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PERIPHERAL EQUIPMENT 



7000-SERIES SYNCHRONOUS DIGITAL 
MAGNETIC TAPE TRANSPORTS 




FEATURES 

G Tape velocity to 25 ips 

G IBM and ANSI compatible 

G Phase encoded 1600cpi 9-track 

G Multi-density 7-track NRZI - 800, 556, or 

200cpi; or 9-track 800cpi 
G Tape cleaner 
G Forward and reverse read 



□ Capstan speed disk JAN 8 1974 

G Pressure sensitized take-up reel 

G Read-after-write dual gap or read/write 

single gap heads 
G Buffer arm, photo-translator 
G Exclusive "Edit" capability 
G Transfer rates to 40,000 characters per second 
G Dynamic electrical braking 







LOW COST, HIGH PERFORMANCE 
7 INCH REEL TRANSPORTS 

The Pertec 7-inch reel tape transport provides 
exceptional performance and reliability in the 
reading or writing of 7 or 9-track NRZI or phase 
encoded tapes. Engineered and designed to 
reduce operator and maintenance costs, these 
IBM and ANSI compatible tape transports are 
the front-runners of their class. Available in read- 
after-write and read/write models, they offer tape 
speeds to 25ips and data transfer rates up to 
40,000 characters per second. 



The Pertec 7000-Series offers the user superior 

reliability and ease of operation required by the 

following application areas: 

G Key-to-Tape 

G Optical Character Recognition 

G Data Acquisition 

G Point-of-Sale Devices 

G Data Terminals 

G Data Communications 













FUNCTIONAL DESCRIPTION 

The Pertec pressure sensitized take-up reel 
assures operator convenience and easy loading 
on all 7000-Series machines. The tape unit is 
designed to ensure IBM and ANSI tape inter- 
changeability, whether the application requires 
read/write single gap head models, or read-after- 
write dual gap head versions. Head and guide 
geometry is configured to be compatible with 
IBM's requirements so as to eliminate dynamic 
tape skew caused by normal tape slitting irregu- 
larities. Tape tension is also carefully regulated 
to conform with IBM standards in order to mini- 
mize potential interchange hazards arising from 
excessive tape stretching or cinching. 

Pertec 7000-Series transports are available in 
9-track versions with data densities of 800cpi 
(NRZI) or 1600cpi (phase encoded) or in 7-track 
NRZI versions with any two standard data 
densities (800, 556, and 200cpi). All models 
incorporate Pertec's industry standard interface 
which provides plug compatibility with the entire 



family of Pertec synchronous transports. 

The simple single capstan and tape path of the 
7000-Series provide the ultimate in tape handling, 
requiring, only 8%" of rack height. The unit 
includes data electronics, load point logic, tape 
motion control electronics, and a number of high 
performance features such as single potentiom- 
eter electronic deskewing, photo-electric buffer 
arm sensors and tape cleaner. The product has 
been formally qualified to both UL and CSA 
standards for operator safety. 

In support of its tape drive customers, Pertec 
offers interface compatible data formatter units 
which contain the data timing and control func- 
tions normally provided in an external tape con- 
trol unit. Through the simple data formatter 
interface, a user can transfer data to and from 
phase encoded and/or NRZI transports without 
having to concern himself with any of the tape 
related housekeeping or data recovery logic. This 
is all done within the Pertec data formatter. 



EQUIPMENT DESCRIPTION 

Electronics for the 7000-Series are divided into 
only two major subassemblies — tape control 
logic and data electronics. For simplified trouble 
shooting and repair procedures, both printed 
circuit board assemblies are hinged to provide 
convenient access to all components and test 
points. 

Basic Deck Assembly 

The construction of the basic deck assembly 
uses a cast aluminum deck plate on which the 
major subassemblies are mounted. All mechani- 
cal components utilize a single reference plane 
for precise location of critical tape path guides 
and the head itself. In addition, the precision 
frame serves as the base plate for the following 
major subassemblies: 

• Head and guide assembly. These important 
elements are precisely aligned to allow both 
forward and reverse reading without trouble- 
some and unreliable single shot adjustments. 

