TC08_Engineering_Drawings_Dec76 TC08 Engineering Drawings Dec76

TC08_Engineering_Drawings_Dec76 TC08_Engineering_Drawings_Dec76

User Manual: TC08_Engineering_Drawings_Dec76

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DIGITAL EQUIPMENT CORPORATION

CONTINUATION SHEET

MAYNARD, MASSACHUSETTS

TITLE
DATE

Te09 & Te08N CHECKOUT PROCEDURES

TiTLE

Te08 & ~COSN CHECKOUT
7.

By removing tho Ca8S in slot Ala and adding 11 tomporltry
jumper betweon n14K2 dnd Dl4Ul, and also cnanging addl'lSS 13
of tho provious program to ALL ZERO's! I '1'ho progr"m n.ay bo
useu to fire the 3P DY Which should now be set to the value
noted on tho prints. After the SP DY is sot, remove the
Jumper, insort tho G8RO back into slot A18, and replaco tll(.'
origindl contents of addrosE' 13 (¢4~~) .NQiE THE \.OWER

O.

By atlo11tllP

I!LT I/O SK1P

Place unit 8 on-line and write enabled. Place WRTM normal
switch in the WR'I'M position, Start the ptogrdnt, Tho clock
should be ~et to the valve noted on the prlnts.

PRELIIUNAIW CHECKD AND 'lETUP

T~8t

D'1'LA

5¢¢)4

7402
'12¢¢

~'1¢2
~¢¢3
¢¢¢4

Connoct tho 716 power ftupply to tho indicatoL sy"cem and install
cables, Pa~ur up the empty logic panel and the indicdtor
uystom. All indicators oxcopt thoSQ thut nra deliberately
tied to ground Hhould ba ON.

2.

CLA
'lAD

track clock may be enabled:
fltart

1.

1.

AI

And mado to run

correc~ly.

511E ICODEI
NUMBER
M I ';1' I 'peOH-O-H.

NUMBER

1

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61'

OEC FORM NO
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SHEET _1_ OF ._,,_

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TITLE

TCOAN CIIE:CI1"11
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With aU of thn tranllpo'-ts boinq "'hipporl with tho BYStOI1l,
Deelrox t should be run for a minimum of ot:r; hour por
transport.

CLEANUP AND

ADDITIO~AL

TESTS

1.

Chc-ckout of the oontrol i'! now oomplct(',

2.

Moat DECtapo systems are shipped in a cabinet and the system
must be run after ita installation in the cabinet bofore
acceptance.

blts 8-11.

5.

'1¢'15

The control mU9t run DECtrex 1 for ONE hour error free at 55

I/O SI07 SHOULD DE <;ET TO !'0StTION'l

T}'I,is proQr<1'1l

D. Lazuka
OEC 'OIlM NO
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DIGITAL EQUIPMENT CORPORATION
CONTINUATION SHEET

MAYNARD, MASSACHUSETTS
TITLE

ENGINEERING SPECIFICATION
TITLE

TC~8

Ascepta~ce

DATE 10/2/70

Procedure

~~:

REVISIONS
REV

DESCRIPTION

ORIG

jcHG Ne:

DATE

APPD BY

'1'0 defl.ne t ' e proced~re to a~::e~)t a TC¢". DECtape
Ccr,troller for "hl.p-::!:'t.

DATE

I}
?)

4}
5}

6)

A PDP-8 faJ"111y cc':-p'Jter
One cr J"1ore TJSS or ~U56 ta~~ tra:,~ryo=t~
TC¢3 Lndl.~ator ~are~
716
lndl~atcr s~~p:y
783 or eqLr,'aler:': sUPFly
A 'IC!,] cr TC28-:' G0perdlns on t~e cC'1I'!ut~r C'utp_t
bhS

pola!:"~ 1::"

1)
2)

':C$''1l

Bas 1C E.:erclser

TC~l

Rand,~ E~erciser

1)
2)
3)
4)

