[Coco] Coco 1 and 2 RAM Expanders (was: Bubble Memory)

[Zippster]

> On Aug 16, 2017, at 1:35 AM, RETRO Innovations <go4retro at go4retro.com> wrote:
> 
> I think my question is more:  If you have access to ~64kB of Video memory in "bank" 0, if it were, do you really need access to more RAM for the VDG?

No, a few video pages is enough most of the time.

>> 
>> 
> I don't think SLENB pages out RAM, just IO.
> 
> 

It does for reads, though the underlying ram will still receive a write.  You can replace system ram with banks of
external ram using SLENB.  I’ve done it before.

An area for VDG use just needs to be left open.

- Ed