[Coco] Any reason to put a 6309 in a Coco2?

[Kenneth Schunk]

Another incompatibility is the upper page of memory in 64K RAM mode. 
This affected DEFT Pascal (and programs created with DEFT Pascal). The 
DEFT runtime system switched off the ROM's and started looking for RAM 
from the top of memory down. Since the top most page on the CoCo3 is 
the bank switching registers (amongst other things), the RAM test ended 
up crashing the CoCo3. A revised runtime library was needed to fix the 
memory check so it didn't crash the CoCo3.

Ken Schunk

On Dec 30, 2003, at 3:37 PM, Theodore (Alex) Evans wrote:
> A CoCo3 is not 100% CoCo2 compatible.  The main incompatibility is 
> that most of the semigraphics modes supported by the CoCo1/2 are not 
> supported by the CoCo3.