Make Slre all ECO's }aTE> :::~en lnstalJed
Perfor~ OC lPspectlJn
Make tre -a::,1.C J::yerCl~er cun on ea~h tran<::;:>ort
Run the R.~pdo~ E-::ercl!:"er for a '"tHn1.'TUm of one hour
:or eae! drlve that 15 to .De <;r.lppcd ""lth the system.
o errors are ac~e7ta~le.
Run DECta~e :orr~~t~r prc~=a~ on ea~h drLve.
If the S_ su,,_' ha05 e> tra T" "'-0,:y. run tbe DECta:,e
E.-.ctended He~-01. y E-.:erc 1.5 er :'0::: 1/2 lour 1: er dr 1." r

S}
6}

tran:sport.
7}
8)

S

If t"e s!s"t;e~' b"ls ani other O-;.t3 LrsaL- d(> VA:';J)ECS
Co'npl ete ~ Pt: c" O::Ctar'" system soft\.;are 1.ncludl.ng

3)

TC~8 Prlnt oet. of t;-.e latest ri>V1S10n.

L10rary sistnrr

ENG Larry ~;ar'll

o£c

fORM NO

ORA 107

IA

SIZE ICODEI
~'(

I

NUMBER~

\co~·,;;..~

.....

J

ta~cs.

REV

SHEET _1_ OF _2_

DEC fORM NO
nlla tC!U!.

SHEET

-..:L-

OF

...3..-

DIGITAL EQUIPMENT CORPORATION

ENGINEERING SPECIFICATION

MAYNARD, MASSACHUSETTS

TIT\, £

ENGINEERING SPECIFICATION
TITLE

DATE

10/1/70

TC08 Englneer1ng S "clflcatlon

CONTINUATION SHEET

'reo!! Spec i fiell t lon
1.1

G~neral

DescrlPtlon

REVISIONS

REV

DESCRIPTION

FHO NO

DATE

ORIO

APPD BY

The DECtapc system l.S a computer perlpheral WhlCh stores
dlglta1 data on 3/4 lnch magnetlC tap<> ln a thrc<' track
parallel/serial format, with which the data can be
accessed in blocks WhlCh are read or Wrl.tten HI both
dlrcctlOntl.

DATE

1.1.1

1.1

1.1.2
1.1. 1
1.1.4
1.1.S

1.2

DECtapo iR " pl'riphcrlll for lhe "Oil rilmily of
COllipute"UI.
E 1
bus through WhlCh both control nod data 1nformatton pass.

Gcnl)ral Ol)l:lcript ion

1.1.1

A Computer Ppripheral
Storcs Digital I.Mta on 3/4 In"11 Mdqlll'lic 'l'ilpO
Storos Data 1n 1I 'J'hrco Track S<.·lla1!Parnll .... l l'ClrI1lllt
Data Cal' Be Accessed In Blo::ks
Data Can Be Accessed 1n Both Dlrectlons

Operational Description of DEClape

1.2.1

Tho

'l'ap~

Surface Recording ForM"t

1.2.1.1
1.2.1.2

DEClape !leads and Tllpe Tracks
Tape R.2

EnvirOI®nntal Requirements

1.5.3

Power Requlrements

I

Cornput er Syst<>rn

-f1.9.2<''''1.___-+-___________- i

TevS

TU55. TU%

PPPR/t., PDP-tVE

TCOA-N

'1'U'l5, 'I'U%

PlJPfl/l. PIW-B

L. Narhi

NUMOU4

SHUT ...!- OP ~.'.1..L

ote 'ORM NO "-1011

SHUT

\)11" lOll

ENGINEERING SPECIFICATION
T1TU:

mama

CONTINUATION SHElT

ENGINEERING SPECIFICATION

'I'con Rp,,(,\ f H',\ t lOll

1.6

1\(1)",ltlllt'111

1.e. .1
i.e..2
1.6.3

1.7

Tnl~

Prom ('ltll ..,.'1

lrl5 blts pcr trdcK lnch.
Tlw t,It)." n1nv('1'1 itt it 'l1'''(d nf ')1 .. 12 ill"ll('"
pC'r 'Iceonti, .lnd can store \I:, to 190,O()O
1 "-h I t .....ord·,. 'J'hc 11J55 ras 011(' dr 1 V", ana
lh(' TUS6 has two drives.

