1800.6_Datum_5091_Tape_Formatter_Instruction_Manual 1800.6 Datum 5091 Tape Formatter Instruction Manual

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FORMATTER
SYSTEMS

................

••••• ••••

D_ .. : ... ""' ........... 1
.....

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Equipment Division
Model 5091
NRZI Formatter
Instruction Manual
Publication No. 1800.6

(sERIES 5091 MAGNfnC TAPE FORMAffiR

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SYSTEM~

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.....

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• Selection of NRZ or phase-encoded formats with or without
computer adapter interfaces and software
• Availability of adapters for a wide range of mini-computers
• Control of as many as eight 7· and/or 9-track tape units (four
per formatter)
• Compatibility with computer software while handling seven- or
nine-track, m!.!!tipte-speed; multiple-density tapes
• Expandability in the field simply by adding logic cards
• Front-panel controls and indicators
• Internal power supply adequate for any desired configuration
• DTUTTL IC formatter logic to assure maximum compatibility
• Availability of blank circuit cards for "design your own" adapter
• Etched circuitry for highest reliability
The DATUM Series 5091 Magnetic Tape Formatters satisfy all reQuirements for tapecontrol in mini-computer instaHations. The result of years of mini-computer interface
experience. the 5091 Series consists of controls. cabinet. chassis and power supply
and the formatters and computer adapters for which they provide slide-in accommodation. Whether the need be for a Formatter. for a Formatter with provision for a
user-designed Computer Adapter or for a compiete Tape Controiier. the DATUM
Series 5091 will provide the ideal instrumentation.
This modularly designed series generates and reads IBM-compatible NRZ and
phase-encoded formats and, with the addition of a Computer Adapter, will control
as many as eight magnetic tape units. If desired. off-the-shelf Computer Adapters
and software are available that will accommodate 90% of the commercially-available
mini-computers.
The Series 5091 design concept, a product of DATUM's wide experience in interfacing with different mini-computers. permits a high degree of compatibility with
the hardware/software designs of the various computer manufacturers and with
existing user-developed software. When ordered with a Computer Adapter installed,
the 5091 instrument thus becomes a Tape Controller system custom-designed. both
in hardware and software, to the mini-computer with which it is to function.

FRONT-PANEL CONTROLS AND INDICATORS
TAPE UNIT SELECT switches allow any unit number (0, 1, 2. 3) to be aSSigned to
any tape unit (A, B, C or D). MODE switch atlows manuat override control over parity
and density selection for seven-track tape units in addition to standard program
control. PARITY switch allows selection of 000 or EVEN parity. DENSITY SWitch
allows selection of HIGH or LOW density. VISUAL INDICATORS display the tape
unit, formatter, parity and density selected.

;

EQUIPMENT CONFIGURATIONS
The basic Series 5091 Controller/Formatter will house and power three large circuitcards. One card slot is reQuired for NRZ formatting, two card slots are reQuired by the
Phase-Encoding Formatter, and one card slot is necessary for the Computer Adapter.
Therefore. two enc-!osures are nec.essary for some confiQurations.
FORMATTERS REQUIRED
SYSTEM
CONFIGURATION

PHASE
ENCODED·

MHZ

One to tour 7- and/or ~rack-NRZ tape units,

. One

One to four 9-track
1600 PE tape units

5091-1

Customer-Supptied

5091-2

Customer-SuPPliect

5n1-3

Two~

Customer.«SUQPlied

5C)9.1 . . . . .

One-

Customer-SuPpliec:1

5091-5

One

5091-6

OM'-

5091-1(1

One

5091-7

Or.;;

!O!1-e'"

One

5091-e-

TWO-

One to eight 9-track
1800 PE tape units
O~to four 7- and/or 9-track NRZ and
One to four 1600 PE t81)e units

One to four 7- and/or 9-track
NRZ tape units

'. >OneOne

One to four e-.track
1800 PE tape- units-

One·

One to eight 7- and/or
g,.track N RZ tape units

Two··

One to eight 9-track
, 600 PE tape units

'9'._._'"
...u

em. to four 7- and/or 9-track NRZ tape,
units; one to four 1eoo~ tapeunlb
,

>.

an..

- One·
.

ADAPTER

ORDER
DATUM
NUMBER

Customer-SuPJ)lied
On.-

One to eight 7- and/or~rack
NRZ tape-units

COMPUTER

",

-U_twOCam'8leta;-:'**TwO~~tO asinole ~ Adapter..

SPECIAL "DESIGNED-BY-DATUM" FEATURES
1. PROVEN HARDWARE AND SOFTWARE. DATUM has delivered more
than 150 complete computer-interfaced systems that included computer
adapters and software. TypicaJ computers interfaced are:

erase-then-write; Seven-track filemark in nine-track mode control. BCD
1o-to-zero conversion control.

a PROFIT BY OUR EXPERIENCE. If you

wUl be designing your own Computer
Adapter, you ·will find that the features
already designed into the DATUM Formatter will save you as many as 25% of

Computer Automation 816; Data General Nova; Digital Equipment Corp.
PDP-8,8/e, ali, SIL. 9, 9/L. t1~ 12, 15;

'. Hewieii-P8ekard 2114, 21;5, 2116;
Honeywell H316, H416, H516. H 124A;
IBM 1130; Microsystema 810; SDSI
·XDS.CE16 CF16; Varian·620/i.
y

the. chips YOy w-ouJd r.erma!!y. reQuire
in your Computer Adapter.
4~

FRONT PANEL INDICATORS, UNITSELECT SWITCHES AND PARITYI
DENSITY SWITCHES.

2. DESIGNED-IN SOFTWARE COMPATIBILITY. Multiple record spacingS. NO ADJUSTMENT POTENTIOMwith· one' command; Single-command
.ETERS. NO ONE-SHOTS.

5091

NRZ FORMATTER

ClRCUITBOARD.

·t~'~·•.·tOi.Read;·.anc:t Writa mak&' data
entire,period:be.tween Read.strobe&· They will also· accept Write
"2~data·at . any..time:tt\8,·COIT1J)llter outptrtsth&,character.;. Noextemal, storage registers
:~~,
requiredin~u~!$.Compu~;adapter; ,'. .
.
"
'.

£\w·.·· "tEClA[;; BUFFEtt
>.avaitable.fOt' the

. . :are

ANY'TWOT_~:car;:_.accommodated·~ one Forma1ter:,witbin a~,of,.a2a:_.1t2;$jnChetlJ)8f'~seconth.~btewitb'entire PEe or

" :'A MIX OF

Wang ~.I~r:~at~~·~:}::;:;,3~:,.'·:"·:····::· ',:.:.:

", . ;.:-

. 'A MtX"OPDlFFERENT"HiGHlIiOw aENsnY'PAlR&ot:t..traCiturtiis onane NRZ .
formatter. For example;' en& tranaport~.cQUltt. ~·800J55&.bpt~a.. second' transport
couk)' be: 556/200 .bpi•. '

.

'c

~,::;:, _

::"DATA 1"flANsFeRnMINGERROR~

.'

. . . . .. ' "

'... .'

. -'.

.

-

siatua bit presenfed·tQ-the.interface if. aRead

or Wntedatatransfer.is t1Ot,~bafom·tbe ne-xt-:·~·or ~Write" strobe

. , "'OCCUrs.

". ·'-"':;~~/"{'>:';··::?,:;:'(··<1:'r:1~,~,,,,,-.~:\,:,~;::"~::{i;~-::}~t<-;o.<

;:. ' .

FORWARD·ORREVERSE READtNG-witit··complet&&aor~hecklng'. in either
. directi~lk.., " .
.~ ;:)·~~:;'.·:i~\:~:~r)~:7;l;';:}~'~{~~~~-';;:';/:~::~< ;:_cI::;;:,t~,·;:> :;...
FORMAneK DlREcn..Y.COMPA11Bt.E withalt~mputer timing
l'8Quitetneuts;. lnterf8ce-cOrrtrot .puIsaSicanbeaminimun'J·of1OQ·nanoseconds wide.
The Formatter· intemally·inteI1ocka:~signal8; totha-tape units.
.

• !.;.;~ec)NT1NtJlOtJlS· ReAD

OR wMni'wABarrt {gapping uon-the.-fty") provided by

the-Forma1tter:tooptimiza~ata~11It8J[

NO FREQUENCY ADJUSTMENTS ARE NECESSARY. Timing is referenced to a
crystal-controlled oscillator followed by a divider chain that selects the desired frequencies. Any mixture of any two frequencies may be selected at the time
of purchase. Since all delays are taken from this timing chain, no one-shots are used.
No adjust-pots are used.
READ, WRITE AND MOTION CONTROL LOGIC included in the Formatter. VRC,
LRCe, CRCe generated by the NRZ Foimatlei. VRC and LRCe checked. FilE
MARKS written and recognized by Formatter.
S!MP~E TAPE UN!T EXPANS!ON in the field by adding additional tapa units as thay
are needed.

TIMING FOR IBM-COMPATIBLE INTER-BLOCK GAPS and correct head positioning between records.
SINGLE GAP (write/read) AND DUAL GAP (read after write) transports can be
"mixed."
FIXED-LENGTH ERASE COMMANDS and combination "erase then write" command
provided by Formatter.
SOFTWARE COMPATIBILITY MAINTAINED with existing computer manufacturer's
software, by providing ability to erase a three-inch gap and then, with one command,
write a Record or File mark. Also with one command the user can space over any
number of records, forward or backward.
NO LOCK-UP AT LOAD POINT when the Formatter is commanded to backspace or
Read Reverse. Command rejected and Reject status returned to get attention of
computer.
PHASE-ENCODED FORMA'iiER CONiAINS ALL L.OGIC necessary to generate
the pre-amble, post-amble, phase-encoded data and file mark patterns for recording.
Read logic allows complete recovery of Read data, including data decoding, buffering, error and file mark detection and error correction.

IF YOU ARE TO DESIGN YOUR OWN ADAPTER ...
TO ASSIST IN YOUR OWN COMPUTER ADAPTER DESIGN, blank printed-circuit
boards are available with which to build your own Computer Adapter or logic card.
These boards plug directly into the existing enclosure, which provides complete
interconnection. The boards can be supplied with as many as 196 Ie sockets already
mounted. Further, to assist in the development of your Adapter logic and software,
DATUM can provide logic diagrams and actual software.

5091 TAPE FORMATTER, PANEL OPEN. SHOWING NRZFORMATTER BOARD
(TOP) AND PHASE ENCODED FORMATTER BOARDS (BOTTOM) INSTALt..ED.

5091 TAPE FORMATTER

BACK PANEL

EQUIPMENT CONFIGURATIONS
The basic Series 5091 ControllerIFormatter will house and power three large circuitcards. One card slot is required for NRZ formatting, two card siots are required by the
Phase-Encoding Formatter, and one card slot is necessary for the Computer Adapter.
Therefore. two enclosures are necessary for some confiQurations.
FORMATTERS REQUIRED

.V$TE.

...... 21:

MHZ

CONFIGURAnON
One-to four

T~

ENCODE~

and/or s.track

-

One _-

_NRZ tape units

ORDER
eo!!p'....rreR
ADAPTER

-CusIOmer-SuppUed:

Or.. to four· 9-triiek
1600 PE tape-units-

One- -

One to aiQ.ht 1· andl-or9-track
-NRZ tape units

NUMBER
5011-1
5OSt1~Z

-SOS1·3_

One to elght-9-track<
1800,PE tape- Unfta '-

One to-four T· and/or9o-track NRZ.and
- Oneto-four 1800 PE tape units

om....

- - One to four To. aftdfore..trackc'_'·

- 5091 ..

..~~ One.

- _NRZtape units

One to foU, Q-track:-."-, 1800PE tapeunits:":--'- .

One- to eight 7- _lor'" , _,- ----- . - SHrack MAZ- tape,unitS--

- ~ >;'..!.:- ::

~

.'.

.

.

'-;TWO';;'.

5091-7

. " One to eight~.9-track: -,;:
. 1600 PE taP.e.unit's'-' '-~ ,

5O$t-8-

-Onetofour7';' and/or- 9-tnIckNRZ tape.

- .','. units: ~ to,four1SOO P£ tape-units'

o~-

-.:.u...two~_'·~Wo~~ned-to

·. .•··.·.~ui~~~8~,22t':,;'t}~~·';'

5091,,'-

••nv..~btrAdapter:

-SPEClFlCAnONS,,-

POW8ArSOORltl~~"·,,<,,,,,,,,··,,,,,,,·~1~~ii~~L~~2iG

TABLE OF CONTENTS
SECTION

PAGE
~rurDAI
v-\_

Q .... , .....

1• 1
1.2
1 .3

1.4
i

r

I.;;}

II

III

vn~~rDIDTln~
...
I ' • • v ....
~...,.,

A~n
•• ...,

~,

CD~rl~lrAT!nMC
...,. _ ....... ..,,-,.. I v.".",

.........
Controls and Indicators
..........
Specifications • • • • • • • . . . . . .
...
MagnetIc
lape ....
.....

1-1

Functional Description ••

1-1

Physicai Description

i-3
1-3
1-7

~...

e

e

~

ronr~ts

....
...

