[Coco] Another NitrOS-9 Platform?

[jdaggett at gate.net]

Boisy

Converting 6800 software to 6809 is not a major task. SInce most of 
the 6800 assembly source is upward compatible, the work is rather 
easy. The hardest part is to write macros for the instructions that the 
6800 has that the 6809 does  not. 

The 6502 is a similar beast to the 6800 but not as close as th e6809 
to 6800. The 6502 does have similar pnuemonics but the internal 
programming model is significantly different. The 6502 has only an 
8 bit index register and one less 8 bit accummalator. 

Don't get me wrong, it is feasable to rewrite the 6502 code to 6809 
code, but I really don't think it is a one night job. It is different from 
getting a VDU to print "Hello World" than to get a full working basic 
interpreter.

just my thoughts

james   

On 12 Apr 2006 at 16:34, Boisy Pitre wrote:

> Just throwing something out here...
> 
> A friend of mine here at UL is graduating with me in computer  
> science.  He's a bit younger but had an Atari XEGS when he was a kid,  
> and recently bought one off of Ebay.  We were talking about the CoCo  
> and the idea hit me: wouldn't it be possible to take the 6502 out of  
> that computer and replace it with a 6809 using a specialized  
> daughterboard?
> 
> Well apparently someone has already done this:  http:// 
> www.gifford.co.uk/~coredump/sixadapt.htm
> 
> I think this is a very cool idea and would open some cool opportunities.
> 
> Boisy
> 
> 
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