Hlp041

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Hlp041_101

This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.

Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.

Tape/disk:	Home » Recent acquisitions » Acorn ADFS disks » adfs_ArchimedesWorld_199204.adf » !ArcFS_ArcFSExtra
Filename:	Hlp041_101
Read OK:	✔
File size:	55F6 bytes
Load address:	0000
Exec address:	0000

Duplicates

There is 1 duplicate copy of this file in the archive:

Recent acquisitions » Acorn ADFS disks » adfs_ArchimedesWorld_199201.adf » !ArcFS_ArcFSExtra » Hlp041_101
Recent acquisitions » Acorn ADFS disks » adfs_ArchimedesWorld_199204.adf » !ArcFS_ArcFSExtra » Hlp041_101

!Help file for ArcFS version 0.41 / 1.01
by M.Smith
22nd August 1991

Many thanks to David Pilling, author of Spark and SparkPlug, for providing
me with the information to enable me to include support for Squashed (PK arc
compatible) and Compress formats. Spark is available directly from him,
currently for �5.99

ArcFS has filing system number 56. My thanks to Acorn for the allocation of
this filing system number and for the allocation of the SWI chunk base
(&437C0).

The version of ArcFSFiler supplied with this version of ArcFS (v0.21) should
work with all versions of Oak's SCSI Hard drive and may also work with all
versions of Ian Copestake Software's IDE Hard drive. I cannot test this
since I don't have either of these hard drives. Any feedback about this
would be most welcome.

ArcFS versions less than 1.00 are read-only, P.D. versions.

ArcFS allows the loading and opening of (compressed) files in archives
almost as easily as files on ADFS or RamFS. It has its own ArcFS filer
which displays the root directory in a filer window of any archive
which is double clicked. From then on files and applications may be
loaded as normal by double clicking them. Directories may be displayed
also by double clicking them. ArcFS can, of cause, also be used from
the command line.

You may notice a small increase in the time taken to load files
compared to loading files from ADFS and also that ArcFS takes a short
time to Open Spark compatible Archives when they are double clicked.

This version also supports a new archive format. It is much quicker to open
these new format archives than to open Spark compatible archives and the
read / write versions (1.00 and greater) can only write to and create new
format archives.

*****************************************************************************

ArcFS supports the following entry points:

FSEntry_Func 0 to set current directory (*Dir)

FSEntry_Func 1 to set library directory (*Lib)

FSEntry_Func 2 to catalogue directory (*Cat)

FSEntry_Func 3 to examine directory (*EX)

FSEntry_Func 4 to catalogue library directory (*LCat)

FSEntry_Func 5 to examine library directory (*LEX)

FSEntry_Func 6 to examine objects (*Info).

FSEntry_Func 8 to rename objects (*Rename) - r/w version only

FSEntry_Func 9 to access objects (*Access) - r/w version only

FSEntry_Func 11 to read name of archive containing the CSD (OS_GBPB 5)

FSEntry_Func 12 to read CSD name (OS_GBPB 6)

FSEntry_Func 13 to read Lib. name (OS_GBPB 7)

FSEntry_Func 14 to read dir. entries (OS_GBPB 8/9)

FSEntry_Func 15 to respond to requests from the Filer for
the necessary information to display a directory window

FSEntry_Func 16 to close all archives on a Shut down

FSEntry_Func 19 to read directory entries & information

FSEntry_Func 20 to give full information on objects (*FileInfo)

FSEntry_File 0 to save files - r/w version only

FSEntry_File 1-4 to write catalogue information - r/w version only

FSEntry_File 5 to read catalogue information on a file

FSEntry_File 6 to delete objects - r/w version only

FSEntry_File 7 to create files - r/w version only

FSEntry_File 8 to create directories - r/w version only

FSEntry_File 255 to load files

FSEntry_Open to provide facilities for opening files for
random access input (and output for r/w version). ArcFS claims memory
from the R.M.A. the size of the uncompressed file and the loads the file
into this claimed memory. For this reason it is possible to
get 'No Room in RMA errors' when opening large files.

FSEntry_GetBytes reads required bytes from memory claimed
by FSEntry_Open

FSEntry_PutBytes writes required bytes to memory claimed by FSEntry_Open
extending it if necessary.

FSEntry_Args 3,4,7,8,9 is supported for operations on files open for
update - r/w version only

FSEntry_Close releases memory claimed by FSEntry_Open (and writes the
data back to the file if open for update)

*****************************************************************************

Catalogue Storage in memory

When an archive is opened the number of objects in the archive is
counted and a block of R.M.A., 36 bytes for each object is claimed and
the catalogue information is read into this block.

*****************************************************************************

Compression formats

This version of ArcFS supports crunched, packed, new format stored
objects, squashed and compressed objects. Objects in a format that
ArcFS cannot handle will give 'Can't handle archive' errors when you
attempt to load them. Archives containing old format stored objects cannot
be opened.

Memory requirements

No. of bits compression Spark formats Memory requirement

12 bits Crunch, Compress 12 Just over 16K
13 bits Squash, Compress 13 Just over 32K
14 bits Compress 14 Just over 64K
15 bits Compress 15 Just over 128K
16 bits Compress 16 Just over 256K

The above table shows the requirements for free memory in order to load each
of the available formats. Using 16 bit compression formats can cause
problems when trying to load such files on a 1Mbyte machine.