INTERFACE
•••••••••
2. 1 I ntroduct i on • • • •
2.2 Formatter/Transport • • • • •
2.2.1 Fonmatter to Transport
2.2.2 Transport to Formatter • • • •
2.3 Formatter/COmputer Adaptor Interface ••
2.3.1 General • • • • • • • • • • • •
2.3.2 Formatter to Computer Adaptor.
2.3.3 Computer Adaptor to Formatter

2-1

2-1
2-2
2-3
2-5
2-7
2-7
2-8
2-18

THEORY OF OPERATION • • • • • • • • • • • • •
3. 1 J n t rodu c t ion • • • • • • • • • • • • • •
3.2 Block Diagram • • • • • • • • • • • • • • • •
3.2.1 Command Register and Valid/Reject logic
3~2.2
CBUSV. • • • • •
• ••
3.2.3 Transport Control • • • • • • •
3.2.4 Fonnatter Select • • • • • • • •
3.2.5 Tape Unit Select • • • • • • • • • • • • •
3.2.6 State Counter and Main Control
3.2.7 Status Register • • • • • • • • • • • • • •
3.2.8 Partty Control • • • •
• •••••••
3.2.9 Pari ty Error Detect • • •
• •
3.2.10 Character Parity Check
••
. 3. 2. 11 LRC Check • • • • • • • • • • • • •
3.2.12 Read Data Storage Register
••••••
3.2.13 Read Clock Activity Sense
••••
3.2.14 File Hark Detect • • • •
• ••
3.2.15 Read Control Logic • • • • • •
3.2.16 Write Storage Register • • • •
3.2.17 Parity Generator • • • • • • • •
3.2.18 Write Data Select Gates • • • • • • • • • •
3.2.19 File Hark Generator • • • • • • • •
3.2.20 CRec Generator • • • •
3.2.21 Write Control Logic • • • • • • • • • • • •
3.2.22 Crystal Oscillators and Tape Speed Select.
3.2.23 Density Select • • • • • • •
3.2.24 Data Transfer Control • • • • • • • • • • •
3.2.25 Delay Counter • • • • • • •
3.2.26 Inter Record Gap Detector

..

....

3-1

3-1
3-3
3-4
3-4
3-4
3-4
3-5
3-5
3-7
3-7
3-8

3-8
3-8

3-8
3-9

3-10

3-10

3-11
3-12
3-12
3-12

3-13
3-13
3-14

3-14
3-15
3-15
3-15

TABLE OF CONTENTS (Continued)
PAGE

SECTION
III

THEORY OF OPERATION (Continued)

3.3

3... 16

COI11'11ands ~ • • • • • • • ".'." • • • • •

3.3.1 Basic Commands
••••
3.3.2 Command and Hode Combinations •

3-16
3-18

3.4 State Fiow • • • • • • • • • • • • • • • • • • • •
3.4.1 Simplified State Flow • • • • • • • • • • •
3.4.2 Detailed State Flow • • • • • • • • • • • •
3.5 Command Execution and Timing • • • • • •
3.5.1 C l e a r . . . . . . . .
• ••••••
3.5.2 Rewind • • • • • • • • • • • • •
3.5.3 Write FIle Hark (7 Track)
3.5.4 Wrt te Fi Ie Mark (9 Track) • • • •
3.5.5 Forward Space One " Record. • • • • • •
3.5.6 Backspace R~ Reco~d • • • • • • • • •
3.5.6 Write-One-Record (7 Track) • • • • • • • •
3.5.8 WrtteOne RecoC"d ••• ~'. • • • • • • • • • •
3.5.9 Read One Record (7 Track) • • • •
3.5. 10 Read One Record ..; • •
3.5.11 Erase 3 Inch Gap •••
3.6 Continuous Write or Read • • • • • • • • •
3.7 Options • • • • • • • • • • • • • • • • • •
3.7.1 Tape Speed • • • • • • • • • •
3.7.2 Dual Densities
••
3.7.3. Single/Dual Stack Head Selection • • • • •
3.7.4 BCD 10 to Zero Converter • • • • • • • • •
3.7.5 7 Track File Hark Code Write/Read on

...

f'

9 Track Unit

.,.

•

•

•

•

•

....
•

•

••••••••

3.7.6 No Parity Error for File Marks

3.7.7 Rewind Interrupt • • • • • • •
3.7.8 Formatter Address Select • • • • • •

3.8 De 1ay Times. • • • • • • • • • • • • • • • • •
IV

DRAWINGS

It

•

•

3-2i

3-21
3-26
3-26
3-26
3-28
3-30
3-32
3-33
3-35
3-35
3-38

3-39
3-42
3-42
3-42
3-43

3-44
3-47
3-48
3-48
3-49
3...49

3-49

3-50
3-50

TABLE OF CONTENTS (Continued)

LIST OF FIGURES

PAGE

C'1r-IIDI:
I
IWW.'"

1-1

Rear View Formatter Connector

1-3

Interface Circuits
7-Track Format
9-Track Format
NRZ I Formatter Block Di agram
Simplified State Flow
Detailed State Flow
tiC 1eart' Ti mi ng Di agram
Rewind Timing Diagram
Write File Mark Timing Diagram (7-Track Mode)
Forward Space One Record Timing Diagram
Write One Record Timing Diagram (7-Track Mode)
Read One Record Timing Diagram (7-Track Mode)
Example Tape Speed Selection
Density Selection

1-4

1-5
3-1
3-2

3-3
3-5.1
3-5.2

3-5.3
3-5.5
3-5.7

3-5.9
3-8
3-9

1-4
l_t:
. '"
1-8
1-9
1-10

3-19
3-22
3-25
3-27
3-29
3-31

3-34
3-36
3-40 .
3-46

3-47

LI ST OF TABLES·
TABLES
2.... 1
2-2
2-3

Fonmatte~rrransport(s)

3-1
3-7
3-7.8
3-9
3-10

Commann and Mode Combinations
Tape Speed Selection
Fonmatter Address Selection
Nine Track Pre/Post Delays (75 ips)
NIne Track Pre/Post Delays (45 ips)
Nine Track Pre/Post Delays (37.5 ips)
Ntne Track Pre/Post Delays (25 ips)
Nine Track Pre/Post Delays (12.5 ips)
Seven Track Pre/Post Delays (75 ips)
Seven Track Pre/Post Delays (45 ips)
Seven Track Pre/Post Delays (37.5 ips)
Seven Track Pre/Post Delays (25 ips)
Seven Track Pre/Post Delays (12.5 ips)

3-11

3-12
3-13
3";'14
3-15
3-16
3-17
3-18

Interface
Formatter/Computer Adaptor Interface

Conmands

,tJ

2-9
2-20

3-19
3-45

3-50
3-52
3-53
3-54
2-55
3-56

3-57
3-58
3-59
3-60
3-61

INSTALLATION INSTRUCTIONS
MODEL 50g1 FORMATTERS

UNPACKING AND INSPECTION OF FORHAITER

l.

a.·

Visually inspect the Fonnatter to ascertain that there has been
no physical damage.

Should damage be observed, the carrier must

.be notified within ten days if an insurance claim is to be made.
" b.

Hake certai'n that a 11 boards are plugged f j nn 1y into the mothe r
boards •.
Make certain that the speed chip (Assembly 701587) is installed.

c.

On~

the NRZunits, the speed chip is located on the lower right-

handcorne'r .(FS) of the center board (Assembly 76t34) of the

:,threes~'ller board~ mounted on the left side of the motherboard.
'(In>lbe. Phase·Encoded'unlts,. the, speed ch·i pis located 'on the

··fi~t:-"'u.~:.cora;t,'~(D28l

.

-

:,.,

-'.'.- >.c

the. tefHlOst: of

of

the three

'.mounted·onthe mQtherboard.

.". , . ' . : ' . . . " . ,

.

..

.

bcM"fC~;:-'11le:'$I:"d-:;l~jf:I) .:'b".,~.c."jr,,t._.1t01I.'e-:;',i! ·;·-';'g;~t$~:'~~~~~;~afl~. ~':.:.i s.1 ne l·uded·'wi th each· Fonnattel".
<;::
•.

~

, .. ',. . ' , .... ,"

" '.'. '.':'-';:~':"'._'.-''''.~~.,-.~~'' ~:!;,:.?-":"_~::>~~~~:::~i' .

~: ... ;:~~

::'l ...

F.or~t:ter'·lS'~:rIt:,thff·
#~;;~;<~ .:.1?:;. ~.~'/ ...~ <:.::::- .. ~" .~-::.:.:~.. ~.' ':.~.~":'. ~;.~'t-~~
~:,~,r'1';~~.~··~f~-. :'~.:'. ~,;."'"

,.:

:",

" .. ,

.:.'<~""'.".'~.':> :'..'

.•..

,'.

.

.

.

rack: by. lining its four mounting holes up with
," . ":. ~. ' .

'

':,~':;;;:~:~~~e4:fIIIM.m·~ln9:~~tes"_Jo: ,ttte, r~

;;;~~iijt~if~S;~;$~i'>~i~;jc{-~;.:d

.

and

'I'

s~rit'9" it.' wi th the gromnet guards.

The Formatter requires 2411 of rack space behind the moun-ting surface.
This

23"~deep

rack allows .for cable bend at the rear of the Fonnatter.

HOUNTING THE. 'TAPE UNITS
.At r tape units require rack mounting.

Mounting of the tape units in

CI;'standard 19" RETHA rack is desc-ribed in the tape unit manual.

The 5091

Ft)nnatter.and.the- tape. uni ·ts must be mounted· such that five-foot tape-cab I e
lengths will "daisy-chainllto all

units~

This requires that all units be

mounted either directly above, belOw or- beside the previous unit in the chain.
(See sketch below.)

I

Tape

Unit

Tape

Tape

I Unit

. This
#1 :" ...... #2· ;' ~~ cable
,

Unit
\

1 til

--r.; ~

... •• ..
. . .~----t Tape

U;;t

NO!

'. ~

. .- .

r

length

exceeds
th

5'

al ~owed

The standard mul t iple-tape-unit tldai sy-cha inti conf igurat ion requi res
termination resistors to be deleted from all

the power to the iast tape unit must be
is in use.

.!'!.!:!!

switct~d

the last tape unit.

Therefore,
..... :+
, ...

+~ .............

to

...

gt'~

This suppl ies power to the terminator.
Tape Un it Tenninat ion Opt ion"
The Tape Unit Termination Option ,provides termination c"ircuits on

printed-ci-rcuit boards that plug onto the last tape unit.

This Option enables

pcMer: to be applied from any tape unit that has power 1I0N".

option.allows termination resistors to be deleted from

Installation of this

!.!.L tape

units and allows

operation to' continue. even when the last tape unit becomes defective to the extent
". -.,that . . its, 'f)C*ercannot be turned on •..

"4ii

INSTAlLAT ION, .HODEL 509 J FORMATTER ...
""T.he~,i~nstallation

hardware consists of Cable 960076. the single-connector

·,;,en . .'". ;/~<~ .;....., .-~
-.'
.
. . . ____. . ", "
-,the;;..'CCrit:I'~Jler-:;·~>'flef<6/3:2~":s:erews.' are·supp lied' to secure this connec-

~"~".~~~~~.'.~,,~.;.'":

".

.~~~:

<'.,4. >~

'ar1ti1G:ne~s~~ t~;:jl6:\~the" w~'ng' Tape, Un i. t , which is

."".t",.;;;;h,;.;>.i'·';·"'a.·:·-"·--L:.·:-:':'~t.:'co~;~i~~t.·f"'r~ ~!Jl&')' on-- the

second·pr i nted-c i rcu i t

'-i"~,;.~~~;~!!~l~ back of'thaWang uni t.

. ._....... ,_,. . . . .

As
.~;.t\;-f.~.~:_I(i':;"h.tn:~~hat- the Cab Ie enters from the

~tI. .Jrf..·.•.,n4·-·~Il~··tif'::'~"~',~:thattha "N~ stalped on
';.:. •.g"·lt-QRfGtes:t.he'end·,fUnhest.'" ·into the tape unit •

.-~tS~~·~2;t~(i!t~i,~:~;;~/.;,~,.""

'~"'."':,;~"C"';' 'C' ' '~:,':~;i·. i~· ;';~i~;~:'~ J!~ I~I~, '" .'.' "

the connector

2.

Connector AP103 attaches to J6 on the Wang Tape Unit, which is
the upper connector (marked "J611 ) on the right-hand board (as
you face the back of the tape unit).
that the

~ble

Ascertain, as in Step i,

enters from the top-end of the connector and that

ItA" is stanped on the connector-end furthest into the unit.

3.

Connector AP102. attached to Jl, wh ich i ~ the bottom connector
on the board- designated-- in Step 2.

Ascertain that the cable

-enters the lower end of the connector and that

ItAII

is atamped

.on . the connector-end furthest into the unit.
To WANG PHASE ENCODED Units (F igure 3)

I., - -'Connector P16 connects to jack JI6 on the upper lead ing edge
,of·thefirs.tprinted circuit board from the left, as you face
~_;backof

-._:':;~ '-;,;:.",:-,,~~~hat

the Wang unit.

t.h8· cable enters

As shown in Figure 3, make certain

from the upper end of the connector and
designates the end furthest

the rightun it) • ~;jt~:;.;;~.~~In'1~IFq;..:;~hiatf:~:_ttte·

connectot-end stamped "AII is

the, connector-

~_!\!1~~!!J~~~!,!,!~',,'.··tl1_'~;~I2~;~~l£i~~J~;~i:.),· ,. .
~_~~',""l~uz:"attad"${tc('Jl02:rthe- top. connector

:?"t~z;.-~~tMilplr-te:1:: ~I.I;··""'LII."t{&oa;d~~·~':'Make.- certain
:;'~:,'1!,~&:,,::,>;:-, ;:,," ·;:c:fi~.

·.r-":· ;,J;;-; .', .

"v"-; :_~.",";, ,".'3'·!~.ri~ l$t~ ~ "· ,. '.

._ .

