HP 13255 Technical Information page 40

tl2~5
Cartridge Tape Module
13255-91032/38
Rev AUG-Ol-7b
3.4.1
3.4.2
HOLE STATUS FORMAT. The positioning of holes in the cartridge tape
and the duration Of the signal from the hole detect circuitry on the
Cartridge Electronics PCA is shown in figure
14.
INTERCHANGE STANDARDS. The code, format of the encoded data, and the
region
Of
valid recording area on the
3M 9585
mini cartridge should be
as follows in order to facilitate product interchange.
VALID RECORDING
AREA
The portion of the tape where data may be recorded
is shown in figure
15.
FILES
BYTES
RECORDS
RECORD
ORGANIZATION:
Preamble
Header
Body
Checksum
Postamble
INTEH-RECORD GAPS:
Length
POlarity
FILE
MARKS
END
Of
VALID DATA MARK
There may be
1 to 344
files per cartridge.
Recording is bit serial, eight bits to a byte, LSB to
MSB.
Records are variable 1n length and may contain from
12
to
267
bytes. There may be
444
to
517
records of
ot maximum length per cartridge.
(3)
bytes octal zero followed by
(1)
byte octal
200
(2)
bytes to define binary length
Of
record (roost
significant byte first).
1
to
256
data bytes.
1
byte binary addition modulo 256.
The postamble is
(1)
byte octal
1
followed by (3)
bytes octal zero.
0.805"
min.,
0.905"
max.,
0.88
nominal.
The IRG shall magnetize so that the beginning of the
tape is a north seeking pole. NOTE: There are
0.01712
+1-0.0003"
of tape travel for each detected edge.
Files shall be separated by a unique length gap and
record as follows:
1.61"
min.,
1.81"
max. gap
followed by a
1.61"
min.,
1.81"
max. gap.
NOTE: The fIle mark. record header is unique insofar
as the most significant byte is always a
·1".
A file mark followed
by
a gap of
11
+I-O.S"