*****************************************************************************

Simultaneously open archives

This version of ArcFS supports up to five archives open at any one time.
Each archive must be refered to by a unique name (usually, but not
necessarily, the leaf name of the archive). This is name is provided when
the archive is opened using *OpenArchive and can then be included in the
special field to refer to that specific archive. The ArcFS Filer uses the
leaf name of the archive as the name.

*****************************************************************************

Screen Output format

Screen Output follows that of Filecore as closely as possible. *FileInfo
gives a totaly different output to that of Filecore.

*FileInfo

*FileInfo displays the complete Header information held in memory about
files. The output of *FileInfo is as follows:

Name LWR/wr ff format bb llllllll aaaaaaaa eeeeeeee cccccccc pppppppp rr%

where:

Name is the object leafname

LWR/wr are the object attributes

ff is the Header Version Number (represents the compression format)

format is the type of data compression (always store for directories)

bb is the number of bits for crunch or compress formats (-- otherwise)

llllllll is the full object length (for directories this is the total
compressed size of all objects contained in it.)

aaaaaaaa is the load address

eeeeeeee is the execute address

cccccccc is the compressed file size.It equals the full length for stored
objects.

pppppppp This depends on whether the object is a file or directory. For a
file it is the position in the archive file at which the file
data begins. For directories this is the memory address at which
the next header in the parent directory exists (not very useful,
but used internally by ArcFS).

rr% This is the compression ratio, i.e. the compressed file size
expressed as a percentage of the original.

*****************************************************************************

File Attributes

The CRC is stored in the top 16 bits and the no. of bits compression (where
appropriate) is stored in the next 8 bits. File access rights are stored in
the bottom 8 bits. (N.B. the top 24 bits were used to store the compressed
file length in previous versions.)

*****************************************************************************

User Root Directories (U.R.D.'s)

Now supported. Use *URD to select the user root (&) directory. If the URD is "unset" then the root ($) directory is used instead.

The previously selected directory (P.S.D.)

Now supported. When a new directory selection is made, the old one becomes
the P.S.D. Use *Back to swap the C.S.D. and P.S.D. The P.S.D. can be
specified at the begining of a pathname as \. If the PSD is "unset" then the CSD is used instead (this may change so don't rely on it).

Automatic library selection

If ArcFS finds a directory starting with the letters 'Lib' in the root
directory of an archive when it is open it selects this as the library
directory.

Unset Directory contexts

If the PSD or library are used but are "unset" then the CSD is used instead.
If the URD is "unset" then the root is used instead. If the CSD is "unset"
and the user tries to perform operations on the current directory (or
current archive) the an error will be generated.

If the CSD is "unset" and an archive is opened, the CSD will automatically
be set the root directory of the new archive.

*****************************************************************************

Random access filing

Files are decompressed and held in R.M.A. whilst they are open. You should
note that when sprite files are loaded they are opened for random access
input and therefore there needs to be enough free memory available when the
sprites are loaded. This may cause problems when large sprite files are
loaded into a 1 Mbyte machine (anyone with an unexpanded A305 - don't
bother!) but I cannot really suggest anything short of upgrading to 2
Mbytes (other than making sure that all the possible free memory is
available to the R.M.A.). When I bought my 2Mbyte RAM upgrade in Dec. 1989
it cost �150 +VAT. Now it can cost as little as a third of that price and is
still falling. I have found it very useful and can recommend it to any users
of 1 Mbyte A3000's and A410's who use their computers for more than just
arcade games. Other files such as Exec and Obey files are also opened for
random access input but these are usually short.
A maximum of five files may be open for update with the r/w version (BASIC's
OPENUP and OPENOUT) but there is no limit to the number of files open for
input only (BASIC's OPENIN).

*****************************************************************************

Use with 65Host and 65Tube

ArcFS can easily be used with 65Host and 65Tube. 65Host users must open the
required archive(s) before entering the emulator under which ArcFS is
selected by:

*Dir ArcFS:

DFS emulations may also be set up in archives (as on ADFS) and used
under 65Host

*****************************************************************************

PC Format

Files archived using PC Format in Spark or archived using SEA arc or PK arc
on a PC all have file type &111.

*****************************************************************************

Directory levels

Up to 64 directory levels are supported. In the unlikely event that more
exist in an archive further subdirectories are shown as archives. This limit does not apply to new format archives.

*****************************************************************************

Commands provided:

*ArcFS - selects ArcFS as the current filing system
*OpenArchive <Object> <name> - Opens an archive for file operations
*CloseArchive [<name>] - Closes the named (or any) open archive(s)
*CreateArchive <Object> - Creates an archive (r/w version only)

Filing system commands:

*Back - swaps the currently and previously selected directories (CSD and PSD)
*URD - selects the user root directory (URD)
*Garble <PassWord> - Loads files garbled with a password
*NoEncryption - Loads files with no encryption
For r/w version only:
*Compact [<archive name.>] - Removes gaps left by deletions / overwrites
*Store - Sets no compression
*Pack - Sets compression of rptd. chars. only
*Crunch [<no. bits>] - Sets file crunching with no. bits (or 12)
*Compress [<no. bits>] - Sets file compress with no. bits (or 12)

*****************************************************************************

File encryption

This version supports garbled files. Incorrect passwords, use of Garble for
files with no encryption or trying to load garbled files having set ArcFS to
load files with no encryption will result in a 'Wrong password / Data
Corrupt' error. This will also occur if data in an archive becomes
corrupted.