• Single capstan drive. Tape motion is controlled 
by a single capstan drive using a low inertia, 
dc servomotor. Velocity feedback from a dc 
tachometer provides the stable speed charac- 
teristic required to generate IBM and ANSI 
compatible tapes. For ease of service and pre- 
ventative maintenance, the capstan has a built- 



in strobe disk allowing speed checks to be 
made with either 50 or 60 Hertz ambient light. 

• Reel servo system. All Pertec 7000-Series trans- 
ports feature an indirect reel drive servo — a 
field proven principle resulting in minimum 
power consumption and, therefore, higher relia- 
bility for servo electronics. As another conse- 
quence, the replacement of a reel motor is 
greatly simplified and can be accomplished 
from the rear of the unit without removal of the 
front trim. The alignment and perpendicularity 
of the motor shaft is not critical ... a big plus 
in minimizing overall system down time. 

Tension arm position information is provided 
through a special Pertec innovated photo-trans- 
lator. This photosensor device generates a refer- 
ence voltage proportional to the angular position 
of the tension arm. Its signal activates the reel 
servo amplifier to maintain proper tape tension 
and reel servo speed. 

• Power supply. A modular power supply is 
mounted on the rear of the deck providing 
easily changeable transformer taps. 

• Control logic. All motion control logic, reel 
servo amplifiers, and power supply regulators 
are contained on a single printed circuit board 
assembly. 



2 L 



• Power and servo control. The reel servo ampli- 
fier and power supply regulator are contained 
on one printed circuit board assembly. Connec- 
tions to and from the printed circuit board 
assembly are through inter-connect plugs 
enhancing serviceability and ease of replace- 
ment. Multi-board spares are virtually elimi- 
nated in addition to the numerous connectors 
required when using smaller printed circuit 
board assemblies. 

The Pertec objective is to minimize interconnec- 
tions with their inherent unreliability by laying 
out critical signal paths and coupling functional 
circuitry on a large printed circuit board. 

Pertec's exclusive "Edit" capability is now a 
standard feature on all 7000-Series transports. 

The write current, tape motion, and positioning is 
controlled by this feature enabling the rewriting 
of selective records. This is a basic requirement 
in many data entry applications for achieving 
record update or correction without leaving 
extraneous noise in the inter-record gap. 

• Data electronics. Nine or Seven full channels 
of read/write electronics are provided on one 
printed circuit board. For NRZI transports, write 
data is presented to the transport as nine or 
seven data lines plus a clock and likewise, the 
transport presents the equivalent read channels 
plus a clock to the controller interface (excludes 
Model 7X30 which presents the peak detected 
pulses directly as they are read from the tape). 
In phase encoded versions, write data is pre- 
sented to the transport via nine data lines with 
a double frequency clock line, and the read 
signals presented to the interface are nine dis- 
tinct phase encoded waveforms. All input and 
output lines are TTL and DTL compatible incor- 
porating ground true levels. 

For single gap head transports (Models 7X20 
and 7X30), the emphasis in deskewing is placed 
on the precise alignment of the guides with 
relations to the head, therefore, eliminating the 
use of adjustable single shots providing an 
ideal transport from a service and tape inter- 
changeability criteria. 

In read after write, dual gap head versions of 
the transport (Model 7X40), electronic write 
deskew is provided through Pertec's unique 
digital deskewing technique where only one 
potentiometer adjustment is required at very 
infrequent intervals. When reading IBM com- 



patible tapes, the emphasis in read deskew 
remains in the precise positioning of the head 
guides providing minimal skew in both forward 
and reverse directions. However, in the write 
mode, the write head is deskewed using delayed 
digital techniques. 

Another innovation introduced by Pertec is 
"SKEW-SCAN" designed to reduce preventa- 
tive maintenance and service time. With this 
feature, the serviceman can adjust the total 
channel skew while observing a single test 
point. 



