3ds cartridge slot cover - ATX 24-pin 12V Power Supply Pinout winner 888 slot

Bridges pin 1 (GND) and 2 (CD#) on slot side as cartridge is inserted 3 CLK Input Clock, 25MHz 4 RCLK Output Return clock; Game cartridge sends back CLK signal ...

Wrong ink cartridge installed in the slot. ... If you insert the PG-260XL Black ink cartridge and the CL-261XL Color ink cartridge into the wrong slot, the printer will not be able to read the cartridge information and operate normally.

For Nintendo 3DS on the 3DS, a GameFAQs message board topic titled "new 3ds xl micro sdhc capacity and speed".