For Spark compatible (old format) archives containing crunched or compressed
files which are encoded, all files of these formats must be encoded with
passwords that have the same first letter. Encryption must be set with at
least the first letter of the password(s) before opening the archive
(otherwise the above error will occur). This is because ArcFS must be able
to decode the first byte of the data for these files to find out the no. of
bits of compression.

*****************************************************************************

Software Interrupts

The allocated SWI chunk base is &437C0.
-----------------------------------------------------------------------------
SWI "ArcFS_ArchiveInfo" &437C0

On entry: R0=archive number (0-4)

On exit : R0=pointer to archive name (null terminated)
� R1=pointer to archive pathname (null terminated)
R2=pointer to archive headers (internal use only)

This SWI gives the name and pathname of the archive whose number is given by
R0 on entry. If R0 points to a null string on exit then there is no open
archive with this number (i.e. an empty 'slot')
-----------------------------------------------------------------------------
SWI "ArcFS_Status" &437C1

On entry: -

On exit : R0=status

This returns the current status of ArcFS. At present only the bottom bit has
significance and this is set if file encryption is set to garble and unset
otherwise. Other bits are reserved for future expansion.
-----------------------------------------------------------------------------
SWI "ArcFS_OpenArchive" &437C2

On entry: R0=pointer to pathname (control terminated)
R1=pointer to name (control terminated)

On exit : R0 & R1 preserved

This SWI opens an archive. Possible errors are 'Too many archives open' or
'An archive with this name is already open'.
-----------------------------------------------------------------------------
SWI "ArcFS_CloseArchive" &437C3

On entry: R0=pointer to name (control terminated)

On exit : R0 prserved

This SWI closes an archive. Possible error is 'No archive with this name is
open'.
-----------------------------------------------------------------------------
SWI "ArcFS_Encryption" &437C4

On entry: R0=encryption method (none=0, garble=1)
R1=pointer to password (control termainated, up to 32 bytes)

On exit : R0 & R1 preserved

This SWI sets the encryption method and password used.
-----------------------------------------------------------------------------
SWI "ArcFS_Compression" r/w version only &437C5

On entry: R0=compression format (&82,&83,&88 or &FF)
R1=no. bits for &88 and &FF

On exit : R0 & R1 preserved

This SWI sets the data compression format to be used:
&82 Store
&83 Pack
&88 Crunch
&FF Compress
Possible errors are 'Bits range error' and 'Unknown compression format'
-----------------------------------------------------------------------------
SWI "ArcFS_CreateArchive" r/w version only &437C6

On entry: R0=pointer to pathname for new archive

On exit : R0 is preserved

This SWI creates (but does not open) a new archive.
-----------------------------------------------------------------------------
SWI "ArcFS_Compact" r/w version only &437C7

On entry: R0=pointer to archive name or 0

On exit : R0 is preserved

This SWI compacts the named archive (or that containing the CSD) to removed
gaps left by deletions and file overwrites.

*****************************************************************************

Errors

Error numbers are of the form &138xx where xx is as follows:

xx Error

01 ArcFS CSD is "Unset"
02 Can't handle this archive
03 This version of ArcFS is read only.... (self explanatory)
04 Wrong password / Data Corrupt
05 No archive with this name is open
06 Bits range error (outside range 12-16, used by read / write version only)
07 Unknown Compression format (used by read / write version only)
08 Version .... or .... required (your version of ArcFS is too old to handle
this archive)

80 Too many archives open
82 An archive with this name is already open
89 Archive read only (no write access or is locked, used by r/w version only)

A0 ArcFS in use (RMReinit ArcFS if it occurs repeatedly)
B4 Dir. not empty (read / write version only)
C0 Too many open files (more than 5 files open for update, r/w version only)
C3 Locked (read / write version only)
C4 Already exists (read / write version only)
C5 Types don't match (read / write version only)
D6 Not found

FF Internal filing error (should not occur)

In addition, errors may be generated by FileSwitch or by the filing system
on which an archive is based, e.g. Disc full errors from ADFS.

*****************************************************************************

ArcFS Filer

The ArcFS filer is a module task, provided so that directories may be
displayed in normal filer windows. Archives are opened by double clicking
them or dragging them to the ArcFS icon. The root directory of the most
recently opened archive may be displayed by clicking on the icon. A menu is
provided with four options (seven for the r/w version):

Encryption - Sets the encryption method and password (if any) that is used.
The subdirectory has options for no encryption and garble. DES
encryption is not available in this version and so is shaded.

Open '$' - Opens the root directory of an open archive, chosen from the
sub-menu.

Close arc - Closes an open archive, chosen from the sub-menu and all
directory windows of that archive.

Kill - Closes all the open archives, removes all arcfs directory
windows, Kills the ArcFS module, Quits the ArcFS Filer and Kills
the ArcFS Filer module.

Kill prompts for confirmation. Click on OK to Kill the modules or Cancel
otherwise. Note pressing escape has the same effect as clicking on OK.

In addition the r/w version provides the following options:

New arc - Provides a save box for creating new archives

Compact - Compacts an open archive (choose from sub-menu)

Compression- Use to set the compression method

*****************************************************************************

All comments and suggestions for future improvement are welcome but please
note that I cannot reply to letters without return postage and an addressed
envelope.

