[Coco] Color basic 1.0, 1.2 differences.

[Robert Gault]

Phill Harvey-Smith wrote:
> Hi,
> 
> I'm currently working on cleaning up and unifiying the way that memory 
> in mess is handled between the CoCo 1/2 and Dragon machines. I seem to 
> have this mostly sorted,however I have run into the following problem,
> that the CoCo 1 emulation using Color basic 1.0 seems only to recognise
> the 4K and 16K configurations, setting it to 32K or 64K results in a 
> machine with 4K.
> 
> Tracing through the initialisation code, I have found that the init 
> sequence is different for CB 1.0 and CB 1.2 was the above behavior a 
> limit of CB 1.0 ? that it could only support 4K and 16K of memory. If 
> this is the case then I'll change the coco driver so that it can only be 
> configured for these settings, if not I'll have to dig deeper :)
> 
> Cheers.
> 
> Phill.
> 

Memory was not detected by just the software. There are jumpers on the 
boards that signal 16K or 32K RAM. There were also bypass caps that 
needed to be removed when using 32K RAM.

The net result was that the Coco1 worked with 64K RAM. I've got an 
F-board stocked that way and it had the original Extended Color Basic v1.0.