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Commodore 1581 - Page 131

Commodore 1581
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SEQUENTIAL
FILE
FORMAT
BYTE
DEFINITION
ALL
BUT
FINAL
SECTOR
0-1
Track
and
sector
of
next
sequential
data
block.
2-255
254
bytes
of
data.
FINAL
SECTOR
0,1
Null
($00),
followed
by
number
of
valid
data
bytes
in
sector.
2-???
Last
bytes
of
data.
Any
remaining
bytes
are
garbage
and
may
be
ignored.
RELATIVE
FILE
FORMAT
BYTE
DEFINITION
DATA
BLOCK
0,1
2-255
Track
and
sector
of
next
data
block.
254
bytes
of
data.
Empty
records
contain
$FF
(all
binary
ones)
in
the
first
byte
followed
by
$00
(binary
all
zeros)
to
the
end
of
the
record.
Partially
filled
records
are
padded
with
nulls
($00).
SIDE
SECTOR
BLOCK
0-1
2
3
4-5
6-7
8-9
10-11
12-13
14-15
16-255
Track
and
sector
of
next
side
sector
block
in
this
group
Side
sector
number
(0-5)
Record
length
Track
and
sector
of
first
side
sector
(number
0)
Track
and
sector
of
second
side
sector
(number
1)
Track
and
sector
of
third
side
sector
(number
2)
Track
and
sector
of
fourth
side
sector
(number
3)
Track
and
sector
of
fifth
side
sector
(number
4)
Track
and
sector
of
sixth
side
sector
(number
5)
Track
and
sector
pointers
to
120
data
blocks.
SUPER
SIDE
SECTOR
BLOCK
0-1
2
3-4
5-6
253-254
Track
and
sector
of
first
side
sector
in
group
0
$FE
Track
and
sector
of
first
side
sector
in
group
0
Track
and
sector
of
first
side
sector
in
group
1
Track
and
sector
of
first
side
sector
in
group
125
The
super
side sector
has
pointers
to
126
groups
of
side
sectors.
Each
of
these
groups
contains
6
side
sectors.
Each
side
sector
points
to
120
data
blocks,
containing
254
bytes
each.
126
x
6
x
120
x
254
=
23,042,880
bytes
(maximum
relative
file
size)
122

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