4. Digital TK50Z-GA (can this be used on a Micro
pdp?)
Maybe, if the Micro PDP has a SCSI controller.
Then again, it's hard to say. The TK50Z and TZ30 both have fairly
wacked-out SCSI implementations (and not even in exactly the same ways),
and neither is known to work reliably on much of anything other than
a VAXstation.