HP 13255 Manual

HP 13255
CARTRIOG~ TAPE MODULE
Manual Part No. 13255-91032
PRINTED
AUG-Ol-76
DATA TERMINAL
1~ECHNICAL INFORMATION
_._._----------------------
HEWLETT~PACKARD
Printed in U.S.A.

13255
Cartridge Tape Module
1.0 IMTRODUCTION.
13255-91032/02
Rev AUG-Ol-76
The cartridge Tape Module consists of a Cartridge Tape Unit (CTU)
Interface peA, a Read/Write PCA, a CIU Top Plane Assembly, two CTU
Transport Assemblies, and one or more mini tape cartridges. Each tape
cartridqe contains 150 teet ~f single-track O.150-inch tape with a
maximum tOrmatted storage capacity ot 110K eight-bit data bytes. The
dual cartridge tape units provide full read and write capabilities for
phase-encoded data. Data, command, status information, and address
interfacing between this subsection and other terminal modules is pro-
vided by the Backplane Assembly and CTU Interface PCA. The R~ad/Write
PCA controls recording, reading, and tape motion Of the two CTU Trans-
port Assemblies. Interfacing between the two PCA's is provided by the
CTU TOp Plane Assembly and interfacing between the Read/write PCA and
the two CTU Transport Assemblies is provided by a Motor cable Assembly
and two CTU ribbon cable assemblies.
2.0 OPERATING PARAMETERS.
A summary of operating parameters for the Cartridge Tape Module Is
contained in tables 1.0 through 5.3.
Table 1.0 Physical Parameters
----------------~---~---~----~--~---~-----~-~-~-~-~-~~--~---------~--~~--~~---~~
-----~~---------~-----~-----~-----------~-~~~----------------~---------~~-----~-
part
Size
(L
x W x D)
Weight
Number
Nomenclature
+/-0.100 Inches
(Pounds)
-.-.--.-----... _--
-~-------~-------~----------~~
=======================
=========
----_ ... _---_ .... --
---~------~-------~---~~------
O~640-60021 CTU
Top Planp.
Assembly
4.4
x
1.1
x
0.7 0.10
02640-60032
Read/write
PCA
12.5
x
4.0
x
0.6 0.60
02640-60033
CTU
Interface PCA
12.5
x 4.0 x
0.5
0.40
02640-60034
Cartridge
Flectronics PCA
3.8 x
2.0
x
1.3
0.10
02640-60050
CTU
Transport
Assembly
5.1 x
3.6 x 3.8
0.80
02640-60054
Cl'U Base
Assembly
N/A
N/A
02640-60055 Motor/Tachometer
Assembly
tv/A N/A
02640-60056 Head
Bridge
Assembly
t-t/A
N/A
02640-60057
Tachometer
Coil AssemblY
N/A N/A
02640-60066
CTU Cable Assembly
N/A
N/A
02640-60067 Head
Assembly
N/A
N/A
02640-60074
Magnet
Assembly
N/A N/A
02640-60076 Disc/Capstan Assembly N/A
N/A
0~640-60085
Motor Cable Assembly N/A
N/A
02640-60102
Cl'U Bezel Assembly N/A
N/A
9162-0061
Mini cartr1dge
N/A N/A
==============================================================================
Number of Backplane Slots Required: 2
================================:===============================================

HP 13255
CARTRIDGE TAPE MODULE
Manual Part No. 13255-91032
PRINTED
AUG-Ol-76
____ . ...-_ .... _.-~ .......... -----------~-.a-------....~~---.-~----------...-.----
NOTICE
The information contained in this document is subject to change
Without notice.
H~WLETT-PACKARO MAKES NO WARRANTY OF ANY KIND WITH REGARD TO THIS
MATERIAL, INCLUDING, BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FIT~ESS FOR A PARTICULAR PURPOS~. Hewlett-Packard
shall not be liable for errors contained herein or for incidental or
Consequential damaqes in connection with the turnishing, performance,
or use of tnis material.
Tnis document contains proprietary information which is protected by
copyright. All rights are reserved. ~o part of this document may be
Photocopied or reproduced without the-orior written consent ot He~lett
Pa.ckard Company.
-~-- .. --~~------~~--~-~------.~--.~-~--~---~-------~~-~-----------~---------~----
Copyright c 1976 by HE~L~TT-PACKARD COMPANY
NOTE: This document Is part of the 264XX DATA -TERMINAL product
series Technical Information Package (HP 13255).

