If you do in fact have a Zip 100 Plus external drive. it means that it will accept both SCSI and Parallel printer port as a means of connecting to a computer. One port is for SCSI, the other is for the parallel printer port on older DOS/Windows PCs. So far, it appears that it may have automatic SCSI termination or the termination is enabled by factory default. After doing some research on the Apple Discussions forum on Apple's website, someone posted having the same type of drive and mentioned it being "self-terminated". So that means it has termination enabled as a factory default.

My advice if you have additional external SCSI devices to daisy-chain together, make sure the Zip drive is the last one on the chain. It shouldn't matter which SCSI ID number (5 or 6) that you chose, as long as you don't assign that same number to another SCSI device on that chain.

73s de Phreakout. :rambo: