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FILE: DMS.doc - AmigaDOS version 1.11 documentation - 7/1/91
*****************************************************************************
The DISK-Masher
Copyright (c) 1989-1991 SDS Software
*****************************************************************************
What is it?
The DISK-Masher (DMS) is a utility that allows users to compress and
archive floppy disks. Version 1.11 requires at least 512k of memory, and
AmigaDOS version 1.2 or later.
Why a disk archiver?
Many programs are available for archiving individual files and do a
relatively good job. However DMS was created for the purpose of archiving
whole disks. It is useful for archiving non-filing system disks which cannot
be done with standard file archivers, sending distribution disks, archiving
library collections, and many other uses. DMS takes much less time to
put a disk back together than with a file archiver and is less wear and
tear on your disk drives.
Why not use other disk archivers?
DMS has been tested against every other similar type programs and will
provide faster execution, greater compression, more support features, and
continuing user support. Once you try DMS you won't be satisfied with
anything else. Among other things DMS provides:
- Highly optimized compression routines offerring the utmost
in speed and compression. 4 different routines to choose from
to satisfy your needs.
- The ability to read and write to or from any AmigaDOS device conforming
to the standard 80 tracks , 512 bytes per block , 11 blocks per track,
2 sides, Ex: DF0:, DF1:, RAD:, etc.
- Extended Virus checking of the boot blocks. Other disk archivers
just show the boot block and do not check for viruses, this is
extremely stupid, most viruses do not come out and say "Look here,
I'm a virus!". Without actually checking the boot block you're
opening up a can of worms. Therefore DMS currently checks for over
60 different viruses and custom boot blocks and can automatically
install the disk. It is still Important that users monitor their
system periodically with a virus checker as there are many types
of viruses.
- Data Security. DMS has the option to encrypt archives with a user
selected password for security.
*****************************************************************************
Command Line Options and Usage
The general format for a DMS command is:
DMS command file[.DMS] [OPTIONS ...]
Everything in braces [] is optional. Everything else is required.
file[.DMS] is a user specified filename. The .DMS ending will
automatically be appended to the filename if you do not include it.
This is done to avoid confusion with other archiver formats.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1.) READ
This command will read and compress a disk. The basic usage for this
command is:
DMS Read file[.DMS] [FROM Dev:] [TEXT filetext] [CMODE mode] [LOW lowtrack]
[HIGH hightrack] [NOVAL] [NOZERO] [ENCRYPT password]
file[.DMS]
- the output file which will contain the archived disk.
OPTIONS:
FROM Dev:
- Will read the disk from a different device. The default device is DF0:
(internal drive). You may choose any device as long as it has 80 tracks,
2 sides, 11 sectors/track, and 512 bytes per sector.
Examples: DF0:, DF1:, DF2:, DF3:, RAD:, FM0:, FF0:, etc.
TEXT filetext
- Causes DMS to read in the file 'filetext' and add it to the archive.
When the archive is extracted the text will be displayed before writing
the disk. This is useful for identifying disks or giving other
information about the archive.
CMODE mode
- Chooses the compression mode used. Mode is either NONE, HEAVY1, HEAVY2,
or BEST
The default mode is BEST
Available modes are:
NONE - No Compression is performed (Straight Read).
HEAVY1 - Heavy compression, good speed/compression ratio.
HEAVY2 - Best available compression. Only available with >1meg ram.
BEST - Chooses Best compression method for available memory.
LOW lowtrack
- Specifies the starting track to read from. The default is track 0.
Lowtrack must be a value from 0 to 79.
HIGH hightrack
- Specifies the ending track to stop at. The default is track 79.
Hightrack must be a value from 0 to 79.
NOVAL
- Stops DMS from inhibiting the disk validator when reading the disk.
NOZERO
- Normally DMS will read the AmigaDOS bitmap from the disk and archive
only sectors which are being used. If the disk is a non-filing system
disk or has a bad bitmap, DMS will automatically archive the whole disk.
In EXTREME cases DMS will make a wrong assumption about the type of
disk it is archiving. NOZERO will cause DMS to archive the whole disk
totally ignoring the disk bitmap. Generally you will rarely if ever
have to use this option.
ENCRPYT password
- Causes DMS to encrypt the input from the disk using the password
supplied. 'password' is any alphanumeric word you desire.
Examples: Joe, Fred, ABC1234, ONLY-FOR-ME, etc.
EXAMPLES:
DMS read disk1
- Will compress a disk from drive DF0: using the default compression mode
and store the results in the file 'disk1.DMS'
DMS read stuff.DMS lowtrack 20
- Will compress only tracks 20 to 79 into file 'stuff.DMS'
DMS read stuff lowtrack 40 hightrack 40
- Will compress only track 40 into file 'stuff.DMS'
DMS read stuff from df1: cmode heavy1 noval nozero text RAM:intro
- Will compress a disk from drive DF1: using compression mode HEAVY1, not
inhibiting the disk validator, not using the disk bitmap and adding
the text from file 'RAM:intro' to the file 'stuff.DMS'
DMS read stuff.DMS from RAD: encrypt JOESTUFF1
- Will compress a disk from ram drive RAD: and encrypting the output
with the password 'JOESTUFF1' to file 'stuff.DMS'
DMS read stuff.DMS text CON:0/0/640/200/window
- Will compress a disk and allow you to quickly add text to the archive.
A console window will open up and you can then type any text you
want. To finish type CTRL \ to close the window and continue.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2.) WRITE
This command will uncompress and write a disk. The basic usage for this
command is:
DMS Write file[.DMS],,, [TO Dev:] [LOW lowtrack] [HIGH hightrack]
[NOVAL] [NOTEXT] [NOPAUSE] [DECRYPT password]
file[.DMS],,,
- One or more input files to be extracted. Standard AmigaDOS wildcards
are supported.
OPTIONS:
TO Dev:
- Will write the output to device Dev: (the default is drive DF0:)
The device must follows the same rules as in the READ command.
LOW lowtrack
- Specifies the starting track to write from. Tracks before lowtrack
will be ignored. Default is track 0
HIGH hightrack
- Specifies the ending track to write from. Tracks after hightrack
will be ignored. Default is track 79
NOVAL
- Stops DMS from inhibiting the disk validator when writing a disk.
NOTEXT
- Causes DMS to ignore any text to be displayed from the archive.
NOPAUSE
- Stops DMS from pausing after displaying any text from the archive.
DECRPYT password
- Causes DMS to decrypt the archive with the password 'password'.
This is only used if the archive was previously encrypted. 'password'
must be the EXACT same one used when encrypting the file otherwise
the archive will not be processed correctly.
EXAMPLES:
DMS write stuff
- Will extract the archive stuff.DMS to drive DF0:
DMS write part1 part2.dms TO DF2: NOTEXT
- Will extract the archives part1.DMS and part2.DMS to drive DF2: ,
ignoring any banner text in the archives
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
3.) REPACK
This command allows you to recompress an older DMS archive. It can also
be used as a simple split utility. T