I found this program searching for a way to add a ZIP drive as storage to a CMD Hard Drive.  There are full docs on the disk but unfortunately I don't have any screenshots of the program in operation because I don't have a CMD HD hooked to my test rig.  Here is a blurb from the docs on the disk:

This porgram was written to use another SCSI  device  (e.g.  ZIP,
HD,  SyQuest) which is connected to a CMD-HD. There are two seve-
ral programs: One for the C128 (only 80 columns) and one for  the
C64.  The  assembly  program is used by both programs und must be
placed on the start drive.