The DKB does not like active termination, like that built into the zip drive. You need to use passive termination, or the drive needs no termination if it is NOT the last device on the chain.
Also, you need to make sure you have the latest fastfilesystem in L:
Finally make sure you have selected the right device #, 5 or 6 on the zip drive and your Zip mount list refers to that number...
Good Luck