On Mon, Jun 24, 2013 at 12:26 AM, Cory Smelosky <b4 at gewt.net> wrote:
  Any ideas what the compression format might be?
I'm doubting something too
 proprietary?  If anything the decompression executable is in the PROMs... 
I can't remember what type of compression it uses. Not sure I ever
knew. But you're right, it's probably not proprietary. Unless they
were really paranoid and wanted some security through obscurity, why
reinvent the wheel?
Jim