132~5
Cartridge Tape Module
1.0 IMTRODUCTION.
13255-91032/02
Rev AUG-01-76
The cartridge Tape Module consists of a Cartridge Tape Unit (CTU)
Interface peA, a Read/Write PCA, a CiU Top Plane Assembly, two CTU
Transport Assemblies, and one or more mini tape cartridges. Each tape
cartridqe contains 150 teet of Single-tracK O.150-inch tape with a
maximum tormatted storage capacity ot 110K eight-bit data bytes. The
dual cartridge tape units provide full read and write capabilities for
phase-encoded data. Data, command, status information, and address
interfacing between this subsection and other terminal modules is pro-
vided by the Backplane Assembly and CTU Interface PCA. The Read/Write
PCA controls recording, reading, and tape motion Of the two CTU Trans-
port Assemblies. Interfacing between the two PCA's is provided by the
CTU TOp Plane Assembly and interfacing between the Read/Write PCA and
the two CTU Transport Assemblies is provided by a Motor Cable Assembly
and two CTU ribbon cable assemblies.
2.0 OPERATING PARAMETERS.
A summary of operating parameters for the Cartridge Tape Module Is
contained in tables 1.0 through 5.3.
Table 1.0 Physical Parameters
================================================================================
part
Number
=============
0:l640-60021
02640-60032
02640-60033
02640-60034
02640-60050
02640-60054
02640-60055
02640-60056
02640-60057
02640-60066
02640-60067
026,*0-60074
02640-60076
0:l640-60085
02640-60102
9162-0061
Nomenclature
-~------------~~-~--~~---~--~~
-~~~--------------~---------~-
CTU Top Plan~ Assembly
Read/Write peA
CTU Interface PCA
Cartridge Flectronics peA
CTU Transport Assembly
CTU Base As~embly
Motor/Tachometer Assembly
Head Br1dge Assembly
TaChometer Coil Assembly
CTU Cable Assembly
Head Assembly
Magnet Assembly
Disc/Capstan Assembly
Motor Cable Assembly
CTU Bezel Assembly
Mini cartridge
Size (L x W x D)
+/-0.100 Inches
=======================
4.4 x 1.1 x 0.7
12.5 x 4.0 x 0.6
12.5 x 4.0 x 0.5
3.8 x 2.0 x 1.3
5.1 x 3.6 x 3.8
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Weight
(Pounds)
=========
0.10
0.60
0.40
0.10
0.80
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
==============================================================================
Number of Backplane Slots Required: 2
================================================================================

13255 13255-91032/03
Cartrldge Tape Module Fev AUG-Ol-76
Table 2.0 Peliabil1ty and Environmental Information
=====::==========================================================================
I:.nvlronmentaJ.:
( X ) HP CldSS B ( )
Other:
Restrictions: Type tested at product level except the cartridge
tape. The cartridge tape limits temperature and
humidity conditions as follows.
Free
space ambient
temperature:
Non-operating:
-10 to + 65
degrees
C
(-15 to
+150
degrees F)
Operating: + 5 to
+
40
degrees
C
(+41
to
+104
degrees
F')
Humidity: 20 to 80% (non-condensing)
====::=========================================================================
Failure Rate (percent per 1000 hours) of Major Assemblies:
CTU Interface PCA
Read/Write peA
CTU Top Plane Assembly
Motor Cable Assembly
CTU Transport Assembly
0.82340%
4.04199%
0.000R8%
0.00060%
4.17800%
Lite expectancy tor components of the CTU Transport Assembly (the maximum
insertion rate =1 per second. Data for the head, motor, and motor
capstan apply to start-stop motion at 10 inches per second):
E.ject, Insert Mechanism 20,000
insertions min. (50,000
typical)
cartridge Insert and
100,000
insertions
min.
file Protect Switches
Head/Write
Head
3,000
hours min.
(10,000
hours
typical)
14otor 1,000
hours
min.
(
5,000
hours
typical)
I~Otor Capstan
1,000
hours min.
(
5,000
hours
typical)
=====::==========================================================================

