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- COPYRIGHT NOTICE
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- Magic Shadow Archiver hereafter referred to as MSA is Copyright
- (C) 1987 by Steve Feinstein. MSA is distributed under the User
- Supported software or 'Shareware' concept. If you find this program
- useful and decide to keep and use it please compensate the author for
- his efforts and register by sending a check or money order for the sum
- of $10.00 to:
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- Steve Feinstein
- 56-26 244 Street
- Douglaston, New York
- 11362
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- MSA may be copied and distributed freely provided it is not
- modified and this documentation is included along with the two program
- files.
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- MSA may not be included with any other product for any reason
- whatsoever without the written permission of the author.
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- No charge may be levied for a disk containing MSA except for a
- disk handling charge of up to $8.00.
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- With all the various emulations that are being implemented on the
- ST the need for a means of transferring or storing data contained on
- disks of the various system formats, easily, from TOS has become a
- necessity. MSA is an attempt to satisfy this need.
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- Though all precautions have been taken to insure that MSA will
- function properly the author cannot accept any responsibility for any
- damages that may result from it's use or missuse.
-
- Please report any bugs and/or suggestions by dropping a note to the
- above address.
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- T h e M a g i c S h a d o w A r c h i v e r
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- MSA creates an image file of any unprotected disk that contains
- 512 byte sectors and writes it to a standard ST file using a simple
- track compression algorithm. This includes disks written under:
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- Atari ST/TOS
- Magic Sac
- IBM/MS-DOS
- CP/M
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- This means you can store or backup and then re-create any
- unprotected disk of various operating systems directly from the ST
- desktop. For instance bulletin boards can now easily handle files of
- entire Public Domain, Share Ware or Demo program disks in Magic Sac,
- IBM, TOS and other formats which can be Up/Downloaded and then restored
- to their original form ready to use with all boot sectors, roots and
- subdirectories intact.
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- Using MSA
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- STORING A DISK - To create an MSA archive file just boot MSA.PRG and
- after the functions panel appears place the disk you want to archive
- into the source drive A or B (this may be set using the buttons in the
- 'Drive' box at lower right off the panel - the default is drive A). To
- enter a name for your MSA archive file and set the destination
- drive/partition click on the long rectangular box at the bottom of the
- main panel and a standard GEM directory box will appear. Click on OK
- when you are finished making your entries. The name FILENAME.MSA will
- be used if you neglect to enter your own filename.
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- At this point you can click on the 'Do it!' button and MSA will
- start off by checking the source disk's format and display how many
- sides, tracks and sectors per track in the 'Information' area. MSA
- will then continue by reading each track of the source disk writing to
- the destination drive/file as it goes. To the right of 'Information'
- area you will see four fields that display the track being
- read/written, the side, the status of the operation (will show error
- codes if they occur) and the compression effectiveness for each track.
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- When the archiving operation is finished you will be presented
- with a box showing the size of the original disk, the size of the MSA
- file and the total compression acheived. This file now contains an
- image of your disk including the format information that will be used
- by the 'AUTO-FORMAT' function to re-create it.
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- Re-creating A Disk From an MSA File
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- To re-create a disk from a stored MSA file place a blank disk into
- the destination drive (set A or B by using the 'Drive' box at the lower
- right of the main panel) and click on the 'DISK -> FILE' button at the
- lower left of the panel. This will change the button's markings to
- 'FILE -> DISK' and the 'AUTO-FORMAT' button to the right will become
- enabled. Enter the name of your stored MSA file and source drive that
- you will be restoring from by clicking on the filename box at the
- bottom of the panel. Now click on 'Do it!'. MSA will format and
- create a new disk which should be an exact image of the original.
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- Features
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- There are a number of user selectable or editable options that you
- will find useful when using MSA.
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- ANALYZE - The 'Analyze' button allows you to check the format of a
- source disk before actually creating an MSA archival file. Place your
- source disk in the selected drive (A or B) and click on 'Analyze'.
- The number of sides, number of tracks and sectors per track will be
- displayed in the 'Information' area.
