[Coco] Tandy Assembly Exhibit: CocoMEM

[RETRO Innovations]

The CocoMEM memory expansion system for the Color Computer 3 comprises a 
single circuit board that plugs into the Coco3 GIME socket, with the 
GIME IC plugged into the CocoMEM circuit board.This allows the circuit 
board to capture all signals needed for complete MMU functionality 
without requiring any irreversible modification to the Coco3.To remove, 
simply remove CocoMEM and replace the GIME in the original 
socket.Existing memory in the Coco3 can be left in place (feel free to 
remove if desired), and no capacitors must be clipped or otherwise 
removed.No additional installation effort is required.

The CocoMEM design supports the following features:

  * Hardware support for 64 MB of system RAM (test units have 4MB installed)
  * 16 bit task registers
  * Dual MMU support (Separate registers for video MMU and CPU MMU)
  * Map video MMU registers to any 512kB bank in memory
  * 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
  * 512kB “emulation” mode (on Barry Nelson’s request)
  * NoCan3 $ff9b bank register support

  Additional immediately planned features:

  * Per task bank write protect capability
  * Per task bank CPU read interrupt
  * Per task bank CPU write interrupt
  * Map any GIME MMU register to any 8K bank in memory, no 512kB segment
    restriction

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

Jim

-- 
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