The address is:

Mr. M. Smith
Pen-y-dre,
Riverside Ave.,
Broxbourne,
Herts.,
EN10 6RD.

Between Monday 30th September and Friday 13th December 1991 and between
Monday 6th January and Friday 27th March 1992 inc. I can be reached more
quickly at:

Mr. M. Smith,
Chepstow Hall of Residence,
Room L14,
Brunel University,
Uxbridge,
Middlsex,
UB8 3PH.

Please do not send any post to reach this address after 27th March 1992 as I
will probably not receive it. Please be patient when waiting for replies as
I may not be able to reply immediately.

I would also, of course welcome details of any bugs discovered so that I can
correct them.

*****************************************************************************

Version Improvements

v0.20 First Release version
v0.21 Max number of directory levels increased from 16 to 64, some tidying
v0.22 Snowed in 8th Feb 91 so made extensive changes: URD and PSD now
supported. Commands *Back and *URD provided. *FileInfo command added.
Compression format removed from *Info and *EX output (now given by
*FileInfo). *Info & *FileInfo now give information on multiple
wildcarded files. Compressed file size now stored in the top 24 bits of
the file attributes. PC format files are now supported. Supplied with
new ArcFS Filer with icon and menu.
v0.23 Corrected 2 bugs - ArcFS did not release 16k of claimed memory when an
error occured during the load crunch routine. If you cancelled a
request from the load pack routine to insert a disk the request was
repeated a second time.
v0.30 Now added support for squashed and compressed formats. Also added
support for Garbled files, *Garble and *NoEncryption commands provided.
Comprehensive error checking checks for corrupted data and/or passwords
and file encryption methods inconsistent with those that have been set.
v0.40 Added support for multiple archives, new format archives, rewritten
ArcFS Filer as a module task. Also added SWI's. Corrected bugs such as
the one causing strange characters to appear in % compression ratios
(sometimes causing a crash when trying to give a ratio for very small
files). Not for P.D. distribution as I am still waiting for a SWI chunk
base allocation.
v0.41 Added support for FSEntry_Func 11,12,13,14 and 19. Will now work with
Impression (documents can be loaded without another copy of Impression
being loaded and !Impress can be loaded from an archive without
crashing). Tidied the error numbers (some now different) to give
allocations shown above. SWI chunk base allocation &437C0 received
from Acorn. New ArcFSFiler (v0.21) should work with older Oak SCSI and
ICS IDE hard drives