;.:'f'·Af2~t~~;!~:;).t#~"fJ5i~r?~f~~J~,f.';::
.;<~; -".--,~-~. :~~::;,.~
_,"'1;,~:">I.-!<.;;.-~.o'.':,,'
••
:;-~7i,:~"··;
,:i::; ' ; '-!

, ••

.

...

on the innennost

that the. end of the

connector stamped IIAII is toward the top of the tape unit, which
means that the cable enters the connector from below •

. 2.

Connector AP103 attaches to Jl03~ the bottom connector on' the
innermost (Read/Write) circuit board.
that the end stamped

l.

ItAII

Position the connector so

is. closest to the bottom of the tape ·unit.

tonnector AP101 attaches to JI01, the bottom connector on the
outermost (control) circuit board.

Pos ition the connector so that

the end stamped "A" is closest, to the bottom of the tape unit.

,

~.,

...

-,-

,:~F-IGURE

'l.

PHASE ENCODEDTAPE- TRANSPORT
'CABLE. CONIECTIOMS:;
'?; ...

-7-

\

SECTION I

GENERAL OESCRiPiiON AND SPECiFiCAiiONS

1.1

FUNCTIONAL DESCRIPTION

The DATUM NRZI Fonmatter provides for writing and reading IBM
or USASCII'compatible 9 track 800 BPI and/or 7 track 800/556/200 BPI
magnetic tapes.
The NRZI Fonnatter provldes.a simplified computer oriented interface to minimize the task of Interfacing to a digital computer. All major
operations are perfonned automatically under control of the Formatter.
Individual selection and operation wIth up to four "Daisy
Chalned" tape transports Is provided.
The transports can be a mixture of 7 and 9 track, any two tape
speeds, ReadlWrfte (single stack head) or Read-After-Write (dual stack
head) conf I guratlons.
Tape transport motion-control, CRCe and L~eC generation, and
checking, LRCC checking, Inter-record gap generatton and status reporting
are Included. All write clocks and delay times are derived f~ a crystal
controlled oscillator. No 1I0ne shots" or RC delays are utilIzed.
The NRZI Formatter Is provided wIth a selectton capability such
that two fonmatters (NRZI or 1600 ePI phase encoded) can be IIDaisy Chained ll
to one computer adaptor. This feature provides the capabilIty of mixing
9 track 1600 CPt phase encoded, 9 track 800 sp·t and 7 track 800/556/200
BPI tape units or providing up to eIght tape unIts vIa one computer adaptor.

1-1

Card space and excess +5V power is available for computer
adaptor -(may be wire-wrapped) in the Fonnatter.
"On the Fly" operation (continuous read or write at maximum
taDe
--r-

~DAed
-r---

without
... _._---

~toDnina
---rr"'~

in

...

p-~~h
n~nl
- - _ . . • in~~~_~~~n~d
•• _- • • _-_. ;1-,-'

i~
.
-

provided.
Writes the IBM compatible file mark (7 or 9 track formats)
and recognizes file marks.
Provides for the "Edit" feature (allows a record anywhere
on a previously recorded tape to be replaced with an updated
record) •
calibration or adjustment potentiometers in the Formatter.
All timing derived from crystal oscillator.

~

Compatible to enti re 1'2.5 to 75 ips tape speed range wi thout
even changing crystals. Single field changeable jumper selects the frequenci~s needed for the tape speed.
Special low threshold data recovery feature provided for.
Controls and indicator lamps are provided to allow:
1.
2.

3.
4.

Swftchable assignment of any tape unit number (0, 1,2
or 3) to any of the four tape units.
Lamp Indication of Formatter selection
Lamp indication of tape unit selection
Lamp indication of high or low density selection (7 track
tape units only)

S. Lamp indication of odd or even parity selection (7 track
tape units only)

6.

Remote or Manual control over density and parity selection

(7 track tape units only)
7. Power on/off.
1-2

i.2

PHYSiCAL DESCRiPiiON
The DATUM Model 5091 NRZI Fonmatter is designed to be mounted in

a standard 19" EtA rack.

The Formatter has 5.25" front panel height and

is 21" deep (allow 2" more for I/O cable service loop).

Top and bottom covers may be easily removed for access to integrated circuits.

Input/output cable connections are made at the rear of the
Fonmatter utilizing printed circuit edge connectors into which printed
circuit cable termination cards can be plugged.
Figure 1-1 illustrates the connectors for interfacing the NRZI
Formatter to an external or an internal computer adaptor and to the tape
units.

There is room for a third card to plug into the basic chassis to

allow for .the 1600 tPI Fonnatter which requires two card slots.

)..3

CONTROLS AND INDICATORS
The Front Panel controls and indicators are illustrated in

Ft gure 1-2.

1-3

TO TAPE
UNITS

TO EXTERNAL
ADAPTOR

POWER SUPPLY
CONNECTOR

r

- - - - - - - - --+-----

Fl

,
---.------,~.'----.---,.,-.-,-.-

' - FUSE HOLDER
TO COMPUTER
(IF INTERNAL
,ADAPTOR IS
USED)

Figure 1-1.

Rear View Formatter Connectors

-

JlIC CONNECTOR

PARITY INDICATOR
LAMPS

•

\J1

Qb

.0-,
o 12 3

DENSITY INDICATOR
LAMPS

MODE
MANW\L
r()~REMOTE
EVEN 0 1 2 3 FORMATTER
SELECTED 0 I 2 3

rO-,

[II

c:

I
B

PARITY
SELECT
SWITCH

IDIII
C

I

MODE
SELECT
S\~ITCH

UNIT
SELECT
SWITCHES

FORMATTER
SELECTED
INDICATOR
LAMP

Figure 1-2.

Front Panel

UNIT
SELECT
INDICATOR
LAMPS
DENSITY
SELECT
SWITCH

POWER

The power switch controls main power to the Formatter.

FORMATTER SELECT

Lamp indicates when the computer has selected the

2, 3) to be assigned to any physical tape unit (tape
unit A, S, C, or D). Only ~ tape unit should be
assigned to a particular unit number.
UNIT SELECT
INDICATOR LAMPS

Indicate which tape unit is selected.

MODE

Allows selection of densi ty and pari ty for 7 track
tape units to be under computer control (REMOTE) or
under operator switch selectabOle control (MANUAL).

DENSITY

When the Formatter is in MANUAL MODE, the DENSITY
switch controls the write/read density for 7 track tape
units. 7 track tape units can be any pair of densities
se1ected from 800/556/200 bits per inch. HI position
the lower density of the pair. The indicator lamps
give visual indication of the selected density whether
under REMOTE or MANUAL control. The lamps are dark for
9 track tape units.

PARITY

When the Fonnatter is in HANUAL MODE, the PARITY switch
controls the selection of ODD or EVEN character parity
for 7 track tape units. The indicator lamps indicate
the selected parity whether under REMOTE or MANUAL control. The lamps are dark for 9 track tape units.

i-6

1 .4

SPECIFICATIONS
Inter-record gap (7 track)
inter-record gap (9 track)
I'\! _ _ _ _ ! __ _

.75 inch nominal (.69 inch
minimum)
.6 inch nominal (.54 inch
minimum)
•• _ ! __ L......

Melgn~

u!me!1:::!un~

-

,.

fIIIII"

~.L~

! ___ L

__

Incnes

Width - 19 inches
Depth - 21 inches
25 pound maximum

Weight
Mounting
Power

Circuits
Operating Temperature
Storage Temperature
Altitude
Relative Humidity
Interface Voltages
(OTL 900 series or TTL
7400 series compatible)

Standard 19" EIA Rack
115 VAC ± 10%
230 VAC ±10%
160 watts maximum
48-400 Hz frequency
A11 s i 1 icon
OOto sooe
_40° to + 70°C

o

to 20,000 feet
10 to 95% (non-condensing)

low = OV ±.4V
high

= 3.9V

± 1.5V

The interface is designed such that an open circuit is interpreted as a Uhigh" signal.
Figure 1-3 illustrates the configuration for which the interface
has been designed.

1.5

MAGNETIC TAPE FORMATS

Figures 1~ and 1-5 illustrate the IBM and USASCI I magnetic
tape fonnats for 7 track and 9 track tapes respectively.

1-7

r------------,
CABLE

, r-- - - - - . - - ,
I
I·

t
I

·1 TERMINATION
I
I

I

CABLE RECEIVER
I
CABLE DR IVER
I
I
220n
I
I
I
I
I
I
D-------------------~~--------~
I
-....,,IL ________ ' IL ____________ JI
~

OTL 844 or TTL 7416, 7437,
7438, 7440 or equiva1ent

Figure 1-3.

OTL 8xx Series; TTL 74xx Series
or equivalent

Interface Circuits

1-8

FORWARD HOTION
(HEAD RELATIVE TO TAPE)
II I I I I I I

PC

I
I

11111111

2B

I I II 1'1 I

3A

48 I I
I I I I I
54 I I I 1 I I I 1
62 1 1 ' 1 1 1 1 1
7 1

REFERENCE EDGE

ro---'~----

I I I

I

~

BOT GAP
I NCH HI NIHU~l

.

I-LJ

I

14 CHARAC-

I
I

I
I

I

____I~ _ _ _

INTER-RECORD
DATA
~TER
GAP
... NEXT DATA RECORD
- - _ . pERiOor 0.75 INCH +. 1 5
- .0625
lRCC

I
\D

NOTES
1. TAPE SHOWN WITH OXIDE SIDE liP.
2. CHANNELS 2 THROUGH 7 CONTAIN DATA BITS IN DESCENDING ORDER OF SIGNIFICANCE.
3. CHANNEL P (PARITY) CONTAINS ODD DATA PARITY FOR BINARY TAPES, OR EVEN PARITY
FOR BCD TAPES.
4. EACH BIT OF THE lRCC IS SUCH THAT THE TOTAL NUHBER. OF I q l l BITS IN THAT TRACK
(I NClUD I NG THE lRCC) I S EVE~I. ITIS POSS I BlE I N THE 7- TRACK FORMAT FOR TH IS
CHARACTER TO BE ALL ZEROES, IN WHICH CASE A READ DATA STROBE WILL NOT BE
GENERATED.
5. A FilE HARK IS A SINGLE CHAnACTER RECORD HAVING ")II BITS IN CHANNELS 4, 5. 6
AND 7 FOR BOTH THE DATA CHAf~ACTER AND THE lRec. THE FI lE MARK IS SEPARATEO
BY NORMAL IRG's (.75 INCH) FROM THE PREVIOUS AND FOLLOWING RECORDS. OPTIONAllY, A 3.5 INCH GAP CAN BE ERASED PRIOR TO WRITING THE FilE MARK.
6. DATA PACKING DENSITY MAY BE 200, 556, or 800 BITS PER INCH.

Figure 1-4.

7-Track Format

- ........ FORWAI\D MOTION (HEAD RE LAT I VE TO TAPE)
CHANNEL 4

I I

6 I I

,

0

2
p
3

I I
I I

t I

t I

II

7
5 I I
REFERENCE
EDGE

I

ft.

I

I
J
I
I
,
'II
I

..
1.

I I
I I
I I
I I
( I

I
I
I
I'

I
I

I
I

,

I

I
I
I

I

I
I

I

~,--

14 5~~RA;I~ CHARAC-

~:'-:-H-G:-~-N-IM-t~"~"'.--,___D_A_T_A_~

p::~ 00

IIIIER-RECOrir-l.- NEXT DATA RECORD
GAP
o•6 INCH +. 15
-.10

-

CRCC

I

LRCC

o

NOTES
1. TAPE SHOWN WITH OXIDE SIDE UP.
2. CtiANNELS 0 THROUGH 7 CONTAIN DATA BITS IN DESCENDING ORDER OF SIGNIFICANCE.
3. CHANNEL P (PARITY) ALWAYS CONTAINS ODD DATA PARITY.
4. EACH BIT OF THE LRCC IS SUCH THAT THE TOTAL NUMBER OF "1" BITS IN THAT TRACK
(INCLUDING THE CRCC AND THE LRCC) IS EVEN. IN THE 9-TRACK FORMAT THE LRCC
WILL NEVER BE AN ALL-Z~ROES CHARACTER.
5. IT IS POSSIBLE FOR THIS CRCC CHARACTER TO BE ALL ZEROES, IN WHICH CASE A
READ DATA STROBE WILL NOT BE GENERATED.
6. A FILE MARK IS A SINGLE CHARAlCTER RECORD HAVING tll" BITS IN CHANNELS 3, 6,
AND 7 FOR BOTH THE DATA CHARA.CTER AND THE LRCC. THE CRCC CONTAINS ALL
ZEROES. THE FILE MARK IS SEPARATED BY' NORMAL IRGls (.6 INCH) FROM THE
PREVIOUS AND FOLLOWING RECOROS. OPTIONALLY, A 3.5 liNCH GAP CAN BE ERASED
PRIOR TO WRITING A FILE MARK.

Figure 1-5.

9-Track Format

1071

SECTION II
INTERFACE

2.1

INTRODUCTION

There are two interfaces to the Formatter, one to the computer
adaptor (~101 for external adaptor or J2 for internal adaptor) and one
to the tape units(J102). (See Figure 1-1, page 1-4.)
If the internal adaptor is utilized, then connector Jl03 is
available to interface the adaptor to the computer. Datum printed circuit
board #170189 is avai lable for constructing the adaptor internally. The
P. C. Board can accept up to 196 14 or 16 pin wire wrap sockets.
The interface connectors are 100 pin Amp 583485-3 printed circuit edge connectors which mate to DATUM part number 170192 cable tenminato~

printed circuit plug-in board •

. Indivi dual stranded twisted pai r wi res shoul d be used of 22 to
26 AWG. Maximum length should be 61 for the computer adaptor interface
and 20· (total) for the tape uni t I'Daisy Chain" bus.
The twisted pair wire should have at least one twist per inch
and minimum insu1ation thickness of .01 inch.
The ground wIre of each twisted pair should be terminated to
ground as close to the origin or destinatIon oT the signal as possible
(within 6 Inches maximum) to minimize ground loop currents "crosstalk"
e.ffects.
The interfaces are listed in Tables 2-1 and 2-2. The terms
wi th a !ibar" over them are 'Ilow" (OV) when active and the terms wi thout
a bar are "high" (+5V) when active.

