The 1010 drive should work as an external 720k drive. Make sure you have the jumpers on the Bridgeboard set properly, the Bios configured correctly, and take a look in the PC Setup program on the Amiga side. Bridgeboards aren't the easiest thing to setup but they are cool. Keep with it and you'll probably get it working. Then, don't touch it:-). BTW the A1011 will NOT work as a Bridgeboard drive.
-Jeff