� 1991 M. Smith

00000000  21 48 65 6c 70 20 66 69  6c 65 20 66 6f 72 20 41  |!Help file for A|
00000010  72 63 46 53 20 76 65 72  73 69 6f 6e 20 30 2e 34  |rcFS version 0.4|
00000020  31 20 2f 20 31 2e 30 31  0a 62 79 20 4d 2e 53 6d  |1 / 1.01.by M.Sm|
00000030  69 74 68 0a 32 32 6e 64  20 41 75 67 75 73 74 20  |ith.22nd August |
00000040  31 39 39 31 0a 0a 4d 61  6e 79 20 74 68 61 6e 6b  |1991..Many thank|
00000050  73 20 74 6f 20 44 61 76  69 64 20 50 69 6c 6c 69  |s to David Pilli|
00000060  6e 67 2c 20 61 75 74 68  6f 72 20 6f 66 20 53 70  |ng, author of Sp|
00000070  61 72 6b 20 61 6e 64 20  53 70 61 72 6b 50 6c 75  |ark and SparkPlu|
00000080  67 2c 20 66 6f 72 20 70  72 6f 76 69 64 69 6e 67  |g, for providing|
00000090  0a 6d 65 20 77 69 74 68  20 74 68 65 20 69 6e 66  |.me with the inf|
000000a0  6f 72 6d 61 74 69 6f 6e  20 74 6f 20 65 6e 61 62  |ormation to enab|
000000b0  6c 65 20 6d 65 20 74 6f  20 69 6e 63 6c 75 64 65  |le me to include|
000000c0  20 73 75 70 70 6f 72 74  20 66 6f 72 20 53 71 75  | support for Squ|
000000d0  61 73 68 65 64 20 28 50  4b 20 61 72 63 0a 63 6f  |ashed (PK arc.co|
000000e0  6d 70 61 74 69 62 6c 65  29 20 61 6e 64 20 43 6f  |mpatible) and Co|
000000f0  6d 70 72 65 73 73 20 66  6f 72 6d 61 74 73 2e 20  |mpress formats. |
00000100  53 70 61 72 6b 20 69 73  20 61 76 61 69 6c 61 62  |Spark is availab|
00000110  6c 65 20 64 69 72 65 63  74 6c 79 20 66 72 6f 6d  |le directly from|
00000120  20 68 69 6d 2c 0a 63 75  72 72 65 6e 74 6c 79 20  | him,.currently |
00000130  66 6f 72 20 a3 35 2e 39  39 0a 0a 41 72 63 46 53  |for .5.99..ArcFS|
00000140  20 68 61 73 20 66 69 6c  69 6e 67 20 73 79 73 74  | has filing syst|
00000150  65 6d 20 6e 75 6d 62 65  72 20 35 36 2e 20 4d 79  |em number 56. My|
00000160  20 74 68 61 6e 6b 73 20  74 6f 20 41 63 6f 72 6e  | thanks to Acorn|
00000170  20 66 6f 72 20 74 68 65  20 61 6c 6c 6f 63 61 74  | for the allocat|
00000180  69 6f 6e 20 6f 66 0a 74  68 69 73 20 66 69 6c 69  |ion of.this fili|
00000190  6e 67 20 73 79 73 74 65  6d 20 6e 75 6d 62 65 72  |ng system number|
000001a0  20 61 6e 64 20 66 6f 72  20 74 68 65 20 61 6c 6c  | and for the all|
000001b0  6f 63 61 74 69 6f 6e 20  6f 66 20 74 68 65 20 53  |ocation of the S|
000001c0  57 49 20 63 68 75 6e 6b  20 62 61 73 65 0a 28 26  |WI chunk base.(&|
000001d0  34 33 37 43 30 29 2e 0a  0a 54 68 65 20 76 65 72  |437C0)...The ver|
000001e0  73 69 6f 6e 20 6f 66 20  41 72 63 46 53 46 69 6c  |sion of ArcFSFil|
000001f0  65 72 20 73 75 70 70 6c  69 65 64 20 77 69 74 68  |er supplied with|
00000200  20 74 68 69 73 20 76 65  72 73 69 6f 6e 20 6f 66  | this version of|
00000210  20 41 72 63 46 53 20 28  76 30 2e 32 31 29 20 73  | ArcFS (v0.21) s|
00000220  68 6f 75 6c 64 0a 77 6f  72 6b 20 77 69 74 68 20  |hould.work with |
00000230  61 6c 6c 20 76 65 72 73  69 6f 6e 73 20 6f 66 20  |all versions of |
00000240  4f 61 6b 27 73 20 53 43  53 49 20 48 61 72 64 20  |Oak's SCSI Hard |
00000250  64 72 69 76 65 20 61 6e  64 20 6d 61 79 20 61 6c  |drive and may al|
00000260  73 6f 20 77 6f 72 6b 20  77 69 74 68 20 61 6c 6c  |so work with all|
00000270  0a 76 65 72 73 69 6f 6e  73 20 6f 66 20 49 61 6e  |.versions of Ian|
00000280  20 43 6f 70 65 73 74 61  6b 65 20 53 6f 66 74 77  | Copestake Softw|
00000290  61 72 65 27 73 20 49 44  45 20 48 61 72 64 20 64  |are's IDE Hard d|
000002a0  72 69 76 65 2e 20 49 20  63 61 6e 6e 6f 74 20 74  |rive. I cannot t|
000002b0  65 73 74 20 74 68 69 73  0a 73 69 6e 63 65 20 49  |est this.since I|
000002c0  20 64 6f 6e 27 74 20 68  61 76 65 20 65 69 74 68  | don't have eith|
000002d0  65 72 20 6f 66 20 74 68  65 73 65 20 68 61 72 64  |er of these hard|
000002e0  20 64 72 69 76 65 73 2e  20 41 6e 79 20 66 65 65  | drives. Any fee|
000002f0  64 62 61 63 6b 20 61 62  6f 75 74 20 74 68 69 73  |dback about this|
00000300  0a 77 6f 75 6c 64 20 62  65 20 6d 6f 73 74 20 77  |.would be most w|
00000310  65 6c 63 6f 6d 65 2e 0a  0a 41 72 63 46 53 20 76  |elcome...ArcFS v|
00000320  65 72 73 69 6f 6e 73 20  6c 65 73 73 20 74 68 61  |ersions less tha|
00000330  6e 20 31 2e 30 30 20 61  72 65 20 72 65 61 64 2d  |n 1.00 are read-|
00000340  6f 6e 6c 79 2c 20 50 2e  44 2e 20 76 65 72 73 69  |only, P.D. versi|
00000350  6f 6e 73 2e 0a 0a 41 72  63 46 53 20 61 6c 6c 6f  |ons...ArcFS allo|
00000360  77 73 20 74 68 65 20 6c  6f 61 64 69 6e 67 20 61  |ws the loading a|