""

,

FOR~4TTER/TRANSPORT(S)

2.2

INTERFACE

Table 2-1 lists the signals and the pins on which the signa1s
appear.
Table 2-1.
..

----.

Formatter/Transport(s) Interface
_

..

_--_.

Formatter 12 Transport
SLCTA

58
54

.,1.
;;rr

-1

I
l

Transport
Address

64
66
62
70
57
41

(

FPT

LOP

44

8

OW

76
78
80
72
74

94

RiliT

24

RoP

92

RTH2
WARS

14

RoO

32

R01

DDs

18

'Ro2

45

WOS

20
28

RD3
RD4

48

WOo

50
51

_ WOl

49
52
37
38

WD3
wo4

36
S5

43
46

42
40

Control

Write Data
-,- NotStrobe
Used for
: .... 7 Track NRZ I

W02

30
10

12
Write Data

6

-r

ROY
ONL
RWO

SFC
SRC
RWC
OFC
SWS

56

f

SLCTB
SLCTC
SLCTD

I, J~.02In !--;ransport -to ~~nn~tter

Status

C'nT

""VI

NRZ/PE TRANSPORT
SINGLE/DUAL HEAD
L~/HIGH SPEED
7 TRK/9 TRK
001

~

Read Data

-RD5

R06
R07
ROS (1)

Read Strobe

WD5

wo6
W07
WOP
Total = 24
Formatter
On 1y
Notes: (l)NRZI
-----_
..
... - .- - --- .

__

Total = 21
- ... -

_.

---

-.----

-_.-

.//
/'

.,

.,

1

,.,. I

Fonnatter to Transport

2.2.1.1

Transport Address

SLCTO through SLCT3 - Transport Seiect Lines. Four seiect
lines gated with the Fonmatter Address signal to select one of the
Deyeloped by

address lines from the computer adaptor.
2.2.1.2

Control

The control lines activate the selected transport when it is
IIREADYIt and liON LINE".
SFC - Synchronous Forward Command. A level which, when low.
causes the selected transport to "ramp" up to speed and drive forward
at the rated speed until the level goes back high. When switched to the
high level, the transport "rampsll down to halt.
SRC - Synchronous_Reverse Command. A level which, when low,
causes the same action as SFC except in reverse tape motion.
RWC - Rewind COOI'Iland. A negative going pulse which causes the
selected transport to rewind to load point.

OFt - Offline Command. A negative going pulse which causes
the selected transport to revert to manual control. Transport must be
manually placed liON LINE" before it can again be operated.
The off1 ine conwnand £!!! be transmitted to a tape transport that
is rewinding (even though the transport status indicates NOT READY).

SWS -

Set Write Status. The level of this signal is inspected
within 20 microseconds after a SFC or SRC command is initiated to set the

2 .. 3

selected transport to the write or read mode. This mode is maintained
until the next SFC or SRC command is initiated.
The write mode within the transport is also switched to read
mode if:

a)
b)

c)

A RWC or OFC command is received.
Loss of interiock occurs.
The transport is manually switched offline.

OVW - Over Write. This signal is a level which causes the
transport write current enable/disable to "ramp" on and off to minimize
rate of change of recorded inter block gap magnetism when rewriting
a record in the EDIT mode.
This signal level aiso causes the write current and DC erase

head current to be turned offinrnediately after rewriting the new record
(to keep f~ erasing the beginning of the next record).
RTHI - Read Threshold 1. This level selects a high threshold
for marginal checking of written records when utilizing a single stack
head. This is usually accomplished by backspacing over a newly written
record and then reading forward in the high threshold mode to perfonm a
parity check.
I

Riii2 -

Read Threshold 2. This level selects an extra low
threshold for recovery of very low quality signals (on transports so
equipped).

WARS - Write Amplifiers Reset. This signal controls the early
turn off of write and erase currents after rewriting a-record in the EDIT
mode.

The negative going transition of this signal initiates the
write current turn off. In NRZI transports, this signal also generates the
lRC character.

2-4

DOS - Select high density.

Low

= select

high density (for NRZI

Formatter only) for 7 track transport.
2.2.i.3

Write Data

WDS - Write

Data Strobe.

This is a clock utilized to copy the

write data (WOp and WOO through W07) in to the se1ected transport write
flip-flops. The data levels must be static during WOS and the trailing
edge (positive going) of WDS is used to clock the fl ip-flops. The clock
rate is twice the character rate for 1600 CPI and at the character rate
for NRZI.

WOP,

WOO

WOO through W07 - Write data. WOP is the odd parity bit,
is the most significant bit, and W07 is the least significant bit.

WOO and WO] are not used for 7 track NRZI operation.
These signals are presented to the se1ected transport along
with the

WDS

clock.

For the 1600 CPI Formatter, the first negative going

transition (in writing a record) is the "zero bit" of the preamble.
write data is presented in phase encoded fonn.

The

For the NRZI Formatter,

the write data is presented in Jogic level form (low = 10gic I, high =
logic

0).

2.2.2

Transport to Formatter

2.2.2.1

Status lines.

ROY

=

a)

Interlocked.

b)
c)

Through the inStial load or rewind to load point sequence.
On line.

d)

Not rewinding.

Ready.

A level that is low only when the selected trans-

port is:

Note: A transport will go NOT Ready for approximately .S second
after reversing into load point and does not go Ready until approximately

.5 second after tenmination of a Rewind.
2-5

ONL - On line. A ievei that is iow when the selected transport is manually switched on line (to place it under remote control).
RWD - Rewinding. A level which is low while the selected
transport is rewinding. ihe ievei remains iow untii the transport
completes the automatic "return to load point" sequence but the transport
does not become

tenninates.
FPT - File Protect. A level which is low when the selected
transport has a supply reel of tape mounted which does not have a write
enable ring installed.

LOP -

Load Point. A level which is low when the selected transportis beginning of tape reflector is located under the photo sensor;
interlocks are made, and the initial load or rewind sequence is completed.
EDT - End of Tape. A level which is low when the end of tape
reflector is under the photo sensor in the selected transport. This
signal is not staticised and neither the positive or negative going
transition is IIclean".
NRZ/PE - Non Return to Zero/Phase Encoded. A level ~ich
reports the selected transport type. Low for NRZ type, High for PE type.
SINGLE/DUAL - Head Stack. A level which reports the selected
transport head type. low for single stack, High for dual stack "read
wh i1 e wr I t i ng" .
Low/High - Transport Speed.
transport tape motion spee~.

= low speed
High = high speed

low

2-6

A level which reports the selected

7 TRK/9 TRK - Transport Type.
Low = 7 track
High = 9 track
DOl - Data Density Indicator
Low = High Density Selected
High = Low Density Selected
2.2.2.2

Read Data & Read Clock
RDP, ROO through RD7 - Read Data.
a)

1600 CPt Fonmatter:

Read Data from the selected transport is identica1 to the
Write data wave fonns supplied to the transport. There is
no read strobe.
The Phase Encoded signals are high during an Inter Block Gap

or when the tape is not in motion. In the forward direction
the first negative going transition is the zero bit of a
preamble. In the reverse direction the first negative going
hence the zero bit transition will be a positive going
transition in read reverse.
b)

NRZ'· Fonnatter:
Read Data is in logic level fonm (low = logic li high =
logic 0) and is presented along with a negative going read
strobe (ROS).

2.3

FORMATTER/COMPUTER ADAPTOR INTERFACE

2.3. 1

General

Table 2-2 lists the signals and pins for the Fonmatter/computer
adaptor interface.

2-7

All signals from the Fonmatter ~ the Computer Adaptor may be
IIdaisy chained ll to a second Formatter such that one of the two Formatters
may be addressed to operate with the Computer Adaptor. in order to accomplish this~ all such signals are "low active" open collector cable driver
integrated circuits capable of sinking 25 mae This allows all such signals
to be'tenminated with resistors to +5V at the Computer Adaptor.
2.3.2

Formatter to Computer Adaptor

2.3.2.1

Status

Most of the status signals are generated by latch fl ip-flops
that retain the occurrence of the status until the next command is
accepted by the Fonnatter (or the Formatter is deselected).
Some of the status signals are levels from the Fonmatter or
f~ the selected transport that are gated with the Formatter address line
hence are ~ reset by the COITI11and c1ock. These status signal s are marked
by note 1 in Table 2.
EaTS - End of Tape Staticised. When low, the EOTS level indicates seiected tape transport is on or has passed ovei (in the for~ard
direction) the EOT reflective tab. The E"OT'S signal remains low until a
IIreverse direction" comnand (such as rewind, backspace or read reverse)
Is accepted by the Fonnatter. Thus the program only need check for EOT after
completion of writing each record.

EaTS

is also reset by power on, or the EXT RESET signal from the
Computer Adaptor.
REJECT - Rejected Command Status. Goes low when the command
accompanying the command clock (STROBEC) is rejected by the Formatter.

2-8

Table 2-2.
Fonnatter to

Fonmatter/ComP4ter Adaptor Interface

I -

EOTS

I

I I,
;

22
20
87

~2} ~u;RK

. . n_..

1)
1)

...

•

~

5

.§.!!iG L E
LOW

TMER

92
Status

PARITY ER

93
70
95
9
43
I. 47
31
. 38

I

I li

REJECT

~

1)
1)
1)

I

It1I

I~
-,
Lt

40

go

32
55
57
89
58

f]L
ROY
RWOG

IU

-r

Computer Adaptor to Formatter

Compute~Adaptor

ill
bQf.

wec

64
68
,-,

m

IDENTS
CERS

VI

.J

66
77
6
8
85

l

19

15
26

17

1

Read Data
&. Clock

25
11

63

75

2.9

30

1328

J

rAUl

I

I

~i

Addressing

i:

Command
Clock

STROBEC
EXT
SET
SET
S.ET
SET
SET
SET
SET
SET

RJCT
REV

wce

WfH
GAP
FSR
ReC
CLR
REW

C::CT
nC"t
.., . . . .
Vi ...

Commands

I

--i

3) GEN 000 PAR1iYl
3) HI D~NSITY
I

I

THRl

gl:

'SPACE

J'

Modes

3) CD

.~..,

94
65

CBUSY
DBY
RCAS

78

;)1

l'

RSTROBE

21

62.
39
42
45

Wri te Data

52

82

46

69

WRHSB

6)

76
79

RJEf

Reject Pulse

CK WD CNT

7)

34

C.LK

Clock

72

88 .

WRP

Write Clock
Precede

67

~

Total

49
7

= 36

Ah~ays

1 when 1600 Fonuatter Is

addressed.
3) Not used by 1600

FOI~atter_

W/R ACK Data rransfe1
Acknowledge.
Control
HALT
Last Word
_ _ _...
Transferred
EXT RESET

.J

Total

1) Status levels not reset by acceptance
of new command.
2)

---,

~

= 33

4) Always 0 (open circuit) from
Fonnatter.
5) D~ta Transfer Flag_
6) Write Mrost Signlfici'nt Byte.
7) Check Word Count Pulse.

~RZI

The reject status is needed to keep the computer program from
"hanging up" when it issues a command that the Formatter can't perform.
NOMmal1v
..
- .... _. -, th~
- .. - ~omnuter
--·--r---- adantor
---r---

is
--

d~5ian~d
----oJ----

to
--

int~rruot
------ - - r -

th~
nroaram
---- r-oJ- ----

when
-------

the commanded function tenninates (based on the Formatter returning to the
NOT busy state).

If the Fonmatter canSt perfonn the commanded function,

the RJCT pulse can be utilized to set the interrupt. When interrupted, the
REJECT status line can be inspected by the program (before going on to the
next function) to ascertain if the command was accepted.
The following conditions cause a reject:
a)
b)
c)
d)

Fonmatter busy with transport motion or se1ected transport
busy and any command other than a clear is issued.
Reverse motion command issued while at BOT.
Write command issued while no write ring is installed on
selected transport.
Any "external rejectl l condition exists in the computer
adaptor (a typical use is detection of a non-valid command
code).

9 TRK - Nine Track Tape Transport Selected.

Available only if

tapeuntt is equipped to supply this status.
Low = 9 track transport is selected.
High

=7

track transport is selected.

NRZ - Non Return to Zero Tape Transport Selected.

Available

only if tape unit is equipped to supply this status.
low = NRZI transport selected.
High = 1600 PE transport seJeeted.
SINGLE - Single Gap Head Transport Selected. Available only
if tape unit is equipped" to supply this status.
Low = Single Gap Head (Read/Write).
High = Dual Gap Head (Read while writing).
2-10

LOW - Low Speed Tape Unit Selected.
is equipped to supply this status.

Available only if tape unit

nw. , -r-----C:n~~rf
-_.. = I...-.

I nw

High

= High

Speed.

TMER - Data Transfer Timing Error Status.
Low = Error.
Hi gh = No Error.
Level that indicates detection of computer adaptor failure to
transfer a character before the next character transfer is required. This
check is perfo nned both in wr i te and read modes.
Parity ER - Parity Error Status.
Low = Error
Level that indicates error condition wa$ detected on last operation.
a)

1600 CPI Formatter:
1. Correctable error occurred (CERS will be low also).
2. Uncorrectab 1e error occurred (CERS wi 11· be high).
3. False preamble or postamble was detected.
4. Skew error.
5~
Multi track dropout.