13255
Cartridge Tape Module
13255-91032/04
Rev AUG-Ol-76
laole 3.0 Total Module power Supply and Clock Requirements - Measured
While Accelerating to 60 ips (At +/-5% Unless otherwise Specified)
================================================================================
+5 VOlt supply +12 Volt supply
~ 1350 rnA
@ 1630 rnA
-12 Volt Supply
@ 1580 rnA
+42 Volt SupplY
rnA
NOT APPLICABLE
======================================1=======================================
115 volts ac 220 volts ac
A A
NOT APPLICABLE NOT APPLICABLE
==============================================================================
Clock Frequency:
4.915 MHz
================================================================================

132~S
Cartridge Tape MOdule
13255-91032/05
Rev AUG-Ol-76
Table 4.0 Connector Information for CTU Interface PCA
================================================================================
connector
and Pin NO.
===:===========
PI, Pin 1
..2
-3
-4
-5
-6
-7
-8
··10
-11
-12
-13
-14
-15
-16
-11
-18
-19
-20
-21
-22
Signal
Name
-~--~-~---------
-~----~-------~-
+5V
GND
SYS eLK
-l2V
ADORO
ADORI
ADOR2
ADOR3
ADDR4
ADDR5
ADDP6
ADDR7
ADORa
AODR9
ADDRI0
ADORl1
ADOH12
ADDR13
ADOH14
ADDR15
I/O
GND
Signal
Description
-----~-------~~---------------~~----~------~--
-~~~-----~-~--~---~-~--~----------------------
+5 Volt Power Supply
Ground Common Return (Power and Signal)
4.915 MHz System Clock
-12 Volt Power Supply
Negative True, Address Ait 0
Negative True, Address Bit 1
Negative True, Address Bit 2
Negative True, Address Bit 3
Negative True, Address Bit 4
Negative True, Address Bit 5
Negative True, Address Bit 6
Negative True, Address Bit 7
Negative True, Address Bit 8
Negntive True, Address Bit 9
Negative True, Address 8it 10
Negative True, Address Bit 11
Negative True, Address Bit 12
Negative True, Address Bit 13
Negativ~ True, Address 81t 14
Negative True, Address Bit 15
Negative True, Input Output/Memory
Ground Common Return (Power dnd Signal)
================================-===============================================

13255
Cartridge Tape Module
13255-91032/06
Rev AUG-Ol-16
Table 4.0 Connector Intormation for CTU Interface PCA (Cont'd.)
=====:==========================================================================
Connector Signal
and Pin NO. I Name
==============1================
PI, Pin A I GNO
I
-Ii I POLL
I
I
-c I +12V
t
-I)
PWR ON
-E
BUSO
-F
RUS1
-H
BUS2
-J
BUS3
-K
BUS4
-L
BUS5
-~
RUS6
-N BUS.,
---
-P
wRITE
-R
ATN2
-s WAIT
-T
PRIOR IN
-u PRIOR
OUT
-_ ...... .....-.-------
-V
PROC
ACTIVE
-w
BUSY
-x
RUN
-y
REQ
-z
ATN
Siqnal
Description
----------------------------------------------
~------~-------------~--~-~----~--~-~----~--~-
Ground Common Return (PGwer and Signal)
Negative frue, Polled Interrupt
Identitication Request
+12
Volt Power
Supply
System Power
On
Negative
True, Data
Bus
Bit
0
Negative
True, Data Bus Bit
1
Neqative
True, Data
Bus
Bit
2
Negative
True,
Data Bus
Bit 3
Negative
True, Data
Bus Bit 4
Negative
True, Data Bus Bit 5
Neqative
True, Data Bus Bit 6
Negative
True,
Data
Bus
Bit
1
Negative
'frue,
write/Read Type
Cycle
Negative True, CTU and
Polled
Interrupt
Request
Negative
True, wait Control Line
Bus Controller
Priority
In
Bus
Controller Priority
Out
Negative
True,
Processor Active
(Controlling Bus)
Negative
True, Bus
Currently
Busy
(Not
Available)
Allow Processor to Access Bus
Negative True, Request (Bus Data
Currently Valid)
Negative True, Data Comm Interrupt Request
================================================================================

