[Coco] CoCo2 RAM upgrade idea questions

[Allen Huffman]

> On Jan 23, 2015, at 6:12 PM, Zippster <zippster278 at gmail.com> wrote:
> 
> What size RAM bank would be best to swap in and out the 64k addressing space
> from the extended memory?

The CoCo 3 swaps out 8K blocks. If that were doable, perhaps porting OS-9 L2 to the CoCo 1/2 would be possible. Interesting.

> From the programming (OS9) point of view, what is the preferred method of handling the
> bank switching?  And how has it been handled in the past with ram upgrades on the CoCo1/2?

I never knew anyone with an upgraded CoCo, but I recall ads in Rainbow advertising upgrades "up to 8mb" back then. Wild.

> What would be the best amount of total memory?  2mb?

Does anyone even make >512MB upgrades for the CoCo 3 these days?

> What would be the best version of OS9/NitrOS9 to run on a CoCo1/2 with extended memory?
> Level 2?  Level one is for just 64k systems?

Level 1 wanted a flat memory map. The modern OS-9/68K/PPC/etc. is Level 1, using the MMU only for memory protection (if the system has it). Level 2 was the one that used an MMU to remap memory.

I wish I could remember more.

		-- A