For an error condition consisting of a vertical parity error
without a corresponding single track dropout the PARITY/ER 1ine wi 11 be
pulsed low during Read Clock (RSTROBE) time to tag the character in question.
b)

NRZI Fonnatter:
1. LRC error occurred.
2. VRC error occurred.

FM - File Hark
Low
High

Status.

= File mark detected.
= No file mark detected.
2-11

ROY - Ready Status.
Low = Selected transport is ready.
High = Selected transport is not ready.

RWDG - Rewinding Status.
Low = The selected transport is rewinding or is not
ready yet after a rewind.
High = The selected transport is not rewinding.
The RWDG status flip-flop doesn1t indicate tenmination of
rewind until the transport also indicates READY (if a single transport
is commanded to rewind and the Fonmatter waits until the rewind terminates).
In mUltiple transport sy·stems it is possible to initiate rewind on one
transport, select and operate another transport, and then re-select the
first transport and find that it is not reporting the rewinding condition,
yet isn1t ready (because it stays not ready for approximately .5 second
after tenmination of rewind). For this reason, the computer program
should always check for ready status as well as "done rewinding" before
proceeding after any rewind on mUltiple tape systems.
FPT - File Protect Status.
Low' =

Selected transport is protected against writing
(no write ring installed on supply reel).

m

LOP - Load Point. (see
under section 2.2.2.1)
Low = Selected transport is at BOT.
High = Not at BOT.

wee - Write

Mode.

Level that indicates when the Formatter is

writing a record.
Low = Writ' ng.
High = Not writing.
Typically used with "unpack" signal WRHSB to control the computer
data requests and computer adaptor to Fonnatter write strobes (W/R ACK) when
unpacking a computer word into two tape characters.
2-12

RCC - Read Mode. Level that indicates the Formatter is
perfonning a read operation.
Low

~~~rlinn

. , - - - ••• ::;r

High = Not reading
Typically used to indicate IIdata transfer direction!! to the
computer and to disable detection of read mode record length error logic
(on the computer adaptor) when ~ reading. Also disabJes the read mode
control of the computer adaptor data transfer control logic even though
read strobes are received for "read while writell operations.
IDENTS - 1600 CPt Identification Status.
Low = 1600 CPt tape identified at BOT.
Signals detection of 1600 CPI IIBurst li when selected tape is
commanded to move off BOT. (1600 CPI Formatter only)
CERS - Corrected Error Status.
Low = Single track error was corrected by the 1600
Formatter in the last record. Always logic 0
(open ci rcui t) from NRZ I Fonnatter.
2.3.2.2

Read Data & Clock

The read data is completely "buffered ll in a special register
(supplied on the Fonmatter) such that no external register in the computer
adaptor is required. The data is allowed to change just before the leading
edge of the read strobe pulse (RSTROBE) and is static throughout RSTROBE
and until the leading edge of the next RSTROBE pulse.
The RSTROBE pulse actually isn1t needed for simple 8 bit single
character interfaces to computers but is included to allow more sophisticated c:ompu"ter adaptors to be built which "pack" successive pairs of tape
character into a 16 bit word for computer entry. In this case, at least
8 bits must be stored on the computer adaptor.

2-13

The DATA FLAG Control signal goes low at the trailing edge of
the RSTROBE pulse to signal that read data is ready for output from the
Fonnatter. The computer adaptor must respond with W/R ACK before the
next RSTROBE puise occurs or. the data transfer timing error (TMER) will
latch.
RSTROBE - Read Strobe Clock. Negative going pulse that can be
utilized to clock the levels present on the data lines into an external
register. No~11y also used by the computer adaptor to detect read
record lengths that are longer than expected by gating with a signal that
indicates all the characters asked for by the computer program have been
input. If more RSTROBE' s occur, after this signal indicates that the
record length asked for has been input, then the record is longer than
expected.
2.2.2.3

Control
CBUSY - Controller Busy.

Low = Controller busy.
High = Control1ei not busy.
Goes Tow at the leading edge of the STROBEC cOnlTland clock when
a new command is accepted and remains low until the. operation has finished
and all tape motion has ceased.
The offline command does ~ cause the controller to go to the
busy state and the rewind command can be jumper selected to not cause the
controller to. go to the busy state.
The computer adaptor nonnally makes use of CBUSY to inhibit new
commands. However, for continuing with writing or reading "on-the-flyt',
the computer adaptor logic can ignore the CBUSY level and initiate the
next command when the DBY (data busy) signal tenminates at the beginning
of the IRG (inter-record gap).

2-14

DBY - Data Busy
Low = Data write or read portion of operation is in
process.
The DSY does not occur for offline, rewind, Or clear & seiect
type cormnands.
The

i5BV signal begins after the initial IIUp to Speedlldelay

transpires and remains low until the motion command 1 ine (SFC or SRC)
to the selected transport is tenninated. At this time the transport
begins. deceleration to stop in the inter-record gap.

If continuous "on-

the-fly" operation is desired (to halve the amount of time required to
traverse the IRG) then the computer adaptor can initiate the next command
immediately after OBY terminates rather than waiting until CBUSY terminates.
The only restrictions are that the next command must be the same type and
direction as the preceding command.
The computer adaptor is usually designed to notify the computer
program when D'BV tenninates and it is left up to the computer program to
read status (to determine if the last command tenminated correctly, check
that the new command is of the same type and direction as the old, and
Issue the new conwnand).

Comnands are "typed" as to whether they are read or wri te
ccmnands as fo 11 ONS:
Comnand Types
Read

Write

Space Forward
Space Reverse
Read Record Forward
Read Record Reverse
Test Read Forward

2-T5

Erase 3" Gap
Write F i 1e Ha rk

Wri te I Record

RCAS - Read Clock Activity Sensor. Used In NRZI Fonnatter to
separate the CRC/LRC characters from the data character in a read forward
operation. In NRZI Formatter, low = data portion of record. In read
the data hence the program must expect one or two more characters to be
input than In the read forward mode and must dIscard the CRC/LRC characters.
This may be done for the 9 track case by setting the record length to two
characters more than in the forward mode. Since the CRCC may be all zero,
program would have to test the record length error status to find out
whether to discard: 1. The first character only (LRCC) if record is too
short. 2. The fIrst two characters (LRCC & CRCC) when the record is the
expected two characters longer than In the forward mode. In the 7 track
case the record length must be set to one extra character (only LRCC is
generated for 7 track) and the record length error status Inspected to
detennlne whether to discard the first character or not. If the record is
the expected one character longer, the first character (LRCC) must be discarded. If the record indicates that It is too short, then the LRC character must have been zero hence the first character is data and should be
aetai ned ..
For 1600 CPI Fonmatter, the RCAS Signal is switched low throughout each data record in both the forward and reverse read operations.
DATA FLAG - Data Transfer Request Flag.
Low = transfer request active.
The data flag is utl1 ized for .22!h write end read functions.
It is cleared by the leading edge of the W/R ACK pulse from the computer
adaptor.
In the case of wrIting. the data flag is set one character time
before the character is needed hence the amount of time allowed before the

W/R ACK pulse must

be received Is dependent solely upon the tape speed.

If the W/R ACK pulse Is not recleved In. tIme, the

2-16

Ti1'E'R

{data transfer error}

In the case of ieading, the data flag is set at the traiiing
edge of the read strobe (RSTROBE) pulse. Due to tape speed variations
and bit crowding effects,_ the worst case time allowed may be as short as
one-half the character time but is also directly dependent upon the tape
before the next RSiROBE is
generated then the TMER latch is set.
WRMSB - Write Most Significant Byte.
Low = Odd characters
Hi gh = Even cha racters
Flip-flop that toggles to the opposite state for each character
to be written on tape to allow 16 bit computer words to be easily "unpacked ll
into two 8 bit tape characters by the computer adaptor.
Not needed for simple 8 bit transfer modes of
WRMSB is switched shortly before

DATA

operation~

FLAG is set and is static

throughout DATA FLAG time hence can be gated with

DATA

FLAG to determine

whether to set the computer data request flag or to generate the W/R ACK
signal back to the Fonnatter when Ilunpackingll.

'iOCf -.Reject Pulse. Negative going pulse which sets the REJECT
status flip-flop.
This pulse can be utilized by the computer adaptor to trigger
the interrupt nonmal1y set by the DBY or CBUSY tenmination.
The computer program should always check status after a command
operation signals completion to detenmine if the command was accepted
& perfonmed correctly or if the command was rejected.
CK WD CNT - Check Word Count Pulse. Negative going pulse at
the end of each record which is usually used by the computer adaptor to

2-17

set a "record length error l status

"""

..... ,

'" : 40

:

.4!

record read is shorter

than expected.
Usually gated with signal in computer adaptor that signifies
campti te i p rog ia.ii

1.. ...... ,.
IIQo:I

........... ..-._
...,~~ ••

t __ •• _
"'I-'UI..

If this signal isn't set when CK WO CNT pulse occurs then the record must

ClK - Clock.

Clock derived from crystal oscillator on formatter.

WRP - Write Pulse Precede. Pulse that precedes write flag (DATA
FLAG) which may be utilized to test for data transfer complete before the
next one is initiated.

2.3.3

Computer Adaptor to Formatter
General

The computer adaptor driver circuits to the Formatter should be
capabJ'e of sinking 30 milliamps when at the low level. They need not suppJy any current when at the high level since resistor termination's to +5V
are supp1ied within the Formatter. The drivers are not reguired to be
"open. collector" types however (since no "wi red or" function is uti 1 ized).

2.3.3.1

Addressing

FAD 1 - Fonnatter Address
Low = Fonmatter #1 addressed.
High = Fonnatter #S addressed.'
This level must remain static throughout execution of any command.
The Fonnatters have capability of jumper specifying whether their address
is " or 1.

2-18

51, 52 - Transport Select Address Lines.

These leve1s are
decoded by the Formatter to se1ect one of the four transports. The levels
must remain static throughout any operations except Rewind. A transport
can be commanded to rewind and a different transport selected immediately.
51

52

Tape Unit Selected

Low
High

Low

0

Low

1

Low

High
High

2

High

2.3.3.2

3

Commands & Command Clock
Generai

The commands are stored in the Formatter by the command clock
pulse if the COfm1and is not "rejected" by the Formatter.
CBUSY is set at the trailing edge of the command if the command
is accepted. When the CBUSY signal terminates, the operation has been
completed by the Fonmatter and the Fonmatter is ready to accept another
comnand.
Commands - The offline command never causes CBU5Y to set and
·CBU5Y set upon rewind command acceptance is jumper selectable.
The command signals must be static from 100 nanoseconds before
the leading edge to 100 nanoseconds after the trail ing edge of the command
clock.
Table 2-3. illustrates the valid Formatter functions and the
corresponding command lines that are required to be "highll in order to

2-i9

initiate the associated function. All other cormtand lines must be "lowll
with the exception of EXT RJCT which over-rides a1l other commands.
Command Clock. The command ciock (STROBECj must be a positive
going pulse of 100 nanoseconds {or more} pulse width.
Table 2-3.

Commands

Fonnatter Function

COI1I11and Signals "Highll

1) Wri te Fi Ie Mark

Erase 3" Gap then Write File Mark
1) Write Record
Erase 3" Gap then Wri te Record
2) 3) Space Forward
1) 2) 3) Space Reverse
3) 4) Read Forward
3) 'Read Reverse
Erase 311 Gap
Reject
Clear
Rewind
Offline

5)

SET
SET
SET
SET
SET
SET
SET
SET
SET
EXT
SET
SET
SET

WFM
WFM/SET GAP
WCC
Wee/SET GAP
FSR
REV
RCC
RCC/SET REV
GAP
RJCT
CLR
REW

OFL

5) overrides all other commands.
4) can be in either nonmal or test read mode.
3) can be read in various read threshold modes.

NOTES:

2) can be mUltiple record spacing under control of STOP SPACE mode.
1) can be in edit or nonmal modes.

2.3.3.3

Modes

The mode lines are levels which are not stored in the Fonmatter
by the command clock hence must be stored by the computer adaptor. They
2-20

must all remain static (with the exception of STOP SPACE) throughout execution of a command by the Formatter.

the

1600

SEN ODD PAR!TY = Generate Odd Parity. This line is ignored by
CPI Formatter. The NRZI Fonmatter uses it to control parity

generation for 7 track tapes (if in the REMOTE parity control mode).
Low

= even

parity, hlgh

= odd

parity.

HI DENSITY - Select High Density Write Mode. The 1600 CPI
Formatter ignores this line. The NRZI Formatter utilizes the line to
control High/Low write density selection for 7 track tape transports (if
in the REMOTE density select mode) high

= low

density, low

= high density.

THRl - Select Read Threshold One. Used for single track head
transports to enable a marginal read amplitude check to be made immediately
after writing each record (by backspacing then reading forward) to determine
whether that section of tape should be erased and the record re-written
further down the tape.
Low = Marginal threshold (high threshold).
High

= Normal

threshold.

THR2 - Select Read Threshold Two •. Used for transports equipped
with the extra low read threshold capability for reccverf of low amplitude
data.
Low

= Extra low threshold.

High

= Nonnal

threshold.

EDTf - Edit Mode. Enables records to be replaced with equal
length records anywhere on a tape.

= Edit mode.
High = Nonna 1 mode.
Low

The record to be replaced must first be backspaced over in the
edit mode (to position the write head correctly) then rewrltten in the
edit mode (to cause the erase head and write current to be turned off
2-21

immediately at the end of the record before the erase head erases into the
following record).
TRD - Test Read Mode.
Low = Norma 1 mode.
High = Test read mode.
Not used by 1600 CPI Formatter. The NRZI Formatter utilizes
the line to control access to the CRC/LRC characters (when reading forward)
for diagnostic and maintenance purposes. In test read mode, the data flag
Is allowed to trIgger for the CRC/LRC characters.
STOP SPACE - Stop Forward or Backspacing.
High = Nonnal (Formatter spaces 1 record for each
conmand).
Low = Cont I nuous spac t ng •
The RCAS signal can be used by the computer adaptor to count the
number of records spaced over to determine when to switch STOP SPACE high
to terminate multiple record spacing. The leading edge of RCAS should be
used to count records and switch STOP SPACE high upon detection of the
last record to be spaced over.
CD - Core" Dump Mode.
LoW = Core dunp mode.
High = Normal mode.
Ignored by 1600 CPI Formatters. The NRZI Formatter utilizes
this line to operate 9 track tape machines in a 7 track mode where in 7
track type ftle marks are written and detected. This mode is necessary
for compatibIlity with some computer systems In the fIeld.
2.3.3.4

Write Data

The write data consists of eight lines which must be stable
during the W/R ACK pulse transmitted from the computer adaptor to the
Formatter. Odd parity Is generated in the Formatter for recording.

2-22

A write data storage register is inc1uded in the Fonnatter so
that none is required in the computer adaptor.

so through B7 are the write data 1 ines. SO is the most significant bit.

2.3.3.5

(low

= logic

I! high

= logic

0).

Control

W/R ACK - Write/Read Acknowledge. This negative going pulse
is used to acknowledge the DATA FLAG request for data transfer in both
read and wri"te operations. The pulse must be at least 100 nanoseconds
wide.
In the write operation the W/R ACK pulse is used to clock the
levels present on the SO through i7 lines into the Formatter write storage
register and to reset the DATA FLAG flip-flop.
In the read operation the W/R ACK pulse is merely used to
reset the DATA FLAG flip-flop.
The leading edge of the W/R ACK signal is delayed in the
Formatter and utilized to reset the DATA FLAG flip-flop such that the
Formatter DATA FLAG signai can itself be gated at alternate character
times onto the W/R ACK line to reset itself (in "Pack/Unpack" modes of
operation). This is useful since actual data transfers with the computer
must take place only for every other tape character time yet the Fonmatter
data transfer requests must be serviced for every 8 bit tape character
(since it only provides sto'rage for one 8 bi t tape character).
Halt - Halt data transfer.
The sIgnal is used to initiate tenmination of writing a record
or to terminate data transfer requests {DATA FLAG} fnom the Formatter when

2-23

ieading a record.

The signai is normaiiy iow and shouid go high after the

l!!! W/RACK

pulse to signal tenmination of the record.
until the next command is issued.

Must remain high

in the write operaclon$ the i600 CP! postamble (or the NRZI
CRC/LRC character) are written and a portion of the inter-record gap is
erased before the tape transport begins to decelerate to halt in the iRG.
In the read operation, the Fonnatter continues on until the true
end-of-record is detected before initiating the halt in IRG process.

EXT RESET - External Reset. The external reset line allows the
Fonmatter to be c1eared to initial conditions from such signais as the
computer "start ll button etc.
Low = Reset
High = Normal

2-24

Hodel 5091

SECTION III
THEORY OF OPERATION

3. 1

INTRODUCTION
. This section contains )nformation on the operation of the

Model 5091 NRZI Magnetic Tape Formatter.
The information in this section is divided into two major
topics. A discussion of the block diagram (Figure 3-1) is presented
first, to provide an overail functional description and to illustrate
the relationship between the Fonmatter, the tape transports, and the
computer adaptor. A discussion of the command execution, illustrated
by timing diagrams, describes operation of the ·Formatter circuitry
during execution of oomputer-originated instructions.
The Fonmatter performs three basic functions.
1•

2.
~

~

.

These are:

Control
Write
Read

The Formatter provides control over the selected tape unit
including all timing necessary to automatically perform all write, read,
rewind, space forward or backward, and rewind commands.
Upon completion of the commanded operation, status is provided so that the computer can ascertain whether the operation was performed correctly.
The Formatter performs all the write functions for erasing
tape, writing a file mark or writing a reeord of data. A 3.5 inch gap

3-1

NRZ I 719 TMCK
TAPE TRANSPORT
TAPE
TAPI
UNIT
UNIT
~GNlTIC

D

IA

--_.-._---------UNIT SELECT

NRII fORHATTER

...

SletA

Sictl
SletC
51etD

ADD...

I Sfe

COHHANOS

':::

=v

, OFFC
STATES

~

TAn

COU.HTER

AND HAIN
CONTROL

-

-G~~' ® ~-

~
@) -

----

SPEED CLOCK
STOP
STATUS

VALID CLOCK
STRIDaE C

-.~

IE

DATA
COHPUTER

liAD
DATA

I
I
I

DOD .A1m..
STATES

I~.:!:t. ®l:=

-CONTRO~
7 TN<

RITY

,_ _ _aG.II

le-,
®F.

RIlE STORAGE
REGISTER

r

r:::=====::-=7=T=RK==

~
r----J"--?
(w
TOP

SET

----.._-'