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- MSA uses this function automatically (unless the 'Override' button is
- set) when creating an archive file. The 'ANALYZE' feature works on
- most standard formats used in the above operating systems. MSA will
- 'Automatically' copy and restore disks within these format ranges:
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- Single/Double sided
- 80 tracks or more per side
- 8 or more sectors per track (512 bytes per sector)
- (11 [or more] sector destination disks must be
- pre-formatted.)
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- Since the operating speed of MSA was of major concern the analysis
- was kept within these ranges. (Forty track IBM disks may be set using
- the 'Override' button.) Because MSA is intended to work on different
- system disks the format analysis is made of the physical track/sector
- format of the disk and not through the system format data on the disk.
- Disks that have been formatted and reformatted with various capacities
- or systems can fool MSA into doing the wrong thing. Usually you will
- end up with an unecessarily large file but care must be taken to insure
- that these messy disks are stored properly by using the 'Override'
- feature and entering the format parameters manually.
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- Compression
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- At this time MSA uses a rather rudimentary data compression
- algorythm. It simply checks for strings of contiguous bytes of similar
- value and stores them in short encripted form.
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- Disks containing many empty sectors or repeated bytes (such as
- graphics files) will result in the smallest files. You can further
- compress your MSA files by using other compression programs such as
- arc.ttp, arca.ttp, etc. Note: smaller systems may not be able to arc
- the larger files created by MSA as with double sided disk files. These
- disks may be stored in segments or sections. i.e. tracks 0-39 as
- FILE_A.MSA and 40-79 as FILE_B.MSA on a DS/80 track disk.
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- Segmenting A Disk Image
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- To break a disk down into multiple MSA files click on and 'select'
- the 'Override' button before you start the archival operation. Then set
- the starting and ending tracks by clicking on the 'Tracks:' field.
- Change the starting and ending tracks to your needs and after placing
- the source disk in the drive proceed normally by clicking on the 'Do
- it!' button. Remember to use descriptive names for each section of the
- disk saved (for your own reference). MSA handles all the rest. MSA's
- 'Auto-Format' feature will restore each section to it's proper position
- on the disk when recreating the disk. Sequence is not important.
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- The Manual Override Button
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- The auto-analyze feature can be toggled off by clicking on the
- 'Override' button. This will deselect this feature. This is useful
- when storing disks that have previously been formatted as double sided
- but now contain single sided information. i.e. A disk that was used as
- a double sided TOS disk and then used as single sided Magic Sac disk
- containing ported Mac program files.
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- If MSA finds a second side on a single sided format it WILL copy
- it so use the 'Override' to set MSA for 1 side if that is all you want
- stored. An easy way to check is to use the 'Analyze' feature alone
- before you start actually storing the disk. This will tell you if MSA
- thinks there is a second side.
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- Aborting An Operation
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- Pressing and holding down either mouse button will abort a store
- or restore operation if you need to do so. When the disk is being
- checked with the 'Analyze' feature you must wait for it's completion
- before you can abort.
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- IBM or MS-DOS disks
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- MS-DOS or IBM program disks are usually double sided but often use
- only forty tracks (0-39). You can save time as well as avoid an
- oversized MSA file by manually setting MSA for 40 tracks. I'm sure
- that many PC-Ditto disks have previously lead lives as ST TOS disks.
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- Standard format for IBM or MS-DOS (v3.x) disks:
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- Tracks 40
- Sides 2
- Sectors 9
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- DOS system disks
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- IBM DOS system disks can be copied and restored with the system
- boot sectors and DOS version formats intact and ready to run. MSA may
- also be used with 5.25" drives.
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- Magic Sac disks
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- Magic Sac disk format is as follows:
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- Tracks 80
- Sectors 10
- Sides 1 or 2
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- One of MSA's most useful applications is the transferring of Magic
- Sac disks.
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- We feel that the Magic Shadow Archiver will quickly find a place
- in your utilities box as you discover more ways using it. Please feel
- free to drop us a note regarding any problems as well as suggestions
- for improvements.
-
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- Bill Kokoni
-