[Coco] TANDY Assembly Exhibit: CocoMEM Jr.

[RETRO Innovations]

http://www.go4retro.com/products/cocomem-jr/

The CocoMEM Jr. memory expansion unit adds Coco3-compatible MMU 
capabilities to your TANDY Color Computer 1, 2, and Dragon systems.  
Plugging into the 6809 socket, CocoMEM Jr. allows non Color Computer 3 
owners the expanded memory and MMU functionality previously unavailable.

Still in development, the CocoMEM Jr. already supports the following 
features:

The CocoMEM design supports the following features:

  * Hardware support for 2 MB of system RAM (development units have
    512kB of RAM installed)
  * 8 bit task registers
  * Support for 32 CPU MMU tasks, each with their own set of task registers
  * Support for 256 CPU MMU “tasklets” per task, each with their own set
    of task registers

Additional immediately planned features:

  * 16 bit task registers
  * Hardware support for 64MB of system memory
  * Per task bank write protect capability
  * Per task bank CPU read interrupt
  * Per task bank CPU write interrupt
  * “Move” 8kB segments of main memory around within the first 64kB of
    memory space
  * 512kB “emulation” mode (on Barry Nelson’s request)
  * NoCan3 $ff9b bank register support

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