> >The HC12 is more source compatible than the HC11. My 
> >guess 
> >closer to 95% compatible. 
> >
> >Internal hardware wise the HC16 is more useable but would 
> >require 
> >a more extensive rewrite.
> >
> >james
> >
> >
> >On 15 Jan 2004 at 20:38, jimcox at miba51.com wrote:
> >
> >From:           	<jimcox at miba51.com>
> >To:             	<coco at maltedmedia.com>
> >Date sent:      	Thu, 15 Jan 2004 20:38:04 -0800
> >Subject:        	[Coco] 6X09 -> HC11/HC12
> >Send reply to:  	CoCoList for Color Computer Enthusiasts 
> ><coco at maltedmedia.com>
> >	<mailto:coco-
> >request at maltedmedia.com?subject=unsubscribe>
> >	<mailto:coco-
> >request at maltedmedia.com?subject=subscribe>
> >
> >> I have a question for you CPU guru's out there.  Which 
> >>is 
> >> most like the 6X08, the HC11 or the HC12? 
> >> 
> >> Jim
> >> 
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> >
> >
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