~~~R

S

-r--'"'-----__

DATA FLAG
W/R ACk
HALT __----,L--_ _ _---:=__--

CRYSTAL OSC (s)

'--1I--~~&--I ANOTAPE

......- - - - 1

READ

ODD
PARITY

PARITY
GEN

7 TRK

~rER-RECORD

STROBES~~

DETECT

WRI

SElECT

"""--1

CLOCKL-":==:=~---'~
--,.

GATE CONTROL

RESET
DELAY

14

SPEED SELECT

LEDGE

---.!
WRITE CONTROL

LOGIC

STATES
COHHAND

REGISTER

7 TRK

CWNTER
CIC CLOCK

HALT

IJRITE CLOCK

__

L_~==~=====

nun

WRITE AttPS OO~C.n

!iET WRITE STATUS

--

'" ------.------~------'~~----T_--.~_T----+-

Jl01 -65
JIO 1-65_
-65
-65
-65
-65

3.66
12.0
3.66
3.66
53.6
5.66

.-

~-

......

-

_.

12.0
3.661
3.66
53.6'
5.66

--........,.~---.-....-

--,-,,.---

-

.....

S3 (1)
S3 (1)
S3 (1)
(1)
- S3
S3 (1)

53(1)
S3 (1)
S3 (I)
S3 (1)
53 (1)
53 (1)

1'0

---

Cathode CR4 DBV (1)
Cathode CR4 DBY (1)
--Cathode CR4 DBY (1)
.--.
Cathode CR4 DBY (1)
,,---CathodeCR4 DBY (1)
Cathode CR41 DBY (1)

Jl01-6S
---J101-65

---~

_.-

DBY (1)

NOTES

3.
2.
1.

TO

.-

JI01-65 CBUSY(1) Jl01-94

Jl01-65
JI01-65
Jl01-65
Jl01-65

--_.

1.67
1.67

...... ---~---- ...

o

',33
2.66
2.66

,-~---,--

- - - ,-_._----

.-.-----~---

Cathode
Cathode
Cathode
Cathode
Cathode
Cathode

HALTDELAY
FROM

Time
Interval
Milliseconds

5.66

(transition) = a mE!ans from +5V to OV, =1 means from OV to +5V
Write
~ Write 1 record or write file mark
= Read 1 record or space
Read

CR4,
o
CR4 ......DBY(I)
Jl01-65..
_-----_
I. 67
CR4.. DB Y ( I) J 10 J- 65
...
........
CR4 "DiY (1)....:!!.2.1- 65 __ 2:_3_3_ - I
CR4 DBY(I) Jl01-65
.33
CR4, DBY(l) JI01-65
- ,33·

-------

'

'

~

---~

~.

~----.-

_ . . . . . . . . . ...-.. ,_. . . . _-w_

Table 3-10.

NINE TRACK PRE/POST DELAYS (45 Ips)
I

PREDELAY
TO

FROM
Signal
Read forward
Read forward (BOT)
-Read Reverse
.1 "91 e
itack Read Reverse (EDI T)
-tead
Gap or Write (BOT)
Write

-

*

Read forward
)ua 1

itack
-tead

5TROBEC(O) JIOl-5
m(l)
Jl01-47
STROBEC(O) Jl01-5
STROBEC(O) J101-5
1'---LDP(1 )
Jl01-47
STROBEC(O) Jl01-5

-

LDP(1)
5TROBEC(O)
STROBEC(O)
LDP(l)
5TROBEC(0)

DBY(O)
DBY(O)
DBV(lO)

J1Ol-4j DBV (10)
Jl01-5 DBY (10)
JI01-5 DBy(b)
Jl~47 DBY (10)
Jl01-5 DBV (.a)

-.-,-.--~

DBY (1)

3.
2.

NOTES

I.

-~-

..

53(1)
S3 (1)
S3 (I)
53 (1)
.. 53 (I)

Cathode
Cathode
Cathode
Cathode
Cathode
53(1) Cathode

.TO

Jl01-6S CBUSV(l) J101-94

(trans I tl on)
Write
Read

FROM

9.4

mei:ins from +5V to OV, = I means from OV to +5V
~ Write 1 record or write file mark
= Read I record or space

= Q

CR4 i[)BV(1) J101-65
CR4.- iDBY(J) Jl01-65
CR4
CR4
-- .
CR4 .
CR4
,-~---

Time
Interval
Milliseconds

------1
2.78
2.78

,------f

-_

6.08~ SlCI) Ca-t-ho-d-e-C-R-4.··DBV(1)--J!01:6~ _ _
0_
JIOI -65 JIO)
19.9
53(1) Cathode CR4 'DBV(l) JIOl-65
0
~----'--""-------'-1i------- .~--.--.--Jl01
_._
.....
~6:.a....~08~_ _....._5_3_(.....;.I)_Ca_t_h_ode CR~ :~~YJ,!t.~~~ -65 .__L_Z§_._._ . .
JIO)
___6_.0_8____ 53 (I) Ca thode CR4 :i5BY (1) J 10 1.. 65 .._.__..........=8=-----1
5,;. .3(;. . .1.:;. . )_C_a_th_o~ CR4 :i5BY (1) ..:!.!E1:.2? .____,..5.!t._
Jl01 -65
_ 89. 0 ___--.-11-JI01 -65
9.4
S3(1) Cathode CR4 'DBV(1)_ Jl01-65 __,_....54______

HALTDELAV
FROM'

,
----TO
~-----

6.oB
Jl01-65
19.9
Jl01-65
6.08i
Jl01-65
..-'--...
Jl01-65
6.08:
f--.-----.
89.0...
Jl01-65
9.4
JIO~-65_

DBY (0)

_ ..0,""_'_

---.

-~-~--~--------~

POSTDELA,'i

Time
I nterva 1
Milliseconds

Pin

DBY (0)
OBV(O)

--.5TROBEC(O) J101-5 OBY (10)

forward (BOT)
Read Reverse
..
Read Reverse (EDI T)
Gap or Write (BOT)
Write
Read

SIgl181

Pin

.-

-

Table 3-111.

, .•_--

NINE TRACK PRE/POST DELAYS (37.5 Ips)
"

PREDELAY
FROM
Signal
STROBEC(O)
Read forward
Read forward (BOT) LOP (1)
Single Read Rever'se
STROBEC(O)
Stack· Read Reverse (EOI T) STROBEC(O)
Head
Gap or Write (BOT) m(l)
. ....STROBEC(O)
Write
,....

_-_

Dual
Stack
Head

Read forward
Read
_.-....forward (BOT)
Read Reverse
..Read Reverse (ED IT)
Gap or Write (BOT)
WrIte

-~.

-

STROBEl: (0)
LDP(1)
STROBEC(O)
5TROBEC(O)
LDP(J)
STROBEC(O)

-

Pin

.TO
~-"'.'

Jl01-5 DBY(O)
r - - ' - - r--JIOl-4i DBY (0)
Jl01-5 DBY (0)
Jl01-5 DBY (0)
Jl01~4, DBV(O)
JIOI-5 DBY (0)

_.

3.
2.

NOTES

1.

•.-

--

-

Jl0 I- 65
7. :1
JIO I -65 ....
24.0
Jl0 -65
.--. 7. :J
7. :S
..Jl0..1-65
.-... _'...107. :1
J10 1-65
11. :1
Jl0 1- 65

_

_

-

--

-

-'~-'-.

DBY(O)
Jl01 ... 65
.._---JiOl-4i DBV (0)
Jl01-65
----... ..,-- -.
Jl01-5 DBY (0) -Jl01-65
•• 1-.
. - . -.•
Jl01-65
Jl01-5 DSy(h)
Jl01-4, DBV(O)
Jl01-65
JJOI-5 DBY (0)
Jl01-65

----_

r---'---;--

FROM

TO

Time
In terva I
MIDliseconds

S3 (1) Cathode CR.-4 DBY (1) J 101-65
3.34
S3 (1) Cathode .CR~~ OBY (1) J 101- 65
3.34
... ~-......-.-----..
51(1) Cathode CR~~ ._~.~y(1:~1-65 ..._,_O.o.--'_-i
-S3 (1) Cathode CR~~ DB Y( 1) J 10 1- 65
. 66
- - - •• - .• - - - - ..---- 1--.-....
53(1) Cathode CR 4 DBY(l) Jl01-65
5.3
---53 (1) Cathode
CR.-~. D~Y (~L..!!.Q 1-6~.
5,3
.I

-------

_ . . _ ....... -

--

-

~

7. ::s
24.0

- -

7.3

-.-~

-

7.]
---,,---"
107 . ~l

CBUSY(J~O

. 1-'----11.

