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Amiga Plus Special 18
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AMIGAplus Sonderheft 18 (1999)(ICP)(DE)[!].iso
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FS1541-13
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FS1541.DOC
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1999-01-03
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===========================================================================
FS1541 v1.3
===========================================================================
(C) Copyright 1996-1999 by Michael Krause.
For license see the file COPYING
===========================================================================
---------------------------------------------------------------------------
>>> INTRODUCTION
---------------------------------------------------------------------------
Forget all those nasty tools to read files from 1541 disks:
FS1541 is a full-blown AmigaDOS file system, which reads and writes
the CBM 1541 disk format. The CBM 1541 floppy drive has been the
standard disk drive for the C64 computer series, and many people still
have disks flying around. In order to process disks directly, you
need the >Catweasel< floppy disk controller and a 5.25 inch drive.
The Catweasel (available from Vesalia Germany), which includes this
file system, lets you use standard PC disk drives to read and write PC
and Amiga DD/HD disks at a much higher speed than provided by the
Amiga custom chips. When used with a 5.25 inch disk drive, you can
use this file system to process 1541 disks directly.
If you don't have a Catweasel, you'll have to use "fmsdisk.device"
from Aminet or somewhere, which lets you operate on ".d64" disk image
files.
You can get more information about the Catweasel from:
- the author himself, Jens Schönfeld <sysop@nostlgic.tng.oche.de>
- http://members.tripod.com/~apd2/catweasl.htm
---------------------------------------------------------------------------
>>> INSTALLATION
---------------------------------------------------------------------------
There are two versions of 1541-handler, one for plain 68000 machines and
one optimized for the 68030 processor (which will also work fine on an
68020). Copy the respective file to "L:1541-handler". Then add the
following lines to "DEVS:MountList":
CBM0:
Handler = L:1541-handler
Stacksize = 4096
Priority = 10
GlobVec = -1
Mount = 1
Startup = "DEVICE multidisk.device UNIT 1"
#
Explanation of options:
D=DEVICE/A Name of a trackdisk.device compatible device.
Supported and tested are "multidisk.device" and
"fmsdisk.device".
U=UNIT/N/A Exec device unit. 0 or 1 for "multidisk.device",
see docs for "fmsdisk.device".
F=FLAGS/N Exec device flags. Defaults to 16 for multidisk.
NS=NOAUTOSCAN/S Don't read complete disk after insertion.
I=INTERLEAVE/N Sector interleave when writing data. Defaults to 4.
ICON/K Followed by the complete pathname of an alternative
file used as Disk.info. There are two icons in this
archive, the ugly one painted by me is included in
the executable as the default icon.
---------------------------------------------------------------------------
>>> USAGE
---------------------------------------------------------------------------
Issue the command `mount cbm0:', and insert disks. Write support works
okay as long as the BAM is not corrupt. Unfortunately, this version does
not feature a disk validator, but I will add that. You need the
multidisk.device 2.0 to be able to write and format disks (with
fmsdisk.device it's no problem, of course).
There are four so-called "virtual" files, which don't appear in the
directory and serve special purposes:
$ Contains an ANSIfied directory as it would be given
by a C64/1541 with LOAD "$",8 and LIST.
$d64 Access the .d64 file corresponding to the current
disk. E.g. you can use `copy cbm0:$d64 ram:dsk.d64'
to create .d64 images of your disks very easily!
You can also write to this file and modify the disk
directly in a file monitor. After modifying I
suggest you issue a 'diskchange' command.
$opt If you access this file in any way, e.g. by means
of type or delete, the directory is optimized: All
(invisible and visible) DEL entries are thrown out.
You must know that files are not deleted completely
with "delete", but rather set to DEL instead.
This operation discards those directory entries.
Disk.info Provides a disk icon for Workbench. See `ICON'
startup option.
The last file can be overridden, i.e. you can create a real file called
`Disk.info' on the disk which will be visible then. If you delete it, the
virtual file will become active again.
When formatting disks, the system is told the disk consists of one big
cylinder. This is due to the variable track layout on a 1541 disk!
---------------------------------------------------------------------------
>>> HISTORY
---------------------------------------------------------------------------
V1.3 (01-Jan-99) (most changes by John "Graham" Selck)
- Improved error handling. Finally retries on errors are done.
- BAM handling is more secure now.
- Slightly adjusted block allocation algorithm
- Support for illegal directory filetypes
- Some minor bug fixes.
v1.2 (29-May-97)
- Fixed possible crash when mounting the device from DEVS:DOSDrivers,
before the Workbench is started.
- Included disk icon from Thomas Broß and the ICON startup option.
v1.1 (19-Feb-97)
- Bug fixed in handling of unformatted disks.
- German translation of TFM
v1.0 (20-Jan-97)
- You can rename files and disks now!
- Writing many small files is faster, since the BAM update is done only
once: one second after the last access, just like the ROM FileSystem
does it.
- Removed bug in ACTION_PARENT
v0.7 (15-Dec-96)
- Block allocation assumed a wrong BAM structure, now fixed.
- Virtual file '$opt'
- Formatting
- Everything works fine with the new multidisk.device 2.0!
v0.6 (08-Dec-96)
- You can write files now!
- Virtual file '$'
- Some small bugs fixed
v0.5 (24-Nov-96)
- First public release
A detailed list of changes can be found in file "ChangeLog".
Thanks must go to John Selck (Graham/Oxyron) for his numerous hints and
tips to the structure of 1541 disks. My documents contained many errors!
Without him this FileSystem wouldn't be so stable.
---------------------------------------------------------------------------
>>> FUTURE
---------------------------------------------------------------------------
- Virtual file $val, which can be used to validate disks.
- ACTION_SET_FILE_SIZE
- Linux port (as soon as I've figured out how the kernel works...)
---------------------------------------------------------------------------
>>> WHAT ABOUT THE SOURCE CODE?
---------------------------------------------------------------------------
FS1541 was entirely written using GCC 2.7.2.1 from the ADE as found on
ftp.ninemoons.com or the Geek Gadgets 1 CD. The source code is IMHO a good
example of how AmigaDOS handlers work.
---------------------------------------------------------------------------
>>> WHERE TO FIND THE AUTHOR:
---------------------------------------------------------------------------
Michael Krause
m.krause@tu-harburg.de
rawstyle@ms.demo.org
http://www.tu-harburg.de/~semk2104/
---------------------------------------------------------------------------
>>> LEGAL MUSH!
---------------------------------------------------------------------------
This program has been released under the GNU General Public License,
see the file COPYING and the source headers for details.