135 lines
4.6 KiB
Plaintext
135 lines
4.6 KiB
Plaintext
NOTE!!!! This driver only works with the ancient Linux-2.4 kernel
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It will not run on anything recent.
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Plans are to make a FUSE-capable driver, see the ../dos33fs-fuse directory
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Apple II DOS 3.3 Filesystem for Linux
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by Vince Weaver (vince@deater.net)
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http://www.deater.net/weave/vmwprod/apple
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based on ProDos filesystem code
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Copyright (c) 2001 Matt Jensen (mjensen@obvion.com)
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http://www.obvion.com/matt/prodos/
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[-------------------------------------------------------------------]
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Background:
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In January of 1978, Apple Computer demoed the DISK ][ drive,
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arguably the first inexpensive 5 1/4" floppy drive for a personal
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computer. It was a very clever hack by Steve Wozniak, and was
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welcomed by Apple ][ users who until now had to make do with
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a casette tape interface.
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Dos 3.1 was released in 1978. Dos 3.2 and 3.2.1 were released
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in 1979. While both worked, neither were integrated very well
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with the Apple ][ computers of the time and had their share of bugs.
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In August of 1980 Dos 3.3 was released. It required not only
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an OS upgrade, but also a hardware one as well. Older DOS's
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could read 113.75k (35 tracks*13 sectors*256bytes). Under
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Dos 3.3 the disks could hold 140k (35tracks*16sectors*256bytes).
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Dos 3.3 was the standard disk OS on Apple ]['s for a long time,
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but it was limited to only 5 1/4" disks. Eventually it was
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replaced by ProDos, which was a weird combination of Dos 3.3 and HFS+.
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[------------------------------------------------------------------]
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Technical Info:
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* Partition size: 140k (in theory the filesystem can support more,
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but I doubt it ever did it most cases).
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* sector [block] size: 256bytes. Which makes it fun trying to make
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Linux deal with it properly.
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* Filenames: up to 30 characters in length, 7-bit ASCII.
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First character had to be > 63. No commas or colons.
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Padded on the right with spaces.
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Besides that, anything goes [including control characters,
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NULL's, and \, which make it interesting as a Unix filesystem]
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* 7bits of metadata: Indicate file type [binary, BASIC, text, etc]
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* "Lock": possible to "LOCK" files, that is make read-only
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* holes: filesystem supports holes in files [though Linux support of
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this a bit troublesome because of 256 byte block issues].
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* Timestamp: no timestamp possible. The driver assigns an arbitrary
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date of 13 February 1978 to all files. [2 1/2 years
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too early for DOS 3.3, but it is my birthday....]
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[---------------------------------------------------------------]
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Usage:
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You need to be running a 2.4.x linux kernel. Older versions
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not supported currently.
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The easiest way to do this is get a "disk image" of the type
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used for Apple II emulators.
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Various web pages can help you make these from your old Apple Disks,
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assuming you have a working Apple II, a modern PC, and a serial
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connection between the two.
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First, be sure your Linux kernel has "loopback filesystem support"
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Then, set up the disk image you want as a loopback device as root:
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/sbin/losetup /dev/loop0 ./green.dsk
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Where "green.dsk" can be any image you might have.
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Next, compile the included driver [ "make"]. As root, install
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the dos33.o module
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/sbin/insmod ./dos33.o
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Next, mount the filesystem
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mount -t dos33 /dev/loop0 /mnt
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And if all went well, you can now do an "ls /mnt" or wherever,
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and get the file listing.
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You can use the "asoft_detoken" program in the ./util
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directory to dump Applesoft basic programs into plain text
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asoft_detoken < /mnt/HELLO
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[----------------------------------------------------------]
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Future plans:
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Make the driver read/write. Right now it is read-only.
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Maybe add some more utilities.
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Handle the file-type metadata somehow.
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Far-out-there.... write a linux block-device for the DISK ][
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drive, so you can actually hook the old drives and disks up
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directly to your linux box....
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[-------------------------------------------------------------------]
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References:
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http://apple2history.org/ -- great history site
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http://ground.icaen.uiowa.edu/apple2/ -- treasure trove of apple][ info
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[-------------------------------------------------------------------]
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Added note:
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if anyone has a copy of "Inside Apple DOS" they'd be willing
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to part with, please let me know....
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