[Coco] Has anyone ever seen one of these? - Unassembled CoCo2

[Darren A]

On Sun, Jan 11, 2015 at 2:15 PM, Zippster wrote:

> I noticed the same thing.  Is there any important difference between the
> two?
>
> - Ed
>
> > On Jan 11, 2015, at 2:52 PM, Darren A wrote:
> >
> >Later CoCo 2s used the newer 74LS785 SAM which I think is much
> > harder to find.
> >
> >
>


The 785 supports 16Kx4 and 64Kx1 DRAMs with 256 column refresh.
The 'P' control bit (Page) is utilized for the additional configurations.

The 1.3 version of Color Basic was created to support these changes in the
SAM initialization code.

- Darren