ArcMac

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(Created page with "{{FormatInfo |formattype=electronic |subcat=Archiving |extensions={{ext|arc}} |type code={{Type Code|mArc}} |released=≤1988 }} '''ArcMac''' format is a variant of the [[ARC ...")
 
 
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|extensions={{ext|arc}}
 
|extensions={{ext|arc}}
 
|type code={{Type Code|mArc}}
 
|type code={{Type Code|mArc}}
|released=≤1988
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|released=1988
 
}}
 
}}
 
'''ArcMac''' format is a variant of the [[ARC (compression format)|ARC]] compressed archive format, with extended features relevant to classic Macintosh computers. It is associated with the ''ArcMac'' software by Don Gilbert and dogStar Software.
 
'''ArcMac''' format is a variant of the [[ARC (compression format)|ARC]] compressed archive format, with extended features relevant to classic Macintosh computers. It is associated with the ''ArcMac'' software by Don Gilbert and dogStar Software.
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* '''xArcMac''' - Decompression-only software for DOS
 
* '''xArcMac''' - Decompression-only software for DOS
  
Some "ArcMac" or "ArcPop" distributions contain all three; others omit ArcMac.
+
Some "ArcMac" or "ArcPop" distributions don't contain all three.
  
 
The version numbers and release dates of these things, and of the included documentation, do not seem to have been updated consistently, and are difficult to make sense of.
 
The version numbers and release dates of these things, and of the included documentation, do not seem to have been updated consistently, and are difficult to make sense of.
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== Software ==
 
== Software ==
 
* [https://www.sac.sk/download/pack/macarc.zip xArcMac v1.1a]
 
* [https://www.sac.sk/download/pack/macarc.zip xArcMac v1.1a]
* {{CdTextfiles|garbo/MAC/ARCERS/ARCMACRC.BIN|ARCMACRC.BIN}} (ArcMac v1.2a?) - MacBinary-encoded (self-extracting?) ArcMac file  
+
* {{CdTextfiles|garbo/MAC/ARCERS/ARCMACRC.BIN|ARCMACRC.BIN}} - ArcMac v1.2a? ([[MacBinary]]-encoded (self-extracting?) ArcMac file)
 
* [https://www.macintoshrepository.org/25968-arcmac Macintosh Repository: "ArcMac"]
 
* [https://www.macintoshrepository.org/25968-arcmac Macintosh Repository: "ArcMac"]
 
* [https://macintoshgarden.org/apps/arcmac Macintosh Garden: "ArcMac v1.3"]
 
* [https://macintoshgarden.org/apps/arcmac Macintosh Garden: "ArcMac v1.3"]
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* [https://macgui.com/downloads/?file_id=37825 Mac GUI: "Arcpop"]
 
* [https://macgui.com/downloads/?file_id=37825 Mac GUI: "Arcpop"]
  
The extent to which ArcMac format is backward-compatible with ARC decompressors that are not ArcMac-aware is unclear. It can work in some limited cases, but is not reliable.
+
The extent to which ArcMac format is compatible with [[ARC (compression format)#Programs and Utilities|ARC decompressors]] that are not ArcMac-aware is unclear. It can work in some limited cases, but is not reliable.
  
 
[[Category:Macintosh]]
 
[[Category:Macintosh]]

Latest revision as of 23:37, 5 October 2020

File Format
Name ArcMac
Ontology
Extension(s) .arc
Type Code mArc
Released 1988

ArcMac format is a variant of the ARC compressed archive format, with extended features relevant to classic Macintosh computers. It is associated with the ArcMac software by Don Gilbert and dogStar Software.

Contents

[edit] Discussion

There are three applications:

  • ArcMac - The full software for Mac (shareware)
  • ArcPop - Decompression-only software for Mac
  • xArcMac - Decompression-only software for DOS

Some "ArcMac" or "ArcPop" distributions don't contain all three.

The version numbers and release dates of these things, and of the included documentation, do not seem to have been updated consistently, and are difficult to make sense of.

The documentation claims that the distribution includes source code for ArcPop and xArcMac, in a file named "MARCS.ARC". Unfortunately, we have not located such a file.

[edit] Identification

ArcMac files start with 0x1b, and have 0x1a at offset 59, as the start of an ARC-compatible header.

[edit] Specifications

  • Refer to the "ArcMac File Structure" section in the ArcMac2.Doc or ARCMAC.DOC file included with most ArcMac distributions.
  • macutil → macunpack/arc.h has some info (though macunpack does not support the format)

[edit] Software

The extent to which ArcMac format is compatible with ARC decompressors that are not ArcMac-aware is unclear. It can work in some limited cases, but is not reliable.

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