00000370  6e 64 20 6f 70 65 6e 69  6e 67 20 6f 66 20 28 63  |nd opening of (c|
00000380  6f 6d 70 72 65 73 73 65  64 29 20 66 69 6c 65 73  |ompressed) files|
00000390  20 69 6e 20 61 72 63 68  69 76 65 73 20 0a 61 6c  | in archives .al|
000003a0  6d 6f 73 74 20 61 73 20  65 61 73 69 6c 79 20 61  |most as easily a|
000003b0  73 20 66 69 6c 65 73 20  6f 6e 20 41 44 46 53 20  |s files on ADFS |
000003c0  6f 72 20 52 61 6d 46 53  2e 20 49 74 20 68 61 73  |or RamFS. It has|
000003d0  20 69 74 73 20 6f 77 6e  20 41 72 63 46 53 20 66  | its own ArcFS f|
000003e0  69 6c 65 72 20 0a 77 68  69 63 68 20 64 69 73 70  |iler .which disp|
000003f0  6c 61 79 73 20 74 68 65  20 72 6f 6f 74 20 64 69  |lays the root di|
00000400  72 65 63 74 6f 72 79 20  69 6e 20 61 20 66 69 6c  |rectory in a fil|
00000410  65 72 20 77 69 6e 64 6f  77 20 6f 66 20 61 6e 79  |er window of any|
00000420  20 61 72 63 68 69 76 65  20 0a 77 68 69 63 68 20  | archive .which |
00000430  69 73 20 64 6f 75 62 6c  65 20 63 6c 69 63 6b 65  |is double clicke|
00000440  64 2e 20 46 72 6f 6d 20  74 68 65 6e 20 6f 6e 20  |d. From then on |
00000450  66 69 6c 65 73 20 61 6e  64 20 61 70 70 6c 69 63  |files and applic|
00000460  61 74 69 6f 6e 73 20 6d  61 79 20 62 65 20 0a 6c  |ations may be .l|
00000470  6f 61 64 65 64 20 61 73  20 6e 6f 72 6d 61 6c 20  |oaded as normal |
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*
00003320  2a 2a 2a 2a 2a 2a 2a 2a  0a 0a 53 6f 66 74 77 61  |********..Softwa|
00003330  72 65 20 49 6e 74 65 72  72 75 70 74 73 0a 0a 54  |re Interrupts..T|
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00003370  2d 2d 2d 2d 2d 2d 2d 2d  2d 2d 2d 2d 2d 2d 2d 2d  |----------------|
*
000033b0  2d 2d 2d 2d 0a 53 57 49  20 22 41 72 63 46 53 5f  |----.SWI "ArcFS_|
000033c0  41 72 63 68 69 76 65 49  6e 66 6f 22 20 20 20 20  |ArchiveInfo"    |
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*
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000034e0  68 65 20 6e 61 6d 65 20  61 6e 64 20 70 61 74 68  |he name and path|
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00003590  6c 6f 74 27 29 0a 2d 2d  2d 2d 2d 2d 2d 2d 2d 2d  |lot').----------|
000035a0  2d 2d 2d 2d 2d 2d 2d 2d  2d 2d 2d 2d 2d 2d 2d 2d  |----------------|
*
000035e0  2d 2d 2d 0a 53 57 49 20  22 41 72 63 46 53 5f 53  |---.SWI "ArcFS_S|
000035f0  74 61 74 75 73 22 20 20  20 20 20 20 20 20 20 20  |tatus"          |
00003600  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
*
00003620  20 20 20 20 20 26 34 33  37 43 31 0a 0a 4f 6e 20  |     &437C1..On |
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000036f0  2e 20 4f 74 68 65 72 20  62 69 74 73 20 61 72 65  |. Other bits are|
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00003710  74 75 72 65 20 65 78 70  61 6e 73 69 6f 6e 2e 0a  |ture expansion..|
00003720  2d 2d 2d 2d 2d 2d 2d 2d  2d 2d 2d 2d 2d 2d 2d 2d  |----------------|
*
00003760  2d 2d 2d 2d 2d 2d 2d 2d  2d 2d 2d 2d 2d 0a 53 57  |-------------.SW|
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00003790  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
000037a0  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 26  |               &|
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00003820  4f 6e 20 65 78 69 74 20  3a 20 52 30 20 26 20 52  |On exit : R0 & R|
00003830  31 20 70 72 65 73 65 72  76 65 64 0a 0a 54 68 69  |1 preserved..Thi|
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000038b0  65 6e 27 2e 0a 2d 2d 2d  2d 2d 2d 2d 2d 2d 2d 2d  |en'..-----------|
000038c0  2d 2d 2d 2d 2d 2d 2d 2d  2d 2d 2d 2d 2d 2d 2d 2d  |----------------|
*
00003900  2d 2d 0a 53 57 49 20 22  41 72 63 46 53 5f 43 6c  |--.SWI "ArcFS_Cl|
00003910  6f 73 65 41 72 63 68 69  76 65 22 20 20 20 20 20  |oseArchive"     |
00003920  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
*
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000039d0  77 69 74 68 20 74 68 69  73 20 6e 61 6d 65 20 69  |with this name i|
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000039f0  2d 2d 2d 2d 2d 2d 2d 2d  2d 2d 2d 2d 2d 2d 2d 2d  |----------------|
*
00003a30  2d 2d 2d 2d 2d 2d 0a 53  57 49 20 22 41 72 63 46  |------.SWI "ArcF|
00003a40  53 5f 45 6e 63 72 79 70  74 69 6f 6e 22 20 20 20  |S_Encryption"   |
00003a50  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |                |
*
00003a70  20 20 20 20 20 20 20 20  26 34 33 37 43 34 0a 0a  |        &437C4..|
