This is zipcode, a C64 whole disk packer/unpacker (without much in the way of
compression,) which is needed to create the Expose' magazine disk (and other
things.)
 
Oddly enough, I couldn't find this  program on cco, so here it is.
 
One note about the program: if you only have a single drive,  be sure to set
the destination drive number before starting; else it dies not realizing
that you don't have a drive 9.
.