till.! Clc.,,'k

'I'he Unl t or Mot lon Delay

Summilry of Statlstlcs

1.1.3

Storl'~

D~la

Tn A Thrp(, Trnpk Rcrlal/Parall('l

I·Otllh.ll
'l'ht.' uala ill lho btCtap,· SYFlt.('1I1 i.., SLOf('d in
l" J '-bl.t W()lu,''''>rially albllr t hC' dlr<,,'t Ion
\If (I", ",'\1I\J'It- I "all 'l"lf" t at lall(h'l\\ a\ly bloc;k,

to wr t"C or read a qroup of ...,on"'.

I'~I IC.~e'l

NUMBER
'\

(,

11

I

REV

"UMDER
'ttv,. -" 'i
o~c

'ORM NO 11-1021

!)IIA 1011

J

SHEET ~ O~ ~

ENGINEERING SPECIFICATION
TITLC

Teon

BRum

ENGINEERING SPECIFICATION

CONTINUATION SHUT

8p~clrldatlun

01 nllmb •• }' (It \wnt,. In t'f\~'11
,'luck i [I JJru-dt>t eYI1l hH,t1 WhN\ t h,' t Clpo it at! lI'
ia furmdllpd. Porl1l3lting involvrs writing

'l't\\;I It!II' t h,

ltn~kn 1,('xl tu Ltw UtnllllJ t['(V'k!t
are called mark tracks. 'rhese record
the instructlons WhlCh tell the TC08
controller where the tare is and what
type of data iq ~tored in the associated
information trnckR. Thr information
or da~a tracks are placed in tho middle
Of the tapo, wh,'re the effeC't of IIkt)w
in at a mlnil1lum. AlJ arc the liming
and mark tracks l the data lrn~kR aro
paired up.

'['1\01' twu

a timing track and a mark track on two
(non-data) tracks of the trpc'. and numbering
the data blockq. During formatting, thp
programmer can select tho length of thl'
hlocks. Once sot. thp len'Jth cannot b<,
changed without dcatroying data on tlw tnpc.

1.1.5

Data Can Bo ACCOfisod tn Both Olr('('t iOlla
Each block can be idontifit)d hy the computer
no mntter which way the tapt-· ia moving.
Furthor, datil can b(' road llr wr itten in
either dirQction. Thi~ fCAturo ftl1nw~ tho
t>r<:>gratnltler relati.vely fdst scarch time since
the tape docs not havn to br '"o-wounr1 bt·fore
a block can be searched out. and the programm~r
can beg1n to wrlte no matter Whl~h end of the
blOCK appears first. It 18 important,
however, that the programmer read and wrlte
the same data in th~ '1amo d 11"(" t Lon, or
else be prepared to unscramble it in the
computer.

1.2

Operational

CONTINUATION SHUT

flTU:

Dcq("ri}lt~ot.

h1qh reliability of tha rerordingl
reading syslem is because of lhe way in

Th~

WhH'h thQ 10 tr1\('lul

five pairs of

ilf\:l

(hvtd]t\ tillu

counlerp~rts.

rhat is,
hN\ds tor each track are
wired 1n serie., and r~cord and wr1te
the same lnformatlon. Durlng reddlng,
the analog gum of the two heads 1S used
to detect th~ correct value of the blt.
Therefore, a bLt cannot La mLsread until
the noi3P on the tape 18 Bufficlcnt to
chanac tlH' poLlrity of thl' ',um of the
slgnal~ belng read.
During wrltlnq,
corrcspording heads record the Bame
inform" II on.
corr(,8~ol\din9

of DECtapo

Information flow ~'i thin the DECtape sY'ltem is
dotE-rmined by the rocorc.li.ng forl\lilt on the tape
surface, and the internal architecture of the
controller.

in summary, the five pairs of tracks
conSl.t cf - t~c timinq tracks used
to slrobe the oth<'r track'3, the mark
tracks which store instructions, and
three data tracks. An 12 l.>lt 1>01>-8
word, then, used 4 lines of 3 data
bils cacho

NUMBER

,c.c. lr
DEC fOAM th.' "-10"

SHEET

ORA '08

ENGiNEERING SPECIFICATION

II!DOma

--.5.-

OF

.§..£!..

