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Commodore 1581 - Page 130

Commodore 1581
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•STRUCTURE
OF
EACH
INDIVIDUAL
DIRECTORY
ENTRY
BYTE
OFFSET
0
1-2
3-18
19-20
21
22-25
26-27
28-29
CONTENTS
128
+
type
DEFINITION
File
type
OR'ed
with
$80
to
indicate
properly
closed
file.
(if
OR'ed
with
$C0
instead,
file
is
locked.)
TYPES:
0
=
DELeted
1
=
SEQuential
2
=
PROGram
3
=
USER
4
=
RELative
5
=
CBM
Track
and
sector
of
first
data
block.
File
name
padded
with
shifted
spaces.
Relative
file
only:
track
and
sector
of
the
super
side
sector
block.
Relative
file
only:
record
length.
Unused.
Track
and
sector
of
replacement
file
during
an
©SAVE
or
©OPEN.
Number
of blocks
in
file:
stored
as
a
two-byte
integer,
in
low-byte,
high-byte
order.
PROGRAM
FILE
FORMAT
BYTE
DEFINITION
FIRST
SECTOR
0,1
Track
and
sector
of
next
block
in
program
file
1.
2,3
Load
address
of the
program.
4-255
Next
252
bytes
of
program
information
stored
as
in
computer,
memory
(with
key
words
tokenized).
REMAINING
FULL
SECTORS
0,1
Track
and
sector
of
next
block
in
program
file
1.
2-255
Next
254
bytes
of
program
information
stored
as
in
computer
memory
(with
key
words
tokenized).
FINAL
SECTOR
0,1
Null
($00),
followed
by
number
of
valid
data
bytes
in
sector.
2-???
Last
bytes
of
the
program
information,
stored
as
in
computer
memory
(with
key
words
tokenized).
The
end
of
a
BASIC
file
is
marked
by
three
zero
bytes
in
a
row.
Any
remaining
bytes
in
the
sector
are
garbajge
and
may
be
ignored.
121

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