00003a80  4f 6e 20 65 6e 74 72 79  3a 20 52 30 3d 65 6e 63  |On entry: R0=enc|
00003a90  72 79 70 74 69 6f 6e 20  6d 65 74 68 6f 64 20 28  |ryption method (|
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*
00003b90  2d 2d 2d 2d 2d 2d 2d 2d  2d 2d 2d 0a 53 57 49 20  |-----------.SWI |
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00003bb0  6f 6e 22 20 20 20 20 20  20 20 20 20 20 20 72 2f  |on"           r/|
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00003c40  0a 4f 6e 20 65 78 69 74  20 3a 20 52 30 20 26 20  |.On exit : R0 & |
00003c50  52 31 20 70 72 65 73 65  72 76 65 64 0a 0a 54 68  |R1 preserved..Th|
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00003ca0  20 20 26 38 33 20 50 61  63 6b 0a 20 20 26 38 38  |  &83 Pack.  &88|
00003cb0  20 43 72 75 6e 63 68 0a  20 20 26 46 46 20 43 6f  | Crunch.  &FF Co|
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00003cd0  65 72 72 6f 72 73 20 61  72 65 20 27 42 69 74 73  |errors are 'Bits|
00003ce0  20 72 61 6e 67 65 20 65  72 72 6f 72 27 20 61 6e  | range error' an|
00003cf0  64 20 27 55 6e 6b 6e 6f  77 6e 20 63 6f 6d 70 72  |d 'Unknown compr|
00003d00  65 73 73 69 6f 6e 20 66  6f 72 6d 61 74 27 0a 2d  |ession format'.-|
00003d10  2d 2d 2d 2d 2d 2d 2d 2d  2d 2d 2d 2d 2d 2d 2d 2d  |----------------|
*
00003d50  2d 2d 2d 2d 2d 2d 2d 2d  2d 2d 2d 2d 0a 53 57 49  |------------.SWI|
00003d60  20 22 41 72 63 46 53 5f  43 72 65 61 74 65 41 72  | "ArcFS_CreateAr|
00003d70  63 68 69 76 65 22 20 20  20 20 20 20 20 20 20 72  |chive"         r|
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00003e30  2d 2d 2d 2d 2d 2d 2d 2d  2d 2d 2d 2d 2d 2d 2d 2d  |----------------|
*
00003e70  2d 2d 2d 2d 0a 53 57 49  20 22 41 72 63 46 53 5f  |----.SWI "ArcFS_|
00003e80  43 6f 6d 70 61 63 74 22  20 20 20 20 20 20 20 20  |Compact"        |
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*
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00004050  0a 30 33 20 54 68 69 73  20 76 65 72 73 69 6f 6e  |.03 This version|
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000040a0  2f 20 44 61 74 61 20 43  6f 72 72 75 70 74 0a 30  |/ Data Corrupt.0|
000040b0  35 20 4e 6f 20 61 72 63  68 69 76 65 20 77 69 74  |5 No archive wit|
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000041c0  0a 0a 38 30 20 54 6f 6f  20 6d 61 6e 79 20 61 72  |..80 Too many ar|
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000042c0  30 20 54 6f 6f 20 6d 61  6e 79 20 6f 70 65 6e 20  |0 Too many open |
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*
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00004a00  2a 2a 2a 2a 2a 2a 2a 2a  2a 2a 2a 2a 2a 2a 2a 2a  |****************|
*
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00004aa0  68 61 74 20 49 20 63 61  6e 6e 6f 74 20 72 65 70  |hat I cannot rep|
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00004b00  0a 0a 20 20 20 20 4d 72  2e 20 4d 2e 20 53 6d 69  |..    Mr. M. Smi|
00004b10  74 68 0a 20 20 20 20 50  65 6e 2d 79 2d 64 72 65  |th.    Pen-y-dre|
00004b20  2c 0a 20 20 20 20 52 69  76 65 72 73 69 64 65 20  |,.    Riverside |
00004b30  41 76 65 2e 2c 0a 20 20  20 20 42 72 6f 78 62 6f  |Ave.,.    Broxbo|
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00004b60  0a 42 65 74 77 65 65 6e  20 4d 6f 6e 64 61 79 20  |.Between Monday |
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00004bb0  36 74 68 20 4a 61 6e 75  61 72 79 20 61 6e 64 20  |6th January and |
00004bc0  46 72 69 64 61 79 20 32  37 74 68 20 4d 61 72 63  |Friday 27th Marc|
00004bd0  68 20 31 39 39 32 20 69  6e 63 2e 20 49 20 63 61  |h 1992 inc. I ca|
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00004c00  20 20 20 4d 72 2e 20 4d  2e 20 53 6d 69 74 68 2c  |   Mr. M. Smith,|
00004c10  0a 20 20 20 20 43 68 65  70 73 74 6f 77 20 48 61  |.    Chepstow Ha|
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*
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000051e0  20 20 20 20 20 20 43 6f  6d 70 72 65 68 65 6e 73  |      Comprehens|
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00005220  2f 6f 72 20 70 61 73 73  77 6f 72 64 73 0a 20 20  |/or passwords.  |
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00005240  72 79 70 74 69 6f 6e 20  6d 65 74 68 6f 64 73 20  |ryption methods |
00005250  69 6e 63 6f 6e 73 69 73  74 65 6e 74 20 77 69 74  |inconsistent wit|
