Tandy 1000 Programmer's Reference Manual page 169

Chapter 4 I MS-DOS Disk Allocation
02H Hidden file. The file is excluded from nor-
mal directory searches.
System file, The file is excluded from nor-
mal directory searches.
The entry contains the volume label in the
first 11 bytes. The entry contains no other
usable information (except date and time of
creation) and may exist only in the root
directory.
10H The entry defines a sub-directory, and is
excluded from normal directory searches.
20H
Archive bit. The bit is set to 1 whenever the
file has been written to and closed.
Note: The system files (I0.SYS and MSDOS.SYS)
are marked as read only, hidden, and system files.
Files can be marked hidden when they are created.
Also, the read only, hidden, system, and archive at-
tributes may be changed through the Change Attri-
butes function call (43H).
04H
08H
OCH-15H Reserved.
16H-17H Time the file was created or last updated. The
hour. minutes. and seconds are mapped into two
ytes as followS:
Offset 17H
Offset 16H
M M M
7 1 6
1 5
H
M M M
4
1 :
1 2
I 1 I 0
I
where:
HHHHH
MMMMMM
59)
SSSSS
increments
is the binary number of hours (0-23)
is the binary number of minutes (0-
i s t h e b i n a r y number of two-second
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