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Thread: Apple II disk format

  1. #1
    Join Date
    Sep 2003
    Location
    Atlanta, Georgia (USA)
    Posts
    178

    Default Apple II disk format

    Does anyone have a good primer on the Disk II data encoding scheme, Group Code Recording (GCR)?

    I'm looking to archive my various Apple II floppies. I know PC disk controllers can't read them, but I have a Catweasel "universal" floppy controller. I hope to modify some of the software that comes with the card to read the Apple diskettes and need to understand the technical details around the actual physical disk format.

    -Matt

  2. #2

    Default

    You want to find a real or online copy of Beneath Apple DOS and/or Beneath Apple ProDOS. Here is a citation of some relevant bits for you:
    http://www.umich.edu/~archive/apple2...k.encoding.txt

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