Front Panel Switches/Indicators: 



POWER 



LOAD 



ON-LINE 



REWIND 



WRT EN 



HI DEN 



FORWARD 



REVERSE 



Turns on and indicates AC power 

Energizes servo and advances 
tape to load point. 

Following load operation, sets 
transport to respond to external 
commands. (Note 1) 

Off-line function which causes 
reverse tape motion at nominal 
rewind speed. 

Indicates when write enable rings 
in on supply reel. (Note 2) 

Optional. Sets 7-track transport to 
read high-density data. (Note 1) 

Off-line function which causes 
forward tape motion at 
synchronous speed. (Note 1) 

Off-line function which causes 
reverse tape motion at 
synchronous speed. (Note 1 ) 



Note 1 . Not included on Model 7830 
Note 2. Optional on Model 7830 






. 



PERTEC 




AVAILABLE MODELS 

The Pertec 7000-Series transports are available 
in three basic models — 7X20, 7X30, and 7X40. 
A number of options are provided with each to 
meet any industry standard requirements. Table 
1 outlines the basic model numbers and specific 
capabilities regarding speed, densities, and the 
number of tracks. Following Table 1 is a listing 
of optional features. All units are shipped with 
a set of input/output connectors and a compre- 
hensive maintenance manual. 

Model 7X20 Read/Write 

Model 7X20-Series is a single gap head unit avail- 
able in 7 or 9 track, NRZI or phase encoded 
versions. This model provides select capability 
and has appropriate input/output gating for multi- 
transport daisy-chain operation. Output data from 
a deskew register in the transport is clocked 
with the read data strobe providing simultaneous 
pulses for most customer controllers. Available 
speeds are 6.25, 12.5, 18.75, and 25ips. The 
transport includes motion and control electronics, 
read/write electronics, read/write head, power 
supply, and dust-sealed cover door. 

Model 7X30 Read/Write 

A special low cost, single gap head model is now 



available in 7 or 9 track, NRZI or phase encoded 
versions. Designed specifically for data terminal 
applications providing minimal operator control 
panel features and a special read data electronics 
interface allowing the customer to package the 
data deskew register stage in his own controller. 
Adapted for single transport operation, all 
selected input/output gating is eliminated pro- 
viding an ideal configuration for cost conscious 
applications. Tape speeds of 6.25, 12.5, 18.75, and 
25ips are available. The basic transport includes 
motion and control electronics, read/write elec- 
tronics, read/write head, power supply, and dust- 
sealed cover door. 

Model 7X40 Read-After-Write 

For read-after-write applications requiring 7 or 
9 track NRZI or phase encoded capability, the 
Model 7X40 is available in speeds between 12.5 
and 25ips. The model uses a dual gap head with 
automatic muti-level read thresholds and has 
select capability and input/output gating for 
multi-transport daisy-chain operation. The basic 
transport includes motion and control electron- 
ics, read/write electronics, dual gap read-after- 
write head, power supply, and dust-sealed cover 
door. 




All Pertec 7000-Series transports have a unique 
tape loading feature. Since these models will 
often be used by unskilled operators, Pertec has 
devised a unique design which eliminates the 
take-up reel, making tape loading and tape han- 
dling extremely fast and simple. 



TABLE 1 





Model 
Number 


Number 

of 
Tracks 


Data 

Density 

CPI 


Data Transfer Rate (KHz) 




6.25ips 


12.5ips 


18.75ips 


25ips 


■D 
CO 
Q) 

DC 

CD 


7X30-9 

7X30-7 

7620-9 

7820-9 

7820-75 

7820-72 

7520-72 


9 

7 
9 
9 

7 
7 
7 


800 

200-800 

1600 

800 

800/556 

800/200 

556/200 


5 

1 .25-5 

10 

5 

5/3.48 

5/1.25 

3.48/1.25 


10 

2.5-10 

20 

10 

10/6.95 

10/2.5 

6.95/2.5 


15 

3.75-15 

30 

15 

15/10.43 

15/3.75 

10.43/3.75 


20 

5-20 

40 

20 

20/13.9 

20/5 

13.9/5 


< 

co 

CO 
DC 


7640-9 

7840-9 

7840-75 

7840-72 

7540-72 


9 
9 

7 
7 

7 


1600 

800 

800/556 

800/200 

556/200 




20 

10 

10/6.95 

10/2.5 

6.95/2.5 


30 

15 

15/10.43 

15/3.75 

10.43/3.75 


40 

20 

20/13.9 

20/5 

13.9/5 



OPTIONAL FEATURES which must be defined at the time of order: 

