[Coco] Coco 3 Memory Map Questions

[Darren A]

On Thu, Feb 11, 2016 at 6:04 AM, Robert Gault wrote:

> Why bother doing these tests on real hardware? You should be able to do it
> with an emulator such as MESS much more easily. Change the ROM content with
> a PC editor file and start emulation even though the emulator might
> complain about a "bad" ROM.
>


But why bother with the test at all?

If you have an understanding of hardware, a review of the CoCo3 schematic
would reveal that it simply isn't possible for the vectors to be mapped at
$BFFx.  Look at how the address pins of the ROM are connected directly to
the CPU address bus and then explain how the $BFFx locations could be read
when the CPU is presenting $FFFx.

- Darren