13255
Cartrldge Tape ~odule
13255-91032/07
Rev AUG-01-76
Table 4.1
connector Information for CTU Interface PCA
================================================================================
Connector Signal
I and Pin NO. I Name I
==============1================
P3, Pin 1 I
tnru -22 I
---------~---~I------~---------
p3,
Pin
A
LO
-8
HOLO
-C
Ll
-0
HOLI
-E
+SV
-F kE
-H
USO
-J
DATA
-K
2Xl'ACH
-L
RUNG
-M
TACH
-N DZX
-p
GAP
-R
CINO
-S
ClNl
-T
RIP
-u DZX
-v STOP
-w
FF'U
-x
SFt>
-y
FREV
-z SREV
Signal
Description
-~--~~~~-~--~--~--~~-----~--------~-~---------
----~-----~--~-------~---~--~--~-~--~--~--~---
} Not
} Used
--------~-----.-----~-----------~-------------
Negative
True,
Lamp
Unit
0
Negative
True, Hole Unit 0
Detected
Negative True,
Lamp
Unit
I
Negative
True,
Hole Unit
1
Detected
+5V Supply
-~-.----
Negative True, Record Enable
(Read E~nable)
Unit Select 0
(select
left
unit)
Negative True, ~rite Data (high writes
flux in north seeking pole direction)
Two Times Tachometer Frequency
Running (>1 ips forward or reverse)
Tachometer frequency
Data Zero Crossing (testing purposes onlY)
Gap Detector
Cartridge Inserted in Unit 0
Cartridge Inserted in Unit 1
Record In Progress
Negative True, Data Zero Crossing
Obsolete (tied to +5V thru 4.7 kilohms)
Negative True, Fast Forward
Negative True, Slow Forward
Negative True, fast Reverse
Negative True, Slow Reverse
-~--~-------~-- ------~---~-------------------~-----~------------------------~-
~~------------~-~----~-----~~---------~------~-----~-~~~-~------~-~-------------

132~5
Cartridge Tape Module
13255-91032/08
Fev AUG-Ol-16
Table 4.2
Connector Intormation for Read/Write peA
===============================:================================================
conn~ctor
ana Pin NO. I
==============
J4
{,
J5
1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-11
-12
-13
-14
Signal
Name
--~-~---~-~-----
-~~----~--------
TCOM
HEAD-
HEAD GNU
CI
HOLE
+5V
+SV RET
L
HEADCT
HEAD+
TGND
T
Signal
Description
---~--------------~~--~~-~----------~-~--~---~
~------------~-~------~--~---------~~~~~-~~--~
Tacnometer coil (common), D.C. Level +2.5V
Not Used
Head
(-) AC Signal, Data Dependent
Head Ground
Neqatlve True, Cartridge Inserted
Negative True, Hole
+5V Supply
+5V Return
Negative True, Lamp
Head Center Tap, AC Signal, Data
Dependent, Active on Write Only
Head (+) AC Signal, Oata Dependent
Tachometer Ground
Not Used
Tachometer Coil, AC Signal, Frequency
Depends on Motor Speed
-------------- ---------------- ----------------------------------------------
J6
-1
Motor 0 (-)
-2
+
Motor 0 (+)
-3
Motor 1 ( .. )
-4
+
Motor 1 (+)
================================================================================

13255
Cartridge Tape MOdule
13255-91032/09
Rev AUG-01-76
Table 4.3
Connector Information for Read/Write PCA
=====::==========================================================================
c(>nnector
and Pin NO.
====::=========
PI., Pin 1
-2
-3
Signal
Name
--------~---~---
----------------
+5V
GND
Signal
Description
~------------~~~-----~-~-------~-~~-~--------~
--------------------------~-~-~-~-------------
+5 Volt Power Supply
Ground Common Return (Power and Signal)
Not Used
-4
-12V -12 Volt Power Supply
Pin -5
tl"lrOugh
Pin -22
}
} Not Used
}
-~-~ .. --~-----~ -~-------------- ----------------~-----~-----------------------
~11' Pin A
ttl rough
Pin -B
-c
Pin -()
tJ1rol]gh
Pin -s
-1
-u
Pin -v
tJ1rough
Pin -z
}
}
}
+12V
}
}
}
PRIOR IN
PRIOR OUT
}
}
}
Not Used
+12 Volt Power SupplY
Not Used
Bus
Controller
Priority
In
Bus
Controller Priority Out
Not Used
=====~:====:==================:======================= ===========================
Table 4.4 Connector Information for Read/Write PCA
=====:================================================:===:=================::===
cunnector Signal
ane] Pin NO. I Name
====~=========t================
P3, Pin 1 I
ti1rough f
Pin ... 6 I
I
-1 I GND
t
Pin -R t
tllrouQh I
Pin -22 I
Signal
Description
-~-~-~-~~--------~~----~-----~-~----~~----~--~
~------~----------------~--~~--~-~----------~~
}
} Not Used
}
Ground
}
} Not Used
}
=====;::=:================:===================;==================================

