[Coco] Color basic and available RAM

[Ronivon Costa]

Why paged memory can' t be added in a cart, for example?
With one extra register or memory address, an external RAM and controller
could certainly be implemented to switch banks.

I can see that working for programs (even BASIC) and in  a more complex
scenario, to any program by modifying the BIOS.
Using pokes to switch ROM into RAM, the BIOS could possibly be modified to
use paged memory.
Let's say, instead of 65535 addresses, we would only use 32768 continuous
memory. Any bit higher than that in an address would be to switch to a
different memory page.

Why not exactly possible? Or not practical for any reason?



On 11 February 2015 at 16:51, Darren A <mechacoco at gmail.com> wrote:

> On Wed, Feb 11, 2015 at 9:20 AM, John Guin wrote:
>
> > There were some tweaks that would move the Color Basic and Extended Basic
> > ROMS around to give around 39K of free memory on a 64K machine.  I may
> not
> > remember the specifics correctly - maybe one of the early years in the
> > Rainbow had this?
> >
> > Never saw it used much, though.  I was always jealous of C64 owners for
> > this (weird) behavior.  When they booted, they had much more free memory
> > than the Coco.
> >
>
>
> That is what the Dragon 64 does as well.  When you boot a D64 you have the
> same ~24K available like a CoCo. If you enter EXEC it switches to All RAM
> mode and copies an alternate version of the Basic interpreter from ROM into
> RAM at $E000, giving you an additional 16K to work with.
>
> - Darren
>
> --
> Coco mailing list
> Coco at maltedmedia.com
> https://pairlist5.pair.net/mailman/listinfo/coco
>