Hello there. I have an A-1200. I am currently
Using an SMC ( EZ PC 10 ) PCMCIA-2-EtherNet
Card. I Also have A Motorola PCMCIA-Modem
Card ( Mobile Surfr 56k V90 { UpGradeable }.
As for using A PCMCIA-USB Card with the A-600 or
A-1200, I have seen a PCMCIA Adapter to allow the use of Type III cards in a Type II Slot.
Not Sure IF The Posiden USB Stack Software has support for A PCMCIA-USB Card.
On Ebay I have seen PCMCIA-Compact Flash Adapter
that would work with the Amiga-600 and A-1200.
If you ever decide to use the PCMCIA Port for
Another Purpose Other then USB I have Successfully Setup Miami to use either a PCMCIA-Modem Card and Or A PCMCIA EtherNet Card.
I have the Device Drivers and Miami Default for both types of PCMCIA Cards.
Have a Nice Day.