[Coco] CoCo Flash

[RETRO Innovations]

On 2/6/2016 10:49 AM, Brett Gordon wrote:
> Very cool. This can be flashed from the coco?   This would be a perfect
> device for a ROM disk driver for YA-DOS, or even HDBDOS.  How hard would it
> be to make something like this do RAM?
Can you elaborate?

I assume you're asking for a large RAM to be available on the expansion 
port for reading and writing.

That... is easy, if indeed that is all that is needed.  How much RAM is 
wanted?

The only problems I see are:

  * If you want this RAM to survive power outage (battery backed), that
    could be a challenge unless the RAM is SRAM or a facility is created
    to stow it on SD or ROM.
  * SRAM gets somewhat expensive, moreso than FLASH.  One of my other
    designs (for another platform) has 1MB of SRAM, though...
  * DRAM cannot be easily battery backed.