--.'- -

I

J109

~S

53(1 )
S3 (1)
53 (1)
53 (1)
53 (1)
53 (1)

--

.... _ _ _ ••

,,~

..

~.

10.- _ _ • _ _ _ _ _ _

- - - -_ _ _ _ w' ......-._ _ _ _ _ . _ _

-

0
Cathode CR~~ DBY(1:iJ101-65 -~ ------- --------1
Cathode CR~~ DBY(1) Jl01-65
0
.. -------- ..._,-----". . _..
Cathode CR~~- DB Y (J).... J 1.......0_.1- 65
3 . 34
--_..-..._-"--,---,Cathode CR~~ DiY (1) J 10 1-65 .__.~_~4._.............
Cathode CR 4~ 00v(~~1-6~ ._.._~~_6_-t
Cathode CR~~ D'BY (1) J 10 1- 65
. 66

.- - - - - - -

.... ~---.

JIOI-6S

POSTDElAY

~

-r----.-

Jl01-5

~-----------~----,----~

I

PIn

SI 'gna I

HALTDELAY

DBY(J) FROM

Time
Interval
M1111 se~conds

-

II .3

(transition) = 0 means from +5V to OV, = I means from OV to +5V
WrIte
~ Write I record or write file mark
= Read 1 record or space
Read

._---_ _-_

T~ble 3~l2.

NINE TRACK PRE/POST DELAYS (25 Ips)
I

-,---, ..

PREDELAY
.~

_.FROM
SIgnal
r

Read forwa rd
Read forward (BOT)
Single Read Reverse
Stack -< Read Reverse (EDI T)
Head
Gap or Write (BOT)
.I>J
Write
I
0

.11
.11

TO
Signal

STROBEC(O) Jl01-S
iJ)p(J)
Jl01-47
STROBEC(O) Jl0)-S
STROBEC(O) ~I01-S
LDP(l) .
Jl01.-47
STROBEC(O) JI01-S

POSTDE lAY
FROM

HI 111 s~~conds
*""'

Pin

-

Time
I nteliva)

.".~~

TO

r--'--~

PIn
11
53 (1)
J101-6S
36
53 (1)
Jl01-6S
-----1"""
II
,S3 (1)
Jl01-6S
-_._-------11
Jl01-:6S._-S3 (I)
161
.2} (1)
Jl01-65
-....-1-.
17
Jl01-65
-'-I-.
-. S3 (1)

PBY(O)
D8Y(0)
DBY (0)
D8~iO)
D8Y(0)
DBY (o)

--~-.

--

~.

'-

Cathode
Cathode
Cathode
Cathode
Cathode
Cathode

-

-

Time
Interval
Milliseconds

_.

CRi..... __._)1-65
5
CR
JH)1-65
5
.CRi+ DBY (I) JH)1-65
0
._------_
..
-." .... - ...
CR£~. DBY ()) J H)1-65
I
------CRJ-.
)1-65
8
CRJ~'Q~Y{I~)1-65
8

--

----~

_-

--- -------------.--

-65-'- 0
S3(1) C'athode CRJ'_.~. Diy (l)JiC)J
..----... _
. _---S3 (1) Cathode CRI.~. DBY()) Jl01-65
0
..---_
.. _..... _...•S3 (1) Cathode CRI.l.....DBY (1)
J
1
()
165
5
....
.....
53(1) Cathode CRI~. £BY(!~)1-65
_7~_-4
S3 (I) Cathode CRI~. MY (!~t 1-6~. _____..__
S3 (1) Ca thode CRJ'~. OBY(l) Jl01-65

-=0; ....

Oual
Stack
Head

Read forward
Read forward (BOT)
Read Reverse
......-....-.._--Read Reverse (EDI T)
Gap or Wrl te (BOT)
Wrl te .

--

STROBEC(O)
LDP( 1)
STROBEC(O)
STROBEC(O)
LOP (1)
STRO~EC(O)

Jl01-5 DBV' (0)
Jl01-47 DBV' (0)
Jl01-5 DBV'(O)
Jl01-5 ~,(O)
Jl01-47 DBV' (0)
Jl01-5 DBV' (0)

Jl01Jl01.....Jl01.1--."-Jl0lJl01- 65
J)Ol- 65

HALTDELAY
fROM
DBY (1)

----_._
---------

II
36

_-_ _ -

II

11
-----..,-----~

161
-17

.

I

--I

-TO

-----

Jl01-6S CBUSY (1) Jl01-94

17

.3.
2.

NOTES

1.

(transition)
Write
Read

=0

m(eans from +SV to OV, = 1 means from OV to +5V
~ Write 1 record or wrIte file mark
= Read 1 record or space

-------~--------~

NINE TRACK PRE/POST DELAYS (12.5 Ips)

PREOELAY

Time
Interval
M1111 s·econds

TO

FROM
Signal
~

Read forward
Read forward (BOT)
51ngle Read Reverse
Stack -< Read Reverse (ED I T)
Head
Gap or Write (BOT)
Write
t

-

,-

Table 3-13.

5Ugnal

Pin

5TROBEC(0)
LOP(J )
STROBEC(O)
5TROBEC(0)

OB"(O)
08Y(0)
oBY (0)
oBY(O)
oBY (0)
oBY(O)

5TROBEC(0)
LDP( 1)
5TROBEC(0)
..5TROBEC(O)
LoP(J )..
STROBEC(O)

DB" (0)
OBV(O)
OBY (0)
.----oBY(O)
OBV(O)
OBY (0)

Dual
Stack
Head

------

Jl01~47

Jl01-5
.......
Jl01-5
Jl01-47
Jl01-5

FROM

--

TO

,-+-----~

~

------_.-

-. ..
~-

--

_ H ' _ _•

~--

.-.~

.•.

~

-

- .....

........

53(1)
S3 (J)
53 (1)
53 (1)
53 (I)
S3 (1)

Cathode
Cathode
Cathode
Cathode
Cathode
Cathode

DBY (1)

TO

--

Jl01-65 CBlJI5Y (1) Jl01-94

-

34

-3.
NOTES

(transition)
2. WrIte
1• Read

oBY (1)
----

J 101-65
10
DBY (1) J 101-65
10
oBY (1) J 101-65
0
DBY (1) J 101-65 -_ ....... 2
OBY
J)_01-65 1---_,---.
16
w_
.... _(1)
__
...
16
0~ Y(lL!.!.01-65

= 0 means from +5V to OV, = 1 means from OV to +5V
= Write I record or write file mark
= Read 1 record or space

_'- M

.-"~-----

- -.• '-0-

CR i. DBY{i)J~)1-65 -0--'
CR~~...... OBY
0
- (1) J) 0 1-65
CR ~~ DBY(1) Jl01-65
10
.... - ..
.. --- ....... -...--..,..,
.
CR~f DiiY(1~)1-65 __ .~__
CR ~f 'OBY(!~)1-65," ___2___.....
CR ~f OBYO) Jl01-65
2

._--

HALTOELAY
FROM

Time
Interval
MIllIseconds

-- :-._-----_._------

,

JIO 1-65
22
J10 1-65
72
... -'.. r---~--'
JIO ,..-,
1-65
22
__ ..J10 1-65
22
Jl0 1-65 ..
322
.............
34
Jl0 1-65

--

P05TOE IJ\Y

22
S3 (1) Cathode CR l~
Jl01-65
72
S3 (1) Cathode CR l~
JIOl-65
.--.- r---------..
22
53 (1) Cathode CR l~
Jl01-65
..
53 (J) Cathode CR l.
22
Jl01-65
- 53(1) Cathode CR.•L.
322
J 10 1-65
~-.---.. ...
.-'--53 (I) Cathode CR ~.
34
Jl01-65

JIOI-S
J101-47
JT01-S
Jl01-5
m(l)
Jl01-47
5TROBEC(O) Jl01-5
Jl01-5

_.,.-

Pin

"-

Read forward
Read forwa rd (BOT}
Read Reverse
Read Reverse (Eol T)
Gap or Wrl te (BOT)
Write

-

.~------.

...

_----

~-.--

,-.--~.~.-

------_

Ta~le"-14.

,

SEVEN TRACK PRE/POST DELAVS (75 Ips)

...

~

PREOELAY

TO

FROM

-"-~-

Signal
Read forward
Read

forward
Single Read Rever'se
.•
Stack R
ead Reverse
Head
Gap or Write
Write

STROBEC(O)
..(BOT) LDP(1 )
STROBEC(O)
(EDI T) STROBEC(O)
(BOT) lOP(])
STROBEC(O)

Pin
Jl01-5
..•Jl01-47
JIOI-5
Jl01-5
JIOh·4j
Jl01-5

~

Dual
Stack
Head

.-

POSTOEl}\y

Time
Interval
Milliseconds
......--.--.

..------, -

FROM

-

'TO

t---,----

Pin

SI !Jna I

-_

DBV(O)
DBY(O)
DBV (0)
DBV(O)
DBV(O)
DBY (0)

Jl01-65.........
Jl01 ... 65
JIOl-6S
---...Jl01-6S
Jl01-65
Jl01-65

...--

3.66
12.0,.
3.66
3.66
53.6
5.66

--

------ _._---_.

--

..

STROBEC(O)
Read forward
Read forward .(BOT) , LDP (1) ..
STROBEC.(O)
Read Reverse
Read Reverse (EDIT) STROBEC(O)
Gap or Wrl te (BOT) lDP (1)
write
STROBEC(O)

~---~-.

_..

Jl01-5 DaV (0)
Jl01-6S
Jl01-4j DBY (0)
Jl01-6S
-_._-"
DBY (0) _.,_
Jl01-65
Jl01-S 1------_.
.........'...--...... _Jl01-65
Jl01-5 OBV(O)
Jl01-4j DBV(O)
Jl01-6S
Jl01-5 DBV (0)
Jl01-65

-.

S3 (1)
S3 (1)
S3 (1)
53 (1)
S3,(1)
S3 (1)

Cathode CR4
·
Cathode·CR-4
Cathode CR 4
Cathode CR-4·
.
Cathode CR.4
"cathode CR~~

OBV(I )

NOTES

3.
2.
1.

f----'-.---'-~--~-

-~.

......

3.66
____
1.67
--- _~3(1) Cathode CRt•~. DBV(~~IJ-65
12.0
S3 (1) Cathode CR ~_ ~~y(I :~~'1-6?
1.67
3.66
53 (1) Cathode CR4... ..DB
V(1) J I. -..-.......01 1- 65 -....... 1 .67
. ,._._ ...
3.66
S3 (1) Cathode CR.~ DBV (~L:!.!g J-65
2.33
-----S3 (I) Cathode CR~~ 'DBV ( ~~ 1- 65, ..-.-.2.:1_!
53.6 ........
5.66
S3 (1) Cathode CR.4 DBV(I) Jl01-65
2.33

-

.~,

---_. 1--_----

TO
Jl01-6S CBUSV(1) Jl01-94

-

It • • _ _ _ _ _

HALTDElAV
FROM

DBY(l) JIO
3.63
11-65
.
DBY(1) JIO11-65
.. 3.63
--'
0
DBY(1) JIO11-65
..
.-------..DBY(l)
JIO11-65
.33
......_... _-..
4.62
OBY(l)
JIO11-65
__._---1--'----4.62
DBY(1) Jl011-65
--,-,

-- ._-_
_------_.
-,.

Time
Interval
Milliseconds

5.66

(transition) = 0 mE~ans from +5V to O\}, = 1 means from OV to +5V
Write
= Write I record or write file mark
= Read 1 record or space
Read

_--_

_---_..

Table

3-15~

SEVEN TRACK PRE/POST DELAYS (45 Ips)
I

-

PREDELAV
TO

FROM
Signa.
Read forwa rd
Read forward (BOT)
,I ngl e Read Reverse
;tack
Read Reverse (EDI T)
iead
Gap or Write (BOT)
Write

-

Read
)ua 1

itack
-lead

forward
Read forward (BOT)
-.-......
Read Reverse
..
Read Reverse (ED IT)
Gap or Wrl te (BOT)
..
Write

STROBEC(O)
LOP (1)
5TROBEC(0)
STROBEC(O)

Jl01-5
JIOl-47
Jl01-5
J101-5
mO)
J101-47
~-5TROBEC(0) J1Ol-5

--

STROBEC(O) Jl01-5
m(l)
Jl01-47
STROBEC(O) Jl0J-5
STROBEC(O) Jl01-5
LDP(J )
Jl01-47
STROBEC(O)
Jl01-5
..

DBV (0)
DBV(O)
DBY (0)
DBY(O)
DBY(O)
DBY (0)
DBY (0)
DBY(O)
DBY (0)
DBY(O)
DBY(O)
DBY (0)

FROM

-,
-Pin

Signal

Pin

.'

S3 (1)
Jl01-65
.. 6.08
S3 (1)
Jl01-65
19.9
M_ -----.-----. 1-6.08
TI(1)
Jl01-65
-... --S3 (1)
Jl01-65
___._·v_ 1----. 6.08
53 (1)
89.0
Jl01-65
....---'---,--9.4
Jl01-65
_~(1)
_._-,,_.
f-o.------,.~

..

~

.....

--

6.08
19.9
6.0:8
6.08
:!.!2.!:- 65_"
89.0
Jl01-65
,--_... ,_._--,
9.4
J101-65
~..
Jl01-65
Jl01-65
-_.. __.. -ro-'
J 1.0 ..1-65
- ...

