[Coco] NitrOS-9 and TCC1014

[Robert Gault]

Mark Marlette wrote:
> Robert,
>
> The sparkles are REALLY present in test case a.
>
> The point of crash is random. Once in 10 it will boot.
>
> VERY strange. Again only the GIME changes and it works.
>
> I will try a 6809 boot same test case tomorrow. Doubt there will be an issue.
>
> I do recall the boot problem prior to .06.
>
> Regards,
>
> Mark

If one assumes the crash is during the loading of the kernel and os9boot 
and then looks at the source code for boot and rb1773, you will find 
that timing constants are different in Level2 for 6809 and 6309 systems. 
That is not a surprise as the number of cycles for op-codes can change 
if run in 6309 native mode.
There is a small possibility that the older GIME is not able to handle 
the data flow at the faster speed of native 6309 code.

I guess a test of this possibility would be to use the same 6309 
assembly but forcing it to be in emulation rather than native mode for 
Boot and rb1773. Only problem with this test is the stack is handled 
differently in emulation vs native mode on interrupts.

Well let's see what you get for the 6809 code.