DiskDoubler GS
Written by John MacLean
Released into the Public Domain

General Notes about John MacLean's source code
John sold his hard disk complete with contents when he decided to move on from Apple II development. He has agreed to place his source code into the public domain for the benefit of other programmers. 
If you use John's source code, please credit him in your program and documentation.
John used Roger Wagner Publishing's Merlin Assembler. 

Notes about this release
This is the basis for a disk compression utility for the Apple IIgs which would have similar functionality to AutoArk(tm) or Hardpressed(tm).
This utility is not complete. Only the low level routines exist. There is no user interface. Installing an assembled version in your system is not recommended.  
The main link file is named GO.S