Micrognosis Compression Archiver - Revision history

Jsummers: /* Format details */

2021-04-25T14:55:26Z

‎Format details

Jsummers: /* Format details */

2020-10-16T13:53:32Z

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Jsummers at 16:11, 16 September 2020

2020-09-16T16:11:24Z

Jsummers: Created page with "{{FormatInfo |formattype=electronic |subcat=Archiving |released=1994? }} '''Micrognosis Compression Archiver''', sometimes called '''MAR''', is a compressed archive utility fo..."

2020-09-04T16:10:13Z

Created page with "{{FormatInfo |formattype=electronic |subcat=Archiving |released=1994? }} '''Micrognosis Compression Archiver''', sometimes called '''MAR''', is a compressed archive utility fo..."

New page

{{FormatInfo
|formattype=electronic
|subcat=Archiving
|released=1994?
}}
'''Micrognosis Compression Archiver''', sometimes called '''MAR''', is a compressed archive utility for DOS (and maybe other platforms?).

It's not clear who is responsible for it. Version 1.0 says:
Original Version By: Stratus VOS 11.5 Version by:
Haruhiko Okumura Richard Schiller

== Format details ==
MAR uses generalized [[LHA]] format, with some custom compression schemes.

{| class="wikitable"
! ID !! Description and remarks
|-
|<code>hf0</code> || Generic Huffman
|-
|<code>ah0</code> || Adaptive Huffman
|-
|<code>ari</code> || Arithmetic
|}

It also uses the standard "<code>lh0</code>" scheme, for uncompressed files.

The documentation lists more compression schemes, but they don't seem to be implemented:

{| class="wikitable"
! ID !! Description and remarks
|-
|<code>arn</code> || Arithmetic N
|-
|<code>lzs</code> || LZS IDX-12,13,14/LEN-3,4,5. (Don't know if this was intended to be the same as LArc's <code>lzs</code> scheme.)
|-
|<code>lzw</code> || LZW BIT-12,13,14/LZW-fix,var
|}

== Identifiers ==
The executable file is named "MAR.EXE". MAR does not seem to have a standard filename extension, though one might logically use '''.MAR'''.

== Software ==
* [https://www.sac.sk/download/pack/mar10.zip Micrognosis Compression Archiver v1.0]
** [http://mpolibbs.steptail.com/software/DOS/COMPRESS/MAR10.ZIP Another copy]

@@ Line 32: / Line 32: @@
 |<code>-arn-</code> || Arithmetic N
 |-
-|<code>-lzs-</code> || LZS IDX-12,13,14/LEN-3,4,5. (Don't know if this was intended to be the same as LArc's scheme of the same ID.)
+|<code>-lzs-</code> || LZS IDX-12,13,14/LEN-3,4,5. (Don't know if this was intended to be the same as [[LArc]]'s scheme of the same ID.)
 |-
 |<code>-lzw-</code> || LZW BIT-12,13,14/LZW-fix,var

@@ Line 16: / Line 16: @@
 ! ID !! Description and remarks
 |-
-|<code>hf0</code> || Generic Huffman
+|<code>-hf0-</code> || Generic Huffman
 |-
-|<code>ah0</code> || Adaptive Huffman
+|<code>-ah0-</code> || Adaptive Huffman
 |-
-|<code>ari</code> || Arithmetic
+|<code>-ari-</code> || Arithmetic
 |}
@@ Line 30: / Line 30: @@
 ! ID !! Description and remarks
 |-
-|<code>arn</code> || Arithmetic N
+|<code>-arn-</code> || Arithmetic N
 |-
-|<code>lzs</code> || LZS IDX-12,13,14/LEN-3,4,5. (Don't know if this was intended to be the same as LArc's <code>lzs</code> scheme.)
+|<code>-lzs-</code> || LZS IDX-12,13,14/LEN-3,4,5. (Don't know if this was intended to be the same as LArc's scheme of the same ID.)
 |-
-|<code>lzw</code> || LZW BIT-12,13,14/LZW-fix,var
+|<code>-lzw-</code> || LZW BIT-12,13,14/LZW-fix,var
 |}

@@ Line 6: / Line 6: @@
 '''Micrognosis Compression Archiver''', sometimes called '''MAR''', is a compressed archive utility for DOS (and maybe other platforms?).
-It's not clear who is responsible for it. Version 1.0 says:
+The software is a bit vague about who exactly is responsible for it. No doubt Haruhiko Okumura had a lot to do with it, but it would be nice to have independent confirmation of a connection between him and Micrognosis. The credits for version 1.0 say:
   Original Version By:           Stratus VOS 11.5 Version by:
     Haruhiko Okumura              Richard Schiller
 == Format details ==
-MAR uses generalized [[LHA]] format, with some custom compression schemes.
+MAR uses generalized [[LHA]] format, with some custom compression schemes:
 {| class="wikitable"