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doc/disk-apple2.md

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-apple2
-====
-## Prodos, Appledos, and CP/M
-<!-- This file is automatically generated. Do not edit. -->
-
-Apple II disks are nominally fairly sensible 40-track, single-sided, 256
-bytes-per-sector jobs. However, they come in two varieties: DOS 3.3/ProDOS and
-above, and pre-DOS 3.3. They use different GCR encoding systems, dubbed
-6-and-2 and 5-and-3, and are mutually incompatible (although in some rare
-cases you can mix 6-and-2 and 5-and-3 sectors on the same disk).
-
-The difference is in the drive controller; the 6-and-2 controller is capable
-of a more efficient encoding, and can fit 16 sectors on a track, storing
-140kB on a disk. The 5-and-3 controller can only fit 13, with a mere 114kB.
-
-Both formats use GCR (in different varieties) in a nice, simple grid of
-sectors, unlike the Macintosh. Like the Macintosh, there's a crazy encoding
-scheme applied to the data before it goes down on disk to speed up
-checksumming.
-
-In addition, a lot of the behaviour of the drive was handled in software.
-This means that Apple II disks can do all kinds of weird things, including
-having spiral tracks! Copy protection for the Apple II was even madder than
-on other systems.
-
-FluxEngine can only read well-behaved 6-and-2 disks. It doesn't even try to
-handle the weird stuff.
-
-Apple DOS also applies logical sector remapping on top of the physical sector
-numbering on the disk, and this _varies_ depending on what the disk is for.
-FluxEngine can remap the sectors from physical to logical using modifiers.  If
-you don't specify a remapping modifier, you get the sectors in the order they
-appear on the disk.
-
-If you don't want an image in physical sector order, specify one of the
-filesystem ordering options. These also select the appropriate file system;
-FluxEngine has read-only support for all of these.
-
-In addition, some third-party systems use 80-track double sides drives, with
-the same underlying disk format. The complication here is that the AppleDOS
-filesystem only supports up to 50 tracks, so it needs tweaking to support
-larger disks. It treats the second side of the disk as a completely different
-volume.
-
-## Options
-
-  - Format variants:
-      - `140`: 140kB 5.25" 35-track SS
-      - `640`: 640kB 5.25" 80-track DS
-  - Filesystem and sector skew:
-      - `nofs`: use physical CHS sector order and no file system
-      - `appledos`: use AppleDOS soft sector skew and file system
-      - `prodos`: use ProDOS soft sector skew and filesystem
-      - `cpm`: use CP/M soft sector skew and filesystem
-  - `side1`: for AppleDOS file system access, read the volume on side 1 of a disk
-
-## Examples
-
-To read:
-
-  - `fluxengine read apple2 --140 -s drive:0 -o apple2.img`
-  - `fluxengine read apple2 --640 -s drive:0 -o apple2.img`
-
-To write:
-
-  - `fluxengine write apple2 --140 -d drive:0 -i apple2.img`
-  - `fluxengine write apple2 --640 -d drive:0 -i apple2.img`
-
-## References
-
-  - [Beneath Apple DOS](https://fabiensanglard.net/fd_proxy/prince_of_persia/Beneath%20Apple%20DOS.pdf)
-
-  - [MAME's ap2_dsk.cpp file](https://github.com/mamedev/mame/blob/4263a71e64377db11392c458b580c5ae83556bc7/src/lib/formats/ap2_dsk.cpp)
-
+-d
+\r