[Coco] Programs larger than 32K?

[Arthur Flexser]

This switching of 32K banks is exactly what the KEY264K program does.  They
had it so you could either run 2 programs independently, each in one bank,
or have the bank switching controlled by interrupts so that in effect, the
two programs time-shared with one another and perhaps could access common
data via peeks and pokes.

Art

On Mon, Jan 21, 2019 at 9:44 PM Robert Gault <robert.gault at att.net> wrote:

> Don't know the name of those programs but take a look at the specs for the
> SN74LS783 (SAM) chip.
> You will see that in addition to all RAM and RAM/ROM ($FFDF/$FFDE) you can
> page switch. With 64k RAM
> installed, writing to $FFD4 gives (page0) normal 32k RAM, but writing to
> $FFD5 (page1) and your
> unused 32k is active. Since page switching leaves the ROM present, you
> might be able to have Basic
> programs switch pages and in effect use 64k of RAM.
>
> Robert
>
> L. Curtis Boyle wrote:
> > There were some commercial programs that allowed two 32k BASIC programs
> (after a little ML setup, it kept your ROM’s in the upper 32k, and bank
> switched two 32k RAM banks in the lower half. Can’t remember the names of
> them, though, off the top of my head.
> >
> > Sent from my iPhone
>
> --
> Coco mailing list
> Coco at maltedmedia.com
> https://pairlist5.pair.net/mailman/listinfo/coco
>