ARCHIMEDES ISO 9660 extension

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== Sample files ==
 
== Sample files ==
The extension is common on RISC OS CD-ROMS.
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The extension is common on RISC OS CD-ROMs.
 
* [https://archive.org/details/cdrom-riscos-apdl-pd2a APDL Public Domain CD 2] → APDL_PD2A.iso
 
* [https://archive.org/details/cdrom-riscos-apdl-pd2a APDL Public Domain CD 2] → APDL_PD2A.iso
  
 
[[Category:RISC OS]]
 
[[Category:RISC OS]]

Latest revision as of 19:48, 6 March 2019

File Format
Name ARCHIMEDES ISO 9660 extension
Ontology

This article covers an ISO 9660 extension that contains metadata specific to Acorn / Archimedes / RISC OS systems.

[edit] Format details

The extension is a 32-byte data element located in the "system use" area of each directory record. It begins with the signature "ARCHIMEDES".

According to a cdrtools patch [1], the format is:

0-9   "ARCHIMEDES"
10-13 Load address
14-17 Execution address
18-21 Attributes
22-31 Reserved

The load/execution/attributes fields are 32-bit little-endian integers. Following a RISC OS convention, the load/execution fields usually contain the file type and a timestamp. It is comparable to the ZIP "AC" extensible data field, for example.

Attributes bit 0x100 indicates that the original filename began with a "!" character.

[edit] Sample files

The extension is common on RISC OS CD-ROMs.

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