Apple II GCR

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The Apple II provides very fine-grained control of the drive from software, so various kinds of schemes were devised.

A discussion of how the Disk II works: http://www.metafilter.com/114962/jmp-TRIGSPIKES#4301468

There are two "standard" Apple II GCR formats, 13-sector and 16-sector. Both are explained in detail in Beneath Apple DOS.

http://www.classiccmp.org/cini/pdf/Apple/Beneath%20Apple%20DOS.pdf


Prince of Persia and other software used a format called RWTS18, designed by Roland Gustafsson to pack the maximum possible data onto a disk. Some details can be seen here:

http://pastie.org/private/mivibuirv3nomrqndjblcw

Not everything in that old cracking guide is accurate. For example, normal-speed drives were used to write RWTS18 disks.

More will be added soon.

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