'/1-'0"

1.2.1.2

REV

..2£_

CONTINUATION SHEET

The recordlng zone lS dlv1ded lnto
blocks. Each block w1l1 store a
spcclflC number od data words and
s('vcral control word~, lncludlng
l.t'l own llddre3<; 01 block numh0r.
Thl' !lumber of words quch a data
block wlll "tOrt::' lS d('lernl1ned when
thC' tape is formattod. NorMally,
one r'l'l 1S formented wlth 1474
hloch;. each with 12<) 12-h1 t word~i.
llOWt'VCl, th.;: tot"l l('nqth of the
tape lS cquival<'nt Lo 884, 7JL 11no.
winch c . 111 L.;: d 1 V 1dc d lit Lo any
number of blocks up to 4,09b.
CorlpJ .;:tp lnstructlons on how to formo.lt a tape arc ava1lablc lTl th<:!
DECtape Formatter. (The numl:er
of blocks 1S Ilm1ted by thlS formatter).

I

~--------------------------------------~~~~~r-----~~~~---r~~
S'lE IC~"D, EI
REV
A
I '\c c/o;NUMBER
0
j',

I

SHEET

.-L

Tape Recorelng Format
A reol of tapp muqt bc pre-formatted
bofore It can be used on the DECtDpc
"Iystcm. Thl S lnvolveB logIcally
dlvldlng the 260 foot length lnlo
thr('t' ~oncn - two I'lld zonCH and n
record ing zone. Thp ('nd z call<,d timing
tr~cks.
On the.e tracks slgnals arc
pre-recorded at a fb.ed frC(luency, and
used to strobe lnformatlon inlo or from
the other tracks. The tapE! controller
synchron1zes on these pulses.

1.-"",

--Z- OF

I

The Tape Surface Rccordlng rormat

Roth t~0 data and th~ in~tru("tlons
arc stor('d ln, or r('ad fron', lll(,
magr.et ic tap') through r"dcl!wr Lte
h('adl! WhlCh maqnl'tao th'" lape in
one of two dlrectlons to represent
a "0" or a "1", and read the same
lnformatlon back. There are te,.
read/wr1te heads dlstrlbuted along
the wldth of the tape, each head
cover1ng a narrow path called a
tape track 01 channel. Flqurc- 1-1
shows a tap~ stretched over the
ten heads to indlcate how the
wldth is divid0d inlo ten tracks.

ORA t08

i ')

TITLE

'!'Wo lntportant DECtape fealures - lnd1vidually
addressable blocks and bldircctlonal readlng
and wrltlng, are the re<;;ult of the tape
surface format. ThlS stores not only data,
xut also InstrucLlons telling DECtnp0 what
to do WIth the data,

OEC FOAM NO

SkEET

ENGINEERING SPECIFICATION

CONTINUATION SHEET

I-T_IT_L_E___'l~Ofl SPt'C I f ic,1 t ion

1.2.1

DEC FORM NO
DRA t08

0..1

OF

..:f!'~_

NUMBER

\""'\. -;.,) ~
DEC 'OR~ NO 111-1021
ORA 10a

SHEET

-L

OF

50

ENGrN~ERING
TITLE

SPECIFICATION

ENGINEERING SPECIFICATION

CONTINUATION SHEET

CONTINUATION SHEET

TITLE 'J'COtl Src'clflciltlon

TCOS Speoification

Each data block on the tape has the
followlng charactenstlcs:
(fl-g. 1-2)
1. It lS numbered and ltS number l-S
conta1ned 1n the data tracks of the
block n~ber area at e1ther end of
the block. ThlS 15 to say that the
computer can ldcnbfy a block from
its number Ly approaching thE' block
from C'lthcr dlr('ction. The block
can then he read or wriltC'n lnto, 1n
e1ther dlrectlon.
A 1ong1tud1na! :'arlty checksum

2.

