This was taken from the Discussion Forum posted by Mouser:
|Pin 1||VDD||Pin 4|
|Pin 4||CS||Pin 1|
|Pin 12||SO||Pin 2|
|Pin 16||SCLK||Pin 5|
|Pin 18||SI||Pin 7|
|Pin 21||VSS||Pin 3 and 6|
Internal PCB for the MMC cartridge:
MMC Adapter Schematic by octel:
- It has been pointed out that the "adaptors" that normally come with the smaller MMC-like flash cards (RS-MMC, mini-SD, micro-SD, etc) make reasonable (if somewhat large) sockets for the small flash cards.
PCBs by Westf W:
These mostly use the sockets available on eBay from eBay Seller exdwh, and are designed to be reasonably manufacturable using hobbyist PCB fabrication techniques.
Zip file of CAD files for Cadsoft EAGLE Media:flash-adaptors.zip (includes schematic, board layout, and etc) for several versions of flash adaptors and "helpers" that plug into the JuiceBox socket.