Commodore 1541/1571 GCR

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Commodore GCR format

Ref: "Commodore GCR Mysteries" (Spiro Trikaliotis) -- http://blog.trikaliotis.net/2010/03/05/Commodore-GCR-mysteries

Transactor v5i3 (some interesting stuff on copy protection) -- http://www.csbruce.com/cbm/transactor/v5/i3/

http://en.wikipedia.org/wiki/Group_Code_Recording -- CBM GCR code table

http://c64preservation.com/dp.php?pg=protection -- more stuff on copy protection