.....

......

.....

......

NOO'E TfLl'" EACH PAIR OF
HEADS I~ ACTUALLY WIRED
IN SERIES, AND 'tWO WIRES
ARE Rutl TO A OIFFERENTIAL

AMPLIFIER, FOR ~IMPLICITY
A SINGLE WIRE FOR EACII

3. Hpaccb are e'l tabll'3hC'd to de llnea te'
block." and Within each block, hetween
the block nUl1lber and the data area,
so aq to glve the computer time to
react to the nwr.J'er (1. e. set up the
data parameters). 1hc controller

PAIR tS SHCMN IIERE.

Figure 1-1

OECtape Heads and Tape Tracks

NUMBER
\1 c,"

Dte '0""

ORA tOI

NO '.~II'»

SHEET

ENGINEERING SPECIFICATION
TITLE

15

calculated by the
controller and deposlted lnto the
par1ty check area of the block.
There 1S a par1t} ctlcck at clther
end of the block so t1lat the checksum can then be depos1ted no matter
1n WhlCh d1rect1on data has bce~
read or w1rtten. When tl'c data 1S
read back, thlS checksum is r('calculah'd and compared w1th the
origlnal. 1\ny dlllcn.·p.lncy 1'3 rpjlol't('d
to the computet.
automat~ca11y

~...,

iC;,,\<

--5L

OF

'::..,0

"

\I
1.I 't

"

~

1

It

...

~

\-

~
~

DR" loa

,,-,o~~

TITLE 'JCOll

v)")

SHEET

...l.L-

OF

50

CONTINUATION SHEET

SIJC,'I fH'dt )(\],

II)

III

V '0/

Ii(

"l.

DEC 'OR" NO

ENGINEERING SPECIFICATION

CONTINUATION SHEET

'I'COS SpC'clficatLOn

(/

!lUMBER

REV

J ",

l<1011tlfi(''1 til' ,llff.}].'nt arc m,ll')., tracy. "'h0'1<' ('['(1(><'
,II (' not ""<'11 by lh,· l'<.)!l1pllt r 'r, and .11'l' 01
flO intt'l"e<,t to t fit' TJto<]ramm. r f'Xf"'pt tor
th,' functlun that t1l('l pprform. A mOl"
d('t~ilftd brc')ydown of the m,)r~ lrnlk i~
glven 1n Chapter 2.

Q}

l-

'~"

,lI

(,

.-I

~

gC;

\.4
Ill+>

;:

c:

III 0
+J

U

~'O

c:

~

I\l III

't.

'0 III

c:

(~

ttl

+J

2!

1.2.2

II)

('1

\1nd("r thf'

ion 1'. thtlt 10gH' which
!,UperVl'llt,n of the

pn"qram thro1lqh 1<"1' \n·,tnwtll>n.
{'lelbl(' 1-:> d,H,(TibNl th,.' 1(\'... U\' truction<"1
[t consi:,;ts of 7 rcgist('l~ ,In" th(nr
cmlt'r, which In turn drlV(''1 t':qhl
select Itnes to the contlo! cable.
tach tran<,l'ort ('"n bf' din 1.. d 111t<' a
1.

A.

r"gI9t~r ,~jrh

OEC FOPM NO
DRA 108

"-'011

NUMBER
ic;Cy, -'" -,;r!.
SHEEr

NUMBER

REV

_L2- OF ..§L

it •.
DEC fORM NO "-'02~
ORA 108

SHEET

~ -~

..

