[Coco] 6X09 -> HC11/HC12

[jdaggett at gate.net]

Willard

The HC11/HC12 is somewhat assembly source compatible. The 
object code is the not. The HC12 is more compatible than the 
HC11. Any 6809 assembly code will have to be reassembled and 
tested completely. Also one must realize that one is going from a 
microporocessor top a microcontroller. The HC11/HC12 have built 
functions that are not on the 6809. More integrated functions does 
allow better acess, but can also fix where the I/O location is. For 
OS9 and the Coco that becomes a minor problem. I/O will most 
likely have to be moved from $FF00 to somewhere else.

james


On 16 Jan 2004 at 0:50, Willard Goosey wrote:

Date sent:      	Fri, 16 Jan 2004 00:50:28 -0700
From:           	Willard Goosey <goosey at virgo.sdc.org>
To:             	coco at maltedmedia.com
Subject:        	Re: [Coco] 6X09 -> HC11/HC12
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> >From: <jimcox at miba51.com>
> >Date: Thu, 15 Jan 2004 20:38:04 -0800
> 
> >I have a question for you CPU guru's out there.  Which is 
> >most like the 6X08, the HC11 or the HC12? 
> 
> I'd have to say the HC11.  The HC12 has evolved at least as far from
> the 6800 as the 6809 has, but in a different direction.
> 
> Both the HC11 and HC12 have the same basic assembly language, which is
> related but not identical to the 6809.  
> 
> Hardware wise, I can't really say... I don't have the HC12 hardware
> reference manual, just the assembly reference. :-(  
> 
> >Jim
> 
> Willard
> -- 
> Willard Goosey  goosey at sdc.org
> Socorro, New Mexico, USA
> "From Hell's heart I STore Accumulator B at thee!"
> 
> 
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