I have a Bitsy (ADS BITSY Windows CE Ver.(3.12)/ADS Bitsy Rom Ver. 1.71) with the optional connector board with the compact flash socket. I am using a Socket LP-E/10 compact flash ethernet card. When inserted into the Bitsy's compact flash socket it brings up the "Unidentified PCCard Adapter". If I take the same LP-E/10 and insert it into a PCMCIA adapter and into the PCMCIA socket of the Bitsy it will recognize the LP-E/10. Also if I insert a 16M Viking compact flash into the cf socket the Bitsy it will not recognize but will in the PCMCIA socket.
Thanks for the details of your message. One thing to check is that the connector board is fully seated onto the Bitsy. The headers from the connector board should be seated within 1mm of the bottom of the Bitsy sockets.