132~5
Cartrldge Tape MOdule
13255-91032/10
Rev AUG-01-76
Table 4.4 connector Information for Read/write peA (Cont'd.)
================================================================================
connector Signal Signal
ana Pjn No. t Name I Description I
============== ================1==============================================
I
P3, ptn A LO 'Neqative True, Lamp Unit 0
t
-8 HOl,O I Neqatl ve True, Hole Uni t 0 Detected
,
-c
1.11
-D
HOLI
-E
+SV
-r RE
-H
USO
-J
DATA
-K
2XTACH
-L
RUNG
-M
TACH
-N DZX
-p
GAP
-R
CINO
-5 CINI
-T
HIP
-U
DZX
-V
STOP
-w
FFO
-X
SFO
-y
FREV
-Z
SRF.V
Negative True, Lamp Unit 1
Negative True, Hole Unit 1 oetect~d
+5V Supply
Negative True, Record Enable (Read Enable)
Unit select 0 (select left unit)
Negative True, Write Data (nigh writes
flux in north seeking pOle direction)
Two Times Tachometer Frequency
Running (>1 ips forward or reverse)
TaChometer Frequency
Data zero Crossing (testing purposes only)
Gap Detector
Cartridge
Inserted
in Unit
0
Cartridge Inserted
in Unit
1
Pecord
In
Progress
Negative True,
Data
Zero Crossing
Obsolete (tIed
to +5V thru 4.7
kilohms)
Negative
True,
f'ast
Forward
Negative
True, Slow Forward
Negative
True, Fast Reverse
Negative
True,
Slow Reverse
================================================================================

132~5
Cartridge Tape Module
13255-91032/11
Fev AUG-Ol-76
Table 4.5 Connector Information for Cartridge Electronics peA
================================================================================
connector
and Pin ~O.
==============
Jt
1
Signal
Name
--~~~~~--~~-~-~
... -~ ... -------------
T
Signal
Descriptlon
:=============================================
Tachometer ColI, AC S1gnal, Frequency
Depends on Motor Speed
-2 TGNO Tachometer Ground
-3 TeOM Tachometer Coil (Common), DC Level +2.5V
---------~---- -----------_ .. -- ----~~-----.-------.---'--~------------~---~--~
J2
-1
TCOM
-2
-3 HEAD-
-4
HEAD GNU
-5
CI
-6
HULE
-7
+5V
-8
+SV RET
-9
L
-to HEADCT
-11 HEAD+
-12 TGND
-13
-14
Tachometer Coil (Common), DC Level +2.5V
Not Used
Head (-) AC Slgnal, Data Dependent
Head Ground
Neqative True, Cartridge Inserted
Negative True, Hole
+5V Supply
+5V Return
Negative True, Lamp
Head Center Tap, AC Signal, Data
Dependent, Actlve on Write nnly
Head (+) AC Signal, Data Dependent
Tachom~ter Ground
Not Used
Tachometer Coil, AC Siqnal, Frequency
Depends on Motor Speed
============:====================================================================

tJ2~5 13255-91032/t2
CartrIdge Tape Module Rev AUG-Ol-76
Table 5.0 Module Bus Pin Assignments
============================:===================================================
Function
Bus
Performed: Read Data From CTU
Valu~
Signal
_ ... _ ...... - ... ----------------
- ...... ....,~---
------------
X
ADDR 15
Poll Bit: Bit 7 X
AD DR
14
X
ADDR
13
~odule Address: (ADOR 11,10,9,4) = (1011)
X
ADDR
12
1
ADOR
11
0
AD OR
10
1
ADOR 9
~unction Specifier: ADDR5 = 1 X AllOR
R
X AD DR 7
X
ADDR
6
Data Bus Bit Interpretation:
1
ADDR 5
1
ADOR 4
X
ADOR
3
B7 Data Bit 7 X
ADOR 2
(Most significant bit of data)
X .ADOR
1
X
AODR
0
...... _----
... --_ .. -- ....._... - ....
--_ ........-
----.-.- ..... ~ ... .- .....
Ab Data Bit 6
87
BUS 7
86
BUS
6
85
BUS 5
8~ Data Ait 5
84
BUS
4
83
RUS
3
82
BUS
2
64 Data Bit 4
1:)1
BUS 1
BO BUS
0
-------~~~-~---~----
~- ... ~-~---~-~---~--~-
BJ Data Bit 3
I=Logical
l=BUS
Low
O=Logical O=Bus
High
IX=Don't
Care
-------~---------~---
----~-------~--------
82 Data Bit 2
B1 Data Bit 1
80 Data Bit 0
lLeast significant bit Of data)
================================================================================