_,_.1._

OF

...:2!L

ENGINEERING SPECIFICATION

ENGINEERING SPECIFICATION

CONTINUATION SHEET

TITLE

TITL! ':'coe Specification

CONTINUATION SHEET

"COB Sp<'clfic..ttlOI1

pftrticular selC'C'tion address by mNUI'1
of 1 Dwitch on tho front of tll(' tram,port.
r[ the numb<'r decoded fro:>1 the tTnlt
Select Regi1ter corresponds to the number
s<'lected on the sWlt('h ttl':!n thdt
transport wlll ac('C'pt mot lon <-ommand';
from the control1(>r. If mo ..'C' than one
transport is on the same numbpr, then
an t'rror flag is posted as soon a', an
attempt is made to lnltiatt' operatlon.

All of these bits 0 to q can be read
back lnto the comouter u'1der the
instruction Rl'ad Status A. (DTAA).
The error flags can also be read l.nto
Hie accumulator lnto AC blts wInch
correspond to the bl.ts shown ln
Flgure 1-3. F\lrther, the DECtape
fJag is read lnto ac~umulator blt 11.
Blt', 0-6 and blt 11 are known
c<.)ll('ctlvel~· as Status ll.
'II e JOT
lns truct lon WhlCh reads them i.:; ca'lled

2. The Motion Register. A 2-bit
double buffered r~glster that commands
the selected transport to stop, qo and
move forward or go anu move in reverse.
Note that ea~h transport remembers its
motion, and if it lS subsequC'ntly
unselected without being stopped, it
will continue until it is re-selC'ctC'd
and qtopped, or until it runs out of
tape.

DTRB.

In Summary, the S~atus A reqlsters are
set under JOT conunand. They dC'termine
the operation to i.>(' p'~r1orm~'d, the
tr'ln',port Whlch 1., to perform that
operatlon. the dir<::ctlon of mot lon,
and thC' mode. Anv errorg are communicated to the computer through the
lnterrupt lOqlC, Sf an opcratlon l~
successful. then that too 15 communlcated
back to tho cOmptllcr, winch then -tukes ~- .
further action. 'fhe dctual lnforJ.ldtlOI1
transfer. are tak<'n Cdro of throug~
th" multl. cycle data brp8l- lxplaincd
in Table 1-4.
3.

clth~r

The' F'tlnctlon Register. 'rhis ill
1-bits long, and is dccodo1 by a binary
to octal converter to 'lclf'ct ono of a
p030iblc scv{'n funct ions. An <'xplanation
of these 1ut)ctlons is <"lvcn in Tablo 1-4.

4.

NUMBER

NUMBER
"-''' •

SHEET

ENGINEERING SPECIFICATION

I . ) ...

...!..l.

Of ~

DEC fORM NO
ORA 108

'\(.'.~

"-lfJ"

SHEET

ENGINEERING SPECIFICATION

CONTINUATION SHEET

v-).:.

--1.5..-

OF

SO

CONTINUATION SHEET

TITLE

S. Enable the Interrupt. A I-blt
regLster whlch. when sot, allows the
controller to use its PI lntcrrupl
sy'Jtcm. Whpn rC!let, it disconnects
DECtnpe' from t he interrupt 1 1 ill'S •
1n thc' dl',cOnnf'cl "t"le non.· 01 Ihe
;'rror ('ondltioll' or D1:Cl<.l}>P t ] ,hI Cdn
cau'3C an l')~('rru\')t. In no (It',pr
way, how("ver, 1'> stalub l' ,lfi("ctco.
6. '}'h(> ERROR Flag" arc fllp flops
whie\> continually examine !,os51.ble
error condltlons durlng the operation
of the transport. Each condltlon
l.'3 e· also a single
flip flop whlch sets, elther when an
oporation ha. hppn Buccrnqfully
completed, or whl"n it ha"l been aborted
us the rC"Iult of an error.

,

('0ntrol an(l "rr('lr fl "'J; III \' UO.J \
(0. r' and I J ) . ______" _ _ _ _ _ _
D'l I RA

(17GJ

HI",-Hl !'1tat.t's rcgistC'r A.

of '1tat us r",}1.8+;'0)." A
accumulator.
6764
M'AA

1',

t 1\1 1"'11

!

i

. h(l C'ontcont ..

