[Coco] [Color Computer] Re: POKE 65495,0

[James Diffendaffer]

--- In ColorComputer at yahoogroups.com, "James Diffendaffer"
<jdiffendaffer at ...> wrote:
>
> 
> >> Could it even be that different production runs of the SAM have
> >> different behaviors?
> >>
> >> JCE
> >>
> >
> >There was a second generation of the SAM chip called 74LS785 that I 
> >think appeared in the
> >Coco2. One of its main features was to extend the refresh counter from 
> >7 bits to 8 bits. This
> >allowed the usage of 64Kx1 dram chips. Since I don't have a spec sheet 
> >on the 74LS785, so
> >I can't verify that any other functions have changed. From what I have 
> >read the 74LS785 is
> >pin for pin compatible with the 74LS783/MC6883.
> >
> >james 
> 
> Actually, I think the newer SAM included a built in latch to reduce
> the motherboard parts count.  I don't think the pinout would change
> much but it would function differently.

Or was it the new version of the VDG that added the latch... not sure.