• color coordination panel. An add-on, adhesive backed switch panel providing the customer with the 
capability to coordinate the transport to his own color scheme. Standard panel insert is pearl white. 

• swing-out hinge. An optional hinge is provided for installations not using shrouded or removable 
panels. 

• special speeds. For speeds other than the standard 6.25, 12.5, 18.75 and 25ips, consult with factory. 

• custom logo. 

• 220 vac operation. Normally wired for 115 vac operation — the customer may specify 220 vac for 
European operation. 

• status gating. Provides transport status when the transport is off-line (all models except 7X30-7/9). 

• transport ready. Forces transport ready status without completing load sequence (all models except 
7X30-7/9). 



PERTEC 




i 



SPECIFICATIONS 



Data Density 

Tape Velocity 

Instantaneous Speed Variation 

Long Term Speed Variation 

Start/Stop Displacement 

Start/Stop Time 

Number of Tracks 

Recording Mode 

Inter-Channel Displacement Error 



Tape Specifications 

Tape Tension 

Electronics 

Tape Unit Interface 

Rewind Speed 

Reel Size 

Weight 

Mounting 

Power 

Operating Temperature 

Altitude 

Dimensions 

Height 

Width 

Depth (behind panel) 



1600cpi Phase Encoded 
800,556, 200 cpiNRZI 

25, 18.75, or 12.5ips Read-After-Write 
25, 1 8.75, 1 2.5 or 6.25ips Read/ Write 

±3% 

±1% 

0.19 inch ±0.02 (4.83 mm ±0.51) 

30.0 ms ±2.0 at 12.5ips inversely proportional 
to tape speed 

7 or 9 IBM compatible (Models 2400, 729, 
and others) 

NRZI IBM compatible 

Phase Encoded IBM and ANSI compatible 

150 microinches (3.8 microns) (max) at 800cpi 

and 1600cpi 

200 microinches (5.08 microns) (max) 

at 556cpi 

0.5 inch (12.7 mm) wide. 1.5 mil (38.1 microns) thick. 
Computer grade. 

7±1 ounce (198.5 grams) 

Silicon Solid State and 930-Series DTL Logic 

DTL Logic (low true) 

50ips (nominal) (for6.25or12.5ips) 
100ips (nominal) (for 18.75 or 25ips) 

7 inch 

25 lbs. (11.4 kg) 

Standard EIA Rack Mount 

1 1 7/230 vac 48 to 400Hz 70 watts 

35°to113 F(2°to45 C) 

to 20,000 feet 

8.75 inches 
19 inches 
8.75 inches 



I 




i- 

r 

a 



l 



WIDTH 19" 



-« DEPTH 8.75" - 



PERTEC 




INTERFACE DESCRIPTION 

The connection to all Pertec synchronous trans- 
ports is through three (3) interface connectors. 
The interface has been designed to allow multi- 
transport daisy-chain condition operation and, 
therefore, the true logic condition is set at ground 
level and false condition at 3 vdc. See interface 
circuits for appropriate drivers, receivers, and 
terminating resistors. 

The input/output lines and their description is 
categorized into four (4) functional groups as 
follows: 

1. TRANSPORT CONTROL INPUTS. 

SELECT (SLT). LEVEL, when true, remotely 
conditions transport and enables all input/out- 
put signals (not available in 7X30 versions). 

SYNCHRONOUS FORWARD COMMAND 
(SFC). LEVEL, when true, causes forward tape 
motion. 

