[Coco] 6809 / General CPU question

[William Astle]

On 11-02-19 06:28 PM, Stephen H. Fischer wrote:
> Hi,
>
> But the ROM is running at power on!
>
> It is a little tricky switching the FFFE, FFFF area from ROM to RAM 
> but it is done at power on.
>
That turns out not to be the case. Have you ever tried to change the 
values in the vector table? It's not possible.

Besides, the time under discussion is at CPU startup when nothing has 
had a chance to copy anything to RAM yet! The vector fetched from 
FFFE/FFFF MUST be in ROM or something similar or the system could never 
bootstrap.