The operating system identity byte is the first byte in the Chunk Directory entry. It is formed of two nybbles:
High Nybble Low Nybble Meaning
(bits 7-4) (bits 3-0)
8 Acorn OS 0: Arthur/RISC OS
0 Loader
1 Relocatable Module
2 BBC ROM
3 Sprite
4 File (generic)
9 Acorn OS 1: ARX
0 Loader
10 Acorn OS 2: RISCiX
0 Loader
11 Acorn OS 3: Helios
0 Loader
14 manufacturer defined
0-15 manufacturer specific
15 Device data
0 link (points to another directory)
1 serial number (string)
2 date of manufacture (string)
3 modification status (string)
4 place of manufacture (string)
5 description (string)
6 part number (string)
7 ethernet EUI48 (6 bytes)
8 hardware revision (1 word)
9 cyclic redundancy check (2 or 4 bytes)
15 empty chunk
It is intended that the string values are for human inspection (rather than for programs to read). The first 'description' chunk encountered will be used in the listing for *PODULES and so is recommended as a minimum.
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