SYNCHRONOUS REVERSE COMMAND (SRC). 
LEVEL, when true, causes reverse tape motion. 

REWIND COMMAND (RWC). PULSE, when 
true, causes reverse tape motion at rewind 
speed. 

OFF-LINE COMMAND (OFFC). PULSE, when 
true, causes tape transport to be placed under 
manual control (not available in 7X30 versions). 

SET WRITE STATUS (SWS). LEVEL, when true, 
20/xS after SFC conditions write current. 

DATA DENSITY SELECT (DDS). LEVEL, when 
true, remotely selects high density — 7 tracks 
units only (not available in Models 7X30, 7620, 
and 7640). 

OVERWRITE (OVW). Level, when true, con- 
trols write and erase current turn on or turn off 
for selective record updating. 

2. TRANSPORT STATUS SIGNALS. 

READY (RDY). LEVEL, when true, indicates 
transport is on-line and not rewinding. 

ON-LINE (ONLINE). LEVEL, when true, indi- 
cates tape unit is ready for on-line operation 
(not available in 7X30). 

REWINDING (RWD). LEVEL, when true, indi- 
cates unit is in rewind cycle (not available in 
7X30). 

END OF TAPE (EOT). LEVEL, when true, indi- 
cates end of tape photo tab is being detected. 



LOAD POINT (LDP). LEVEL, when true, indi- 
cates tape unit is at load point. 

FILE PROTECT (FPT). LEVEL, when true, indi- 
cates a reel of tape with its write enable ring 
removed is loaded on tape unit. 

DATA DENSITY INDICATOR (DDI). LEVEL, 
when true, indicates the selection of high den- 
sity (not available on Models 7X30, 7620, and 
7640). 

3. TRANSPORT DATA INPUTS. 

WRITE DATA STROBE (WDS). PULSE, when 
true, causes data on input lines to be recorded 
on tape. In phase encoded transports, two 
clocks are required per character to copy the 
waveform on tape. 

WRITE AMPLIFIER RESET (WARS). PULSE, 
when true, generates LRC character on NRZI 
tape. In addition, it is used to signal current 
turnoff when in the edit mode. 

DATA INPUTS (WDP, WDO-7/8). LEVELS, one 
input line for each track on tape. Used in con- 
junction with write clock to record data. 

4. TRANSPORT DATA OUTPUTS. 

READ DATA STROBE (RDS). PULSE, when 
true, is used for clocking data lines out of trans- 
port (not available on Models 7X30, 7620, and 
7640). 

READ DATA OUTPUT (RDP, RDO-7/8). 
LEVELS, one line for each track of data on tape. 
Data is assembled in parallel form and clocked 
out of tape unit with read clock. In phase 
encoded, the output signal is a replica of the 
data input. In Model 7x30, the output signal is 
the peak detected signal non-staticised. 



LEVELS: 



True = 
False 



Low = 
= High 



to 0.4V 

= 3 VDC 



PULSES: Amplitudes as above, Vsec. typical 
width edge transmission delay over 20 feet of 
twisted cable in less than 200 nsec. 



DTL 944, TTL 7416, 
OR EQUIVALENT 



CUSTOMER/ 
PERTEC 



DTL 936, 946, OR 74-SERIES 
TTL, OR EQUIVALENT 




330B 

CUSTOMER/ PERTEC 



NOTES 



( 



Policy Note: 



PERIPHERAL EQUIPMENT Regional Sales Offices: 



Pertec reserves the right to change specifications at any time. It is Pertec policy to improve 
products as new techniques and components become available. 

Los Angeles: 9600 Irondale Avenue, Chatsworth, California 91311, (213) 882-0030 TWX (910) 494-2093 
Chicago: 6300 North River Road, Suite 102, Rosemont, Illinois 60018, (312) 696-2460 
Boston: 235 Bear Hill Road, Waltham, Massachusetts 02154, (617) 890-6230, 890-0126 
London: 21 London Street, Reading, Berkshire RGI 4PR, England, Reading 582-115/6/7 



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D0714C 11-71 Printed in U.S.A.