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Volume Header
ksherlock edited this page Apr 23, 2015
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This is the volume directory, as originally defined in ProDOS/SOS.
| Name | Offset | Size |
|---|---|---|
| storage_type | $00 | 4 bits (high) |
| name_length | $00 | 4 bits (low) |
| file_name | $01 | 15 bytes |
| reserved | $10 | 8 bytes |
| creation | $18 | 4 bytes |
| version | $1c | 1 byte |
| min_version | $1d | 1 byte |
| access | $1e | 1 byte |
| entry_length | $1f | 1 byte |
| entries_per_block | $20 | 1 byte |
| file_count | $21 | 2 byte |
| bit_map_pointer | $23 | 2 bytes |
| total_blocks | $25 | 2 bytes |
- Part of the reserved data is used to store the modification date. This is not documented but is reportedly specific to the GS/OS ProDOS FST.
- Part of the reserved data is used to store
file_namecase information as of IIgs System 5. Refer to GS/OS Technote #8.
| Name | Offset | Size |
|---|---|---|
| storage_type | $00 | 4 bits (high) |
| name_length | $00 | 4 bits (low) |
| file_name | $01 | 15 bytes |
| reserved | $10 | 2 bytes |
| last_mod | $12 | 4 bytes |
| file_name_case_bits | $16 | 2 bytes |
| creation | $18 | 4 bytes |
| version | $1c | 1 byte |
| min_version | $1d | 1 byte |
| access | $1e | 1 byte |
| entry_length | $1f | 1 byte |
| entries_per_block | $20 | 1 byte |
| file_count | $21 | 2 byte |
| bit_map_pointer | $23 | 2 bytes |
| total_blocks | $25 | 2 bytes |