home *** CD-ROM | disk | FTP | other *** search
-
- ______ GHOST.PRG _____________________________________ 01 Mars 1992 __
-
-
- Formatter and copier for ALADIN╛, SPECTRE╛ and MACINTOSH╛ diskettes.
-
- Author: Miguel SARO
-
-
- NOTICE: The author has placed this programme in the Public Domain in the
- hope that you will find it useful, but he cannot give any
- guarantee as to its reliability (in other words use it at your
- own risk). It was developped using SOZOBON C and GULAM (many
- thanks to their respective authors). No version number has been
- assigned to it, simply a creation date it used.
-
-
- The programme is mainly aimed at SPECTRE users who wish to convert
- files from the now defunct ALADIN format. Although SPECTRE 3.0 (the
- latest version at the time of writing) allows you to read the old 9-
- sector 696k ALADIN discs directly under MAC emulation this is only true
- if your MAC system does not reside on a SPECTRE-format floppy (as is the
- case for SPECTRE 128 owners without a hard disc). SPECTRE becomes
- confused between the 9 and 10 sector formats that it has to deal with
- simultaneously. So ALASPEC (the predecessor to GHOST) was born to
- convert between the two formats under GEM.
- The problem of exchanging files between SPECTRE 128 (no GCR
- capability) and a real MAC, however, still remained. GHOST resolves this
- by making use of the fact that all MACs with High Density drives (e.g.
- the MAC Classic, MAC LC, MAC II's etc) can handle discs written using
- MFM (Modified Frequency Modulation) so that MS-DOS discs can be read
- using Apple File Exchange. It just so happens that if the MFM diskette
- contains a valid MACINTOSH file structure (MFS or HFS) then it can read
- and written directly by the MAC. The diskette does however have to be
- formatted using 9 sectors per track (720k max) with information being
- successively written on one side and then the other as each track fills
- up. SPECTRE-format diskettes do no however use this arrangement, they
- first fill up one side of the diskette and the fill up the other side,
- as well as having 10 sectors per track (800k max).
- GHOST converts diskettes between these two formats. Obviously you
- cannot squeeze a 800k SPECTRE diskette into a 720k MFM diskette, but if
- the top 160 sectors of the SPECTRE diskette do not contain any useful
- information nothing will be lost in the conversion. You can usually make
- sure this is true. Should individual files be too big to be contained on
- a 720k diskette they can split into two or more smaller ones using
- something like Stuffit.
- What follows is a very brief list of the capabilities of GHOST but
- should be sufficient to use it without any trouble.
-
-
- ____Format Information:
-
- Only double-sided MFM diskettes can be handled by GHOST which treats
- them according to their physical structure rather than their contents:
-
- __TYPE___| tracks sectors organisation capacity
- ALADIN | 79 9 alternating sides 696k (1)
- MAC_MFM | 80 9 alternating sides 720k
- ALADIN v3| 80 10 alternating sides 800k
- SPECTRE | 80 10 successive sides 800k
-
- (1) - The first track on each side is reserved for GEM.
-
- ____Settings:
-
- Drives : A, B(if it exists)
- Types : ALADIN, Mac_MFM, ALADIN version 3, SPECTRE
- Capacities : 696k, 720k, 800k.
- Modes : MFS(Macintosh File System), HFS(Hierarchical File System)
-
- ____Operation:
-
- Start the programme under GEM in the usual way (it does not use
- either of the emulators). Click on the various boxes shown in the
- display window to correspond the the required operation.
-
- For "COPY" and "FORMAT & COPY"
- You have to chose the structure of the source diskette and that
- required for the destination. The capacity of the destination
- has to be limited to that of the source.
-
- For "FORMAT"
- You have to chose the structure of the diskette to be formatted
- as well as its capacity and logical organisation.
-
- If you click on the "?" for either of the diskettes it will try
- to determine the structure of that diskette. If it displays
- "ALv3_SPct" it means that it cannot tell whether it is an ALADIN
- version 3 diskette or a SPECTRE diskette.
-
- Click on the operation to be perfomed.
-
- The programme will never refuse the requested operation, but the
- result obtained depends on how accurately the settings were chosen.
- It is possible to copy a SPECTRE 800k diskette to a 696k ALADIN
- one!! - you will lose the excess and the MAC system will ask you if
- you want repair the diskette.
-
-
- The programme has dialogues in both English & French (since the
- author is French):
-
- ____To change language: (French/English)
-
- While running : click on "Help/Aide" at the top right of the
- window then on "Continue", on the next screen
- click on either "Francais" or "English" to chose
- that one. Click on "Return/Retour"
- Changing default : while on the second screen described above,
- clicking on "set default lang." will save the
- current setting to the programme itself so that
- it will be this language used when it is next
- re-started.
-
- ___ I wish to thank my friends: Yves LAGARDE for his suggestions after
- testing and Paul DAGLEISH for the same reason but also for his
- translation into English of the programma dialogue and this documen-
- tation (you're welcome - PD :-) ).
-
- ___ If you have any comments or wish to contact me please write to me at
- the following address (I don't have access to the net) :
-
- M. SARO
- Help Informatique
- 7, rue de Strasbourg
- 38000 GRENOBLE
- France.
-
-