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SYSTEM DESCRIPTION
24. 1 -- Diskette
St~ucture
Su~~ix
Implied meaning
AL
Assembly listing file
CF
Chain
p~ocedu~al
file
eM
Command file file
ED
EDOS-converted file
LO
Loadable, memory-image file
LX
EXbug-loadable
~ile
RO
Relocatable obJect file
SA
ASCII source file
SY
Internally-used system file
Logical unit numbers identify the
drive
that
contains
the
file.
Since
each
diskette
ca~~ies
with
it its
o~n
directorYI
different files with identical names
and
suffixes
can
reside
on different diskettes.
The
standard format ror specirying rile names}
suffixes
and logical unit numbers is:
<file-namej.<suffix>:<logical unit number)
UJ
h
e
~
e
the
per i
0
d (.) and colon (:) s e r vet
0
del
i
mit the s ta r t
of
the
suffix
and
the
logical
unit
numbe~
fields,
resp ec
t i
ve
1 y.
In addition to
a
name}
each directory entry
contains
a
set
of
att~ibutes
which characterize the file's content.
A
file's attributes include inherent attributes and
aSSignable
att~ibutes.
The
inherent attributes of
a
file describe its
allocation scheme (contiguous
o~
segmented),
the
file
format
(ASCII record,
binary record, memory-image,
or
use~-defined)'
and whether space compression is used for ASCII records.
The
file
fo~mats
are described in section
24.3.
The
assignable
attributes
include
write
p~otectionl
delete protection,
and the
s~stem
file attribute.
If a
file
i
s
UI~
i
t e pro tee ted l i t can not b e
\IJ~
itt en in too r
del
e
ted.
I f
a
file
is
delete protected,
it cannot
be
deleted.
If a
file
has
the
system
attri~ute,
it will be included in the
s~stem
generation process (DOSGEN) and is handled differently by the
DEL
and
DIR
commands.
The_ format
or
a
directory
ent~y
is described in the
following table:
Page
24-05
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