Case: ECM-LX800D CF slot located as IDE Primary Slave. Customer require CF working as IDE primary Master mode.
Procedure:
1. Find CF slot
2. CF slot Pin 39 is CSEL (#Master) Active Low signal. The original SCH pull high for Making CF card as Slave Mode.
3. Find adjacent GND pin15 for connecting Pin39 as GND. It will make CF card working as IDE Primary Master Mode
4. Please refer below Picture for short those two pins.
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