(
Header Records
Header records are located on the data track. They are
the first record
in
a file preceding the data records. The
following illustration shows the contents and format
of
a
header record.
~
t
Last
Data
Record in
Previous
File
Format
Record
I
I
/
/
/
I
/
/
/
/
I
I
I
Format
Record
\
..
I.J
t
Header
Record
I
File Number / Number
of
Bytes Allocated
to
File
Hex
0001-7FFF
--t-----,
.-
Hex
0OO1-3FFF
rmll
Language
Dependent Information
1
File Type:
00
Marked/Unused File
01
Data File
02 General File
03
BASIC Source File
Header
Record
04
BASIC Workspace File
05
BASIC Keys File
06
APL Continued File
07
APL Save File
08
APL Internal Format Data File
09-15
Reserved
16
Patch
17
Diagnostic
18
Communications Adapter/Serial
I/O
Adapter
Load
File
72 Read/Write Storage
to
Tape Dump
FF
(hex)
End
of
Marked Tape
Note: The preceding decimal numbers
for
the file type
are used by UTIL or
LIB
commands.
DCP1
uses the hex
equivalents.
Format
Record
I
t
Data Record
No.2
If
J
Tape 4-35
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