DiskDoubler GS
Written by John MacLean
Released into the Public Domain

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