13255
Cartridge Tape Module
13255-91032/13
Rev AUG-OI-16
Table 5.1
Module Bus Pin Assignments
=====:===========================================================================
Function
BuS
Performed: Write Data To CTU
Value Signal
- .. ~ .. - .. -...
_---_ .. -... ----
_ ...... _---
-~ .. ------ ...----
X ADDR
15
pl:>ll Bit:: Bit 7 X
AOOR
14
X
.anOR
13
MQdUle Address:
(ADDR 11,10,9,4) = (1011)
X
ADDR
12
1 ADDR
11
0
ADDR
10
1
ADOR 9
Function Specifier: AOORS
= 1 X
ADDR
8
X
AD DR
1
X ADOR 6
Ol3ta Bus
bit
Interpretation:
1
AD DR 5
1
ADOR 4
X
ADDR
3
B7 Data Bit
1 X
ADOR
2
(Most
significant
bit
of
data)
X
ADDR 1
X ADDR
0
-~- .. ---
____ ... __ .. _-.r __
-------
-------------
BIt)
Data
8it
6
87 BUS 1
86
BUS 6
B5 BUS 5
B!)
Data
Bit 5
B4
BUS 4
83
BUS
3
62
BUS
2
84
Data
Bit 4 bl
BUS
1
80 BUS 0
---~-------------~--
-~~~-~~----~--------
B.3 Data
Bit
3
l=Loqical
l=Bns
LOW
t
O=Logical
O=Bus
High
X=Don't
Care
--~-~----------------
-~-~----~--~---~-----
B,l
Data
Bit
2
8.L
Data
Bit
1
f3e)
Data
Bit
0
<'l,east
significant bit of
<lata)
~----.-----------~-----------~-------~---------------------~-~------------------
~--~-.----~------~-~-----~~-~~~~~-~--~-~~--~-~--~-~-~-~-~-~-~~--~---~-~--~~------

13255 13255-91032/14
Cartridge Tape ~Odlll~ Rev AUG-Ol-76
Table 5.2 Module Bus Pin Assignments
================================================================================
Function
Performed: Input Status From eTU
Poll Bit: Bit 7
Module Address: (AODR 11,10,9,4) = (1011)
Function Specifipr: ADDR5 = 0
Data Bus 8it Interpretation:
B7 -Not APplicable
80 - BYTE ROY 1s set to "1" in Read mode when the
preamble is detected or a byte Is ready to be
read from the eTU Module or can be accepted for
recording. BYTE RDY is set in Record mode when
a
byte has been encoded.
B!:> -GAP is the output of toe qap detector on the
Read/Write PCA.
84 - HOLE is set to "1" whenever a hole is detected
on the tape and is cleared when status is read.
B3 - TAK is the frequency ot the tachometer divided
by 2. There are 58.4 transitlorts of the TA~
status per inch of tape movement.
Bus I
Value Signal I
======= ============1
X AODR 15 I
X ADDH 14 I
X ADDF 13 ,
X ADDR 12 I
1 ADDR 11 I
o ADDR 10 I
1 ADDR 9 ,
X ADDF 8 I
X ADDR 7
X ADDR 6
o ADDR 5
1 ADDR 4
X ADDR 3
X ADDR 2
X AODR 1
X ADOR 0
----~-- -~----~~~~~-
-~----- -~~---~-~---
87 BUS 7
86 BUS 6
tl5 BUS 5
84 FHJS 4
83 BUS 3
82 BUS 2
Bl BUS 1
BO BUS 0
====================
l=Logical l=Bus LOW
O=Logical O=Bus High
X=Don't Care
--~~~-~~~---~-~~~~~~~
--~---~~--~~~-~~~-~~~
Bi -RIP indicates the presence of head current while recording a gap.
The state of this signal Is not defined during read operations or
while data Is being recorded.
o = No write current (tape protected)
1 = Write current present while in gap
B1 - eIR indicates that a cartridge is inserted in the right CTU
Transport Assembly and is cleared when the cartridge is removed.
o = No cartridge in rioht eTU Transport Assembly
1 = Cartridge inserted in rignt CIU Transport Assembly
80 - elL indlc~tes that a cartridge is inserted in the left eTU
Transport Assembly and is cleared when the cartridge is removed.
o = No cartridge in left CTU Transport Assembly
1 = Cartridge inserted 1n left CTU Transport Assembly
================================================================================