---_.- --_

_.

Cathode
Cathode
Cathode
Cathode
Cathode
Cathode

D'iiY (1)

NOTES

3.
2.
1.

-~-

,

S3 (1)
53 (1)
53 (1)
S3 (1)

Cathode
CR4
--_
...
Cathode CR4
Cathode CR4
Cathode CR4

9.4

Write 1 record or write file mark
Read 1 record or space

,

6.0
---6.0

_._-------'
o

.

----~4--

-_7.56
-7.56
........------.
J Ia I- 65
2 . 78
.......

....

I

= 0 me,ans from +5V to OV, = 1 means from OV to +5V
=

-_._ _--

-----~

I

c

,-

~

~__

(transItion)
Write
Read

_-------

S3 (1) Cathode CR4 [OB.!_<,,! )
.- ........ foo--(1
5)(1) Cathode CR4 DBY _)~!,~1-6~
--- .. ---

------

JIO 1-65 CBUSY (J) J 10 1-941

DBV(l) Jl0'1.65
CR4
.._...... -..
DBV(]) Jl0'1-65
CR4
._., --------_.......
CR4 ..
'.. --.-CR4
...
........
CR4
CR4..

~-

~_________H_A_L_TD_E_L_AV__~.
FROM

Time
Interval
MIlliseconds

POSTDELJ~~ Y

TimE'
Interval
M1111 se(:onds

._~~_ .. _.

2.78..- ---_--_ --_
3.86

Day(1 ).. ... Jl01-65
..
..
DBY(1 12.!..2.1-65
DBYO
DBYO

...

,

.Tab1e 3-16 ... SEVEN TRACK PRE/POST DELAVS (37.5 ips)
.--..-'_...I

Time
I nter'Va 1
M1111 seiconds

PREDELAY

_.

-

Signal

SIngle
Stack
Head

,
)

PIn

Time
Interval
Milliseconds

'TO

FROM

----~-

--

7. :1

Gap or Write (BOT)

LDP( 1)

Write

STROaEC(O) Jl01-5

DBV (0)

S3 (1) Cathode CRt• DBV ( 1) J 1011-65
7.14
.. -, .. ..
53 (1) Cathode CRt• DBY(I) Jl01-65
7. 14
Jl01-65
24.0
.-0
53 (1) Cathode, CRL• DBY(I) J10l1-65
Jl01-65
7.l
.*-.66
S3 (I) Cathode CRL;OBY (1 )JiOI1-65
Jl01-65
7. :s
........- ..--....-.......
..
r----.- - - - .
--.------9.1 .
Jl01-65
107. :S
S~(1) Cathode CRl• DBY(I) J1011-65
i
11.]
S3 (I) Cathode CRl; D~Y(I~ J1011-65. . ' - - 9. 1
JIO 1-~5

Read forward
.

5TROBEC(0) Jl01-5

DBY (0)

Jl01-65

Read forward (BOT)

LDP(1)

Read Reverse

STROBEC(O) J101-5

DBY(O)

Read Reverse (ED I T) STROBEC(O) JIOI-5

OBV(O)

STROBEC(O) Jl01-5

Read forward (BOT)

LDP (1)

--

--

5TROBEC(0) Jl01-5
Read Reverse (EDI T) 5TROBEC(0) Jl01-5

Gap

or Write (BOT)

-

-

Jl01~4j

Jl01-65

DBV (0)

-

DBV(O)
DBY (0)

-

DBV (I)

NOTES

-....--~

I

7.]
24.0

__
7.3
Jl01-65 _-,------_._.
7.3
--- 107.3
JIOI-65
_..•_,- .. ..
. 11. 3
JI01-65
-------Jl01-65
..
.....

..

-

DBV (0)

~

.........--...~.

53 (1)

Cathode CRt~.

(transition)

~~......-...

S3 (1) Cathode CRL• DBY (1) J 1011-65

-

2.

Write

I.

Read

11 .3,

= 0 mE!anS from +5V to OV. = I means
= Write I record or write file mark
= Read 1 record or space

J 1~Il- 65 - ..--2.:1~---t

_-_

--

Jl01-65 CBUSY (1 ) J I 01-94

E.'a Y ( 1)

__

_.

53 (1) Cathode CRt~. ~.B Y ( ~~~g 1- 6? _--.l.J.!t.___ .. _
53 (1) Cathode CRl•- ....DBY(l)
J1011-65
3.34
. __ .....-........
--,
53 (I) Cathode CR ~ 00v(L~11-65
4.64
53 (1) Cathode CRt•......
DBY(I) J1011-65
4.64
..

TO

3.

-------

-.

--.~-

-------- _.._,_.

HALTDELAV .
FROM

-~.-

.-~

-JIO 1... 65

JIOl-4j DBY (0)

LDP(1)

---

-

-

Jl01-4j DBV (0)

STROBEC(O) JI01-S

Write

DBY (0)

Jl01-4j DBY (0)

Read Reverse

,-----_.-

Dual
Stack
Head

S I ~gna I

Pin

Read forwa rd

..
...

_r_

TO

FROM

P05TDEI.AV

i

from OV to +5V

-_._-...: _4.64

~---------~--------~

Table 3-17. SEVEN TRACK PRE/POST DELAYS (25 Ips)
I

PREOELAV

--r--'-'-Time
.- Interval

TO

FROM

5 ligna 1

M1111 sElconds

Pin

Read forward
Read forward (BOT)
Single Read Rever'se
Stack
Read Reverse (EOI T)
Head
Gap or Write (BOT)
Write

STROBEC(O)
LOP(1 )
STROBEC(O)
STROBEC(O)
LDP(1)
STROBEC(O)

JIOI-5
Jl01-4j
JIOl-5
Jl01-5
J101-4j
J101-5

OBV(O)
OBY(O)
DBY (0)
DBY(O)
DBY (0)
OBY (0)

J101-65
Jl0l.65
.__....
JIOI-65
Jl01-65
JIOI.65
Jl01-65
.
=-

Read forwa rd
Read forward (BOT)
-Read Reverse
Read Reverse (EOI T)
Gap or Wrl te (BOT)
Write

STROBEC(O)
LDP( 1)
STROBEC(O)
...
STROBEC(O)
LOP (1)
STROBE(: (0)

Jl01-5
Jl01-4j
Jl01-5
JIOI-5
J101-47
J101-5

DBY (0)
DBY (0)
DBY (0)
DBY(e)
OBY(O)
DBY (0)

Jl01-6S
11
36
J101-65
_.. 11
J101-65
_._._,-_ ..- r--"
11
Jl01-6S
161
Jl01-6S
-.17
J101-65

Dual
Stack
Head

------,-

FROM

----"":'""

Signal

....

Pin

...

11

11
161

--17

.

-

DBY (1)

"-

-

--

_-----"

-

,
I

i
i

-

S3 (1)
S3 (1)
53 (1)
S3 (1)
S3 (1)
S3 (1)

Ca thode
Ca thode
Cathode
Cathode
Cathode
Cathode

NOTES

3.
2.
1.

TO
Jl01-65 CBUSY (1) Jl01-94

-.'.-

_. --_._-_._-

HALTOELAY
FROM

TO

+-----

Time
Interval
Milliseconds

11
S3 (1) Cathode CRt.
)1-65
11
S3 (I) Ca thode .CRj'l DBY(I) J1())-65
.....,...............
--0
TI(1) Ca thode CRjl~, DBY(l) J1()1-65
... - ------1
S3 (1) Cathode CRJ'~, DBY (I) JH)1-65
-----_
..
14
53(1)
Cathode
CRR.
+
DBY(l)
JH)1-65
... -- ....
..------ ~14
S3 (1) 'ca.~hode CRJ'~', ~By(1L!!~)1-65
..

----

-

36
---_._
I1

.-

POSTOEI

17

(transition) = 0 m(eans from +5V to OV, = 1 means from OV to +5V
Write
= Write 1 record or write file mark
= Read 1 record or space
Read

-.--~

1
CRI
5 --'--I
-..~:..~_"iiY_(~_)_J!~)J - 6~' ______
1
CRI~~. ~BY (1 ~.~) ~-65
S
_.... _
CRI..~~ ~~!J!~~~_~) 1- 65 _..2-___,__
CR~~ DBY(1~11-65_~_~
CR ~f DBY(.!~)1-65 __.-1.-..
CR~f 00v (~~)1-6~."-._7_ _---'
_--t

Table 3-18.

SEVEN TRACK PRE/POST DELAYS (12.5 ,Ips)

,

I

PREOELAY

TO

FROM
Signal
Read forwa rd
Rf;!ad forward (BOT)
Ingle Read Reverse
tack
Read Reverse (EOI T)
lead
Gap or Write (BOT)
-Write

-

-

-Read

lual
~tack

lead

forward
Read forward (BOT)
----Read Reverse
...
Read Reverse (EDI T)
Gap or Write (BOT)
Write

_

... .......

' Pin

Signal

Pin

POSTDELA'V

'rIme

Interval
Milliseconds

----.---'-.

~----:--

FROM
1--

STRQBEC(O) Jl01-5 DBV(O)
LOP (I)
JIO 1..,4j DBY (0)
STROBEC(O) Jl01-5 DBY (0)
5TROBEC(O) Jl01-5 DBY(O)
LOP (I)
JIOl-4j DBY (0)
STROBEC(O) JI01-S
OBY(O)
--,-,

22
53_.(1)
Jl01-6S
----53 (I)
Jl01-65
72
... _.....
.
53 (1)
Jl01-65
22
1-'
f---------,.
Jl01-65 ___-...U_ _ _ S3 (1)
53 (1)
Jl01-65
322,.
...
-'" 1--'
53 (1)
JIOl-6S
34

5TROBEC(O)
LDP(l)
STROBEC(O)
STROBEC(O)

Jl01-65
Jl01-65
.. _--"
J 10 1-65
... ---- ...
JI01.:65
Jl01-65
--~-- .....
Jl01-65

~--:-

-

--

Jl01-S
Jl01-4j
JIOI-5
Jl01-5
m(1)
Jl01-4j
5TROBEC(0) Jl01-5

-.-.~

---~

---

DBY (0)
DBY'(IO)
OBY (10)

--

DBY (1)

72
22

'-~

DBY~O)

OBY(IO)
DBY (10)

HALTDELAY
FROM

22

22

__1.?1_

....... ' 34

_..

TO

Cathode CR4 ..DBY(I) JI01.65
Cathode CR4'
...- .
Cathode CR4
--Cathode CR4
-----.
Cathode CR4
Cathode CR4
,

_ _ to

NOTES

----'-r------.

---

. '.
"
53 (1) Cathode CR4
10
10
S3 (1) Cathode CR4
-,
S3 (1) Cathode CR4
5~ (1) Cathode CR4
S3 (1) Cathode CR4 ~BY (1 L~1~~5 ._._~~~. __.__
53 (1) Cathode CR4 DB Y ( 1) J 10 11- 65
14

1--.

--34

..

2.

(transition)
WrIte

= 0 means from +5V to OV, = 1 means from OV to +5V
= Write 1 record or write file mark

1.

Read

• Read 1 record or space

3.

22

'----1

~-

TO
Jl01-65 CBUSY (1) Jl01-94

Time
Interval
MIllIseconds

~

--_._-'--_._----"

SECTION IV
DRAWINGS

Logic

Ciock, Tape Speed Seiect, Density Select

Logic 2

Status Unit Select Reject Logic

Logic 3

Command Register Reset Logic

Logic 5

Delay Counter

Logic 6

Computer Adaptor to Formatter

Logic 6A

Fonmatter to Computer Adaptor Interface

Logic 7

Tape Units Interface

Logic 8

Read Data

Logic 9

Wri te Logi c

Logic 10

Write Register & Parity Logic

Logic 11

Write Data Gates

Logic 12

Read Control

Logic 14 State Counter
logic 15

CRC Generator

Assy. -

76132

Oelay Counter

76133 CRt Generator
76134 Clock, Tape Speed Select, Density Select
76135 NRZI Formatter
5091-116 Magnetic Tape Controller
940047

Power Supply (3 sheets)

1080000

Power Supply

180500

Power Supply

4-1

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WARRANTY

DATUM, Inc. guarantees this equipment to be free from defects
in material and workmanship, for one year from date of del ivery. Any
repairs, or replacements (which alternative chosen by the manufacturer):
will be carried out at the fac iIi ties of DATUM wi ~h transportat ion costs
charged to the purchaser's account. Should a defect occur in equipment
which cannot be returned feasibly because of physical size, or should
the defect be trivial, the purchaser will be expected to perform first
echelon repairs "using materials suppl ied by DATUM. Subsequent repairs
within the period of warranty will be negotiated separately.
If a defect should result from a design error, and both DATUM
and the purchaser recognize this error as the cause of the defect, DATUM
will correct the error to meet the specifications under which the equipment was delivered.
DATUM retains the right to return the defective equipment to
the company 's facilities for repair should this course be deemed necessary or advisab1e.
Equipment, accessories, batteries, and similar items not manufactured by DA~JM are subject only to adjustments as can be obtained
from the original supplier by DATUM. This warranty does not apply to
any equipment, or portion thereof, which becomes defective through misuse, mishandling, or environmental conditions exceeding specifications,
after del ivery •
No other warranties, expressed or implied, shall apply to
any equipment sold under this warranty, and the foregoing shall constitute the purchaser's sole rights under the agreed terms of this
warranty.
In no circumstances shall DATUM assume liability for loss,
damage or consequential expense arising directly or indirectly from
the use of its equipment, separately, or in combination with other
equipment.
PH 30004.0
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