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Section A:
System interface
A.5.2. Time Stamps
For time stamps, special directory entries are required. The system does
not
create
them,
they have to be established by means of the
utility
program
$INITDIR.
These entries then occupy the last one of
the
four
directory entries per 128-bytes block. Such
?
"Time - FCB" is flagged by
a value of 33 in the user byte.· Beginning with the second byte,
groups
of 10 bytes each are reserved for each of the other three (normal files)
possible entries in the 128-bytes block.
This means that the first 10 bytes (bytes 2 to 11) will recieve the time
stamps of the first directory entry of the current block,
the second 10
bytes (bytes 12 to 21-) the time stamps of the second entry, and the last
10-byte
group (bytes 22 to 31) the ones of the third
directory
entry.
The very last byte (32) of the "Time - FCB" is reserved.
Such a 10-byte time stamp bears the following information:
Bytes 1-4
Moment of creation or last access
Bytes 5-8
Moment of last alteration
Byte 9
Password mode, always 0 under EOS.
Byte 10
- reserved -
It
should
be mentioned that EOS refuses to create directory labels
if
the
data byte requests time stamps,
but no
11
Time - FCBs
11
are
present
within the directory.
EOS System manual
Daeumling
&
Zimmermann
Page 10
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