[Coco] Modifying Level1/coco1 for 6309 native mode

[L. Curtis Boyle]

Yeah, I wish I still had time to work on it (but I don't seem to even have time to update the games webpage these days). And there were some many things that Bill and I were looking at adding, too...

L. Curtis Boyle
curtisboyle at sasktel.net



On Feb 14, 2014, at 4:43 PM, Robert Gault <robert.gault at att.net> wrote:

> Bill Nobel wrote:
>> You are on the right path Robert,  When Curt and I started the project I had to reverse engineer everything.  The defs files I modified for the 6309 register layout and other things we added.  I encased them into ifdef, else etc for the reassembly.  I basically added the Def reference to the code and reassembled it to make sure the module CRC was the same as the original.  Once that was done I concentrated on the conversion to 6309.
>> 
>>   It was a process to get the boot files converted. The hardest was the initial REL, BOOT and OS9P1 to convert to 6309 and make it fit in the boot track
>> 
>> -Bill
>> 
>> On Feb 14, 2014, at 10:54 AM, L. Curtis Boyle <curtisboyle at sasktel.net> wrote:
>> 
>>> This is exactly what Bill and I did to make NitrOS9 in the first place. :-)
>>> (To be honest, this earliest stage was much more Bill than me).
>>> 
>>> L. Curtis Boyle
>>> curtisboyle at sasktel.net
> 
> Bill and Curtis,
> 
> Nice to hear from you guys! The original NitrOS-9 was an incredible piece of work given it was a two man operation.
> 
> I think I may be wrong about one change in rbf.asm. I suggested
> shortly after L0604
>       lda   R$X+1,u        was $05,u
> 
> but the above may not be a register stack. The only way to tell will be to see if the code runs for both 6809 and 6309 systems.
> 
> Robert
> 
> 
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