00005260  68 20 74 68 6f 73 65 20  74 68 61 74 20 68 61 76  |h those that hav|
00005270  65 20 62 65 65 6e 20 73  65 74 2e 0a 76 30 2e 34  |e been set..v0.4|
00005280  30 20 41 64 64 65 64 20  73 75 70 70 6f 72 74 20  |0 Added support |
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000052a0  68 69 76 65 73 2c 20 6e  65 77 20 66 6f 72 6d 61  |hives, new forma|
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000052d0  53 20 46 69 6c 65 72 20  61 73 20 61 20 6d 6f 64  |S Filer as a mod|
000052e0  75 6c 65 20 74 61 73 6b  2e 20 41 6c 73 6f 20 61  |ule task. Also a|
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00005300  65 63 74 65 64 20 62 75  67 73 20 73 75 63 68 20  |ected bugs such |
00005310  61 73 0a 20 20 20 20 20  20 74 68 65 20 6f 6e 65  |as.      the one|
00005320  20 63 61 75 73 69 6e 67  20 73 74 72 61 6e 67 65  | causing strange|
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00005350  65 73 73 69 6f 6e 20 72  61 74 69 6f 73 0a 20 20  |ession ratios.  |
00005360  20 20 20 20 28 73 6f 6d  65 74 69 6d 65 73 20 63  |    (sometimes c|
00005370  61 75 73 69 6e 67 20 61  20 63 72 61 73 68 20 77  |ausing a crash w|
00005380  68 65 6e 20 74 72 79 69  6e 67 20 74 6f 20 67 69  |hen trying to gi|
00005390  76 65 20 61 20 72 61 74  69 6f 20 66 6f 72 20 76  |ve a ratio for v|
000053a0  65 72 79 20 73 6d 61 6c  6c 0a 20 20 20 20 20 20  |ery small.      |
000053b0  66 69 6c 65 73 29 2e 20  4e 6f 74 20 66 6f 72 20  |files). Not for |
000053c0  50 2e 44 2e 20 64 69 73  74 72 69 62 75 74 69 6f  |P.D. distributio|
000053d0  6e 20 61 73 20 49 20 61  6d 20 73 74 69 6c 6c 20  |n as I am still |
000053e0  77 61 69 74 69 6e 67 20  66 6f 72 20 61 20 53 57  |waiting for a SW|
000053f0  49 20 63 68 75 6e 6b 0a  20 20 20 20 20 20 62 61  |I chunk.      ba|
00005400  73 65 20 61 6c 6c 6f 63  61 74 69 6f 6e 2e 0a 76  |se allocation..v|
00005410  30 2e 34 31 20 41 64 64  65 64 20 73 75 70 70 6f  |0.41 Added suppo|
00005420  72 74 20 66 6f 72 20 46  53 45 6e 74 72 79 5f 46  |rt for FSEntry_F|
00005430  75 6e 63 20 31 31 2c 31  32 2c 31 33 2c 31 34 20  |unc 11,12,13,14 |
00005440  61 6e 64 20 31 39 2e 20  57 69 6c 6c 20 6e 6f 77  |and 19. Will now|
00005450  20 77 6f 72 6b 20 77 69  74 68 0a 20 20 20 20 20  | work with.     |
00005460  20 49 6d 70 72 65 73 73  69 6f 6e 20 28 64 6f 63  | Impression (doc|
00005470  75 6d 65 6e 74 73 20 63  61 6e 20 62 65 20 6c 6f  |uments can be lo|
00005480  61 64 65 64 20 77 69 74  68 6f 75 74 20 61 6e 6f  |aded without ano|
00005490  74 68 65 72 20 63 6f 70  79 20 6f 66 20 49 6d 70  |ther copy of Imp|
000054a0  72 65 73 73 69 6f 6e 0a  20 20 20 20 20 20 62 65  |ression.      be|
000054b0  69 6e 67 20 6c 6f 61 64  65 64 20 61 6e 64 20 21  |ing loaded and !|
000054c0  49 6d 70 72 65 73 73 20  63 61 6e 20 62 65 20 6c  |Impress can be l|
000054d0  6f 61 64 65 64 20 66 72  6f 6d 20 61 6e 20 61 72  |oaded from an ar|
000054e0  63 68 69 76 65 20 77 69  74 68 6f 75 74 0a 20 20  |chive without.  |
000054f0  20 20 20 20 63 72 61 73  68 69 6e 67 29 2e 20 54  |    crashing). T|
00005500  69 64 69 65 64 20 74 68  65 20 65 72 72 6f 72 20  |idied the error |
00005510  6e 75 6d 62 65 72 73 20  28 73 6f 6d 65 20 6e 6f  |numbers (some no|
00005520  77 20 64 69 66 66 65 72  65 6e 74 29 20 74 6f 20  |w different) to |
00005530  67 69 76 65 0a 20 20 20  20 20 20 61 6c 6c 6f 63  |give.      alloc|
00005540  61 74 69 6f 6e 73 20 73  68 6f 77 6e 20 61 62 6f  |ations shown abo|
00005550  76 65 2e 20 53 57 49 20  63 68 75 6e 6b 20 62 61  |ve. SWI chunk ba|
00005560  73 65 20 61 6c 6c 6f 63  61 74 69 6f 6e 20 26 34  |se allocation &4|
00005570  33 37 43 30 20 72 65 63  65 69 76 65 64 0a 20 20  |37C0 received.  |
00005580  20 20 20 20 66 72 6f 6d  20 41 63 6f 72 6e 2e 20  |    from Acorn. |
00005590  4e 65 77 20 41 72 63 46  53 46 69 6c 65 72 20 28  |New ArcFSFiler (|
000055a0  76 30 2e 32 31 29 20 73  68 6f 75 6c 64 20 77 6f  |v0.21) should wo|
000055b0  72 6b 20 77 69 74 68 20  6f 6c 64 65 72 20 4f 61  |rk with older Oa|
000055c0  6b 20 53 43 53 49 20 61  6e 64 0a 20 20 20 20 20  |k SCSI and.     |
000055d0  20 49 43 53 20 49 44 45  20 68 61 72 64 20 64 72  | ICS IDE hard dr|
000055e0  69 76 65 73 0a 0a a9 20  31 39 39 31 20 4d 2e 20  |ives... 1991 M. |
000055f0  53 6d 69 74 68 0a                                 |Smith.|
000055f6

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