13255
CartrIdge Tape MOdule
Table 5.3
Module Bus Pin Assignments
13255-91032/15
Rev AUG-01-76
=====::===================================:======================================
Function
P~er tormed: Output Command to rTU
Module Address: (ADDR 11,10,9,4) = (1011)
Function Specifier: ADDR5 =0
Data Bus Bit Interpretation:
81 - ANL
o = Turns off left eject button light
1 = Turns on left eject button liqht
Bb - ANR
o = Turns off the right eject button light
1 = Turns on the right eject button light
B~ - GEN
o = Disables gap recording
1 = Record gap on tape (Bit 3 must also be !)
84 - USL
o = Houte command to right drive
1 = Route command to left drive
BJ -REC
o = Read mode
1 = Record mode (enable write circuit)
Bi - FST
o = Run tape at slow speed (10 ips)
1 = Run tape at high speed (60 ips)
81 - FWD
o = Forward
1 = Reverse
au - RUN
o = stop tape
1 = Move tape according to FST and FWD
Bus
Value Signal
_ .... - .. ---
- .. -.... _- ... -----
-- .... -.-.--
---- ... -------
X
ADDR
15
X
ADDR 14
X
AODR
13
X
ADDR 12
1
AUOR
11
0
ADDR
10
1
ADDR 9
X ADDR 8
X ADDR 7
X
ADOR
6
0
ADOR 5
1
AVDR
4
X
ADOR
3
X
AODR 2
X
ADOR
1
X ADDR
0
-- .. ~-.--
--_ .. -._---- ..... -
... --_ ..... --
.---_ .... _--------
87 BUS
7
b6
BUS 6
85
BUS 5
B4
BUS
4
B3
BUS
3
B2
BUS
2
Bl
8US
1
60
BUS
0
===================:
l=Loqical l=Bus
LOw
O=Logical O=Bus
High
X=Oon't Care
=====================
=====:===========================================================================

13255
Cartridge Tape Module
13255-91032/16
Rev AUG-01-76
3.0 FUNCTIONAL DESCRIPTION - CTU INTERFACE PCA. Refer to the block diagram
(figure 1), sChematic diagram (figure 2), component location diagram
(figure 3), and parts lists (02640-60021 and 02640-60033) located in
the appendix.
The terminal processor communicates with the Cartridge Tape MOdule via
the terminal bus (Backplane Assembly). The CTU Interface PCA is re-
sponsible for converting processor commands into signals to control
tape motion, unit selection, read or write operation, and the state of
the eject button lights. The CTU Interface peA provides status infor-
mation allowing the processor to determine the present state of the
selected CTU Transport Assembly. Finally, the CIU Interface PCA en-
codes data bytes into serial patterns of bit transitions to be recorded
on the tape and vice versa (i.e., decodes bit transitions on the tape
into data bytes).
3.0.1 BUS FUNCTION DECODE? AND TIMING LOGIC - CTU IN1~RFACE PCA.
3.0.1.1 The bus tunction decoder and timing logic generates signals based upon
inputs from the terminal bUS which control the flow of commands, sta-
tus, and data bytes to and from the terminal bus.
3.0.1.2 The bUS function decoder (UI6) generates one ot four command signals
by decoding wRITE and ADUR5. The commands are enabled by I/O (for an
1/0 mOdule), REQ (bus data is valid), ADDR4, AOON11, ADDRtO, and ADDR9.
In addition, DATA CLOCK, RO+WRT, AD/WRT SELECT, READ EN, and STATUS EN
are generated.
3.0.2 COM~AND LOGIC - CTU INTERFACE peA.
3.0.2.1 The purpose of the command logiC is to acquire command information from
the terminal bus when the signals are valio. The command information
completely specifies the operation as well as the selection of the CTU
Transport Assemblies. In addition, the command logic stops tape motion
thus Dreventing tape runoff when a hole is detected by the hole detect
logic.
3.0.2.2 The command signals from the terminal bus are latChed into U15, U21
(Pins 5 and b), and U24 bv the CMND CLK signal from the bus function
deCOder and timing loqic.

