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Volume Header

ksherlock edited this page 2015-04-23 11:48:11 -04:00

Table of Contents

• Updates

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

Updates

• 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_name case 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