[Coco] Learning CPU Architecture and Digital Design

[Mark McDougall]

On 20/02/2013 10:30 PM, Mark McDougall wrote:

> Please understand that none of this is a criticism of your core in any way!

I should also add this:

My colleague originally decided he wanted to do a 68K (before they were 
freely available) but thought it would be a good idea to attempt a 6809 
first. So he took off with that and then it stalled for a few years.

I have always wanted to do a CPU core myself. Pretty much every core I'm 
interested in has been done, aside from some less popular cores used as 
audio CPUs in some arcade games. However, I'm not keen on investing a lot of 
time in doing a CPU that is only used for audio. The other possibility was 
an ARM2 (ARM250) for an Acorn Archimedes implementation. Not sure how ARM 
Holdings would feel about that either. :(

And so I find myself considering picking up the 6809 where my colleague left 
off, and at the same time had the idea to enhance it with 6309 and BDM 
modules. It gives me a head start, and I'm more familiar with the 6809. I 
also have plenty of test designs, and it's probably of interest to more people.

So none of this is bourne out of any great dissatisfaction with the CPU09 
core - not by a long shot!

Regards,

-- 
|              Mark McDougall                | "Electrical Engineers do it
|  <http://members.iinet.net.au/~msmcdoug>   |   with less resistance!"