1325S
Cartridge Tape MOdule
13255 .. 91032/17
Rev AUG-Ol-76
Two versions of the Run command are contained in the command register
(UI5). SPUN (Servo ~un) is generated at U24, Pin 8 to enable the tape
motion decoder (UI6). SFUN is cleared if the hole ed~e detector (U23,
Pin 12) detects a transition into a hole. IRUN (Interface Run) is gen-
erated at U24, Pin 6 to enable the slow torward tape motion decoder at
U36, Pin 8 which generates ISF (used only by the encoder/decoder
logic). This prevents a discontinuity in encoded or decoded data when
movinq across a holp.. Bottl SRUN and IRUN are cleared after a system
reset.
The SRUN, FORWARD, and FAST Signals are translated in this block into
the signals SREV (slow reverse), SFO (slow forward), FREV (fast re-
verse), and FFO (fast forward) wnich are used by the servo electron1cs
on the Read/Write PCA.
The CLRINT signal is generated for the interrupt logic by U27, Pin 8
when the processor performs a status request, enablinq the STATUS EN
signal. The CLRINT signal is present for one cycle of SYS eLK after
STATUS EN goes low.
3.0.1 DATA PATH CONTROL - CTU INTERFACE PCA.
3.0.3.1 The data path control circuitry transfers data to and from the terminal
bUS. It also converts serial bits from the tape into bytes and con-
verts bytes tram the terminal bus into serial bits.
3.0.3.2 The data 1/0 buffer (U13 and U33) is an 8-bit register with a 2-port
input multiplexer. It provides one byte of butfering between the ter-
minal bUS and the serial data register.
3.0.31.3 In Record mOde, the data is loaded into the data I/O buffer from the
terminal bus, enabled by RO/WFT SELECT being low. (Note that the data
buffer is loaded with complement data since it is loaded from the
ground true terminal bus.) The data byte is loaded into the serial
data register after the previous byte has been encoded. The serial
data register is then shifted right (via REC DATA) into the encoder at
mid cell point (data transition position) and the encoder is comple-
mented at end cell point (phase position).
3.0.31.4 In Read mOde, the serial biphase data is read into the transition
detector (U28, Pin 14) ot the encoder/decoder logic and shifted into

13255
Cartridge Tape MOdule
13255-91032/18
Rev AUG-Ol-76
the serial data register at the appropriate time (corresponding to the
zone for data transitions). When the last data bit has been detected
at the decoder (there are 7 bits in the serial data register), the data
I/O but fer Is parallel loaded from the serial data register (shifted
right one oit). The data I/O but fer is sUbsequently output to the
terminal bus via drivers uti and U32, which are enabled by the READ EN
signal.
3.0.4 ENCODER/DECODER LOGIC - CTU INTERFAC~ peA.
3.0.4.1 This logic provides the timing and control functions for encoding or
decoding a data byte. The operation ot the encoder/decoder logic is
based upon the following theoretical analysis. The code that is re-
corded on the cartridge tape is Serial Biphase Mark COde (see below).
lheretore, the code shown below would be seen at the encoder output
(ut7, Pin 10) when In Record mode or at the transition detector (U28,
Pin 15) in Read mode. The code rules state that there is always a data
transition at mid cell, a 1-bit is a transition towards gap level while
a O-bit Is a transition away from gap level, and a phase transition
occurs at a cell boundary if adjacent data transitions are the same.
!
gap level__ ______ ____ ______ ___ _ ____ _
I t I I I I " I I
1 __ 1 1 ____ 1 1 __ 1 I_I 1 ____ 1 1 __
1 o 1 1 o o 1 o
* * * * * * *
*Indicates cell boundaries (125 microseconds)
3.0.4.2 Timing and control for the encode and decode operations is provided by
a
cell decode counter (U212) and a variable modulus (divide by N) coun-
ter (U213, U214, U312, and U313l which are both synChronous with the
bus SYstem ClOCK. The variable modulus counter generates a carry Qllt-
put at time intervals eqUAl to one bipnase cell period divided by eight
which increments the cell decode counter. By initialIzing both coun-
ters at the beginning of a biphase cell, timing points (for enCOding
phase and data transitions in Read mode) and timing zones (for decoding
phase and data transitions In Head mode) can be decoded trom the cell
decode counter and variable modulus counter carry output.