('Red into the

I

XOR <;tat\,'" rp<)1<;t 0 r A. Th<' 0xBl,ectively,
lf tlwy are set to a Z0ro in the AC
dU-Ulq an XOR instructlon.
Till" completC' wl'rd trom 1 to 11 L'1 known a~1
Status A.

Oc,>cript:.on

0'1:;-- -----;,;;:2--- ·-;l"ar~:-~-;:-:;h:-;f.Ctap" ':

I

I

,

Octal Cod..

The 3 m~mory fleld hlts arc loaded from
AC 'llts (,-fl. 'Ill(' AC i' clral cd ~. Thp AC l~ ('10arcd and
t!'f' contr·nt of "tatus l! JS ()Red into

D'l'RJ\

th,· 3ccumnl:ltor.

I

ip on DECtnl't' flaq. ':'h,' '1ta\-<' o{
h(' 01':(' tape f lac] (DTI') 1'l '111m,,1,'d.
If it lS set to " 1, th,; content of
the PC ~'l 1n('rf'rJ"ntea by one to 'lkip
the nf'xt 'lC'quC'nt1al In'1t.ructlon.

S~

D1'D1'

t

.1
N\,jt,1&£R
Ole: '0"" MO
0"'" 108

,,-10"

"' ;G;r

SHEET

..iJ:L

I

SI]E ICODE ...
' _____
NU..;.,M_B.;;E..R__._JIoo.R_E_V.J

v·"' ....
OF

.:§!L

DEC FORM ,.0
ORA 108

"-'02'

A

I ...

"c:.~,

SHEEf

. .; ,,)

...JJz..

OF

..5i.J

IIIIIIII

ENGINEERING SPECIFICATION
TITLE

ENGINEERING SPECIFICATION

CONTINUATION SHEET

Te08 Speclficatlon

TABLE 1-1
-.

Reg1.ster

AC
Blt

unit Select

Slatus A-blt

_

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

'1\lb10

Asslgnm~nts

---- - ..----""----------_..... -----Dccodlng
--

000
001
010

0

011
'\.00

3
4
5
6

0'1:

SEARCH
(Ce,nt i nu,'d)

B

This Hoarch
1.

1

2.

3.

7

3

~

0 '"

Forward (FWD)
Reverse (REV)

4

1

o '"

Stop motion (STOP)
Start motion (GO)

1 ..

(MR)

1

c

"1 .,=

Mode

5

~

Functior

6,7,8

0,1,2
000
001

(FR)

010

011
100
101
110

111
EnabLe the
Interrupt

~

9

1 '"

(ENt)

o '"

l~

Enor flag

1 ..

(I!;~')

DECtapo flag

o '"

11

1 ...

(OTP)

5.
6.

Normal Nod(' (I,/-I)
cont inou'\ mod,> (croll
Operation
Move
Search
Read Data
Read all
Write data
Wntc all
Wr1te tlming
Unusc-d (cau'3e'J 'ilelect error)

READ DATA

Enablf' DECtape control flag
(lYl'CF) to thp progl'"ilm
ir.t0rrnpt.
C~r all ('rror fll.\'1!:1
Error flag'! undhturbcd
Cloal" DEClape f laC]
DECtap~ flaq undisturbed

L

Dp~rllllon

is most officient When
used in tilt' following way:
I
'1'h(' currc-nt block number is dot~ctcd in
!
normal mode.
'1'he difference botween it and the d('8ircd
blo<:'k nurnb0r is c()mpt:t<'r, and. the dirt'ction
c0rrcctod, if n('cessary.
If the diro~tion is reversed, read the
current block again and compute the new'
ulfference, otl'crwise go to 4.
The twO''3 complum('nt of the dlfforonce 1.5
loaded 1.:1to the \"ord coun~!lt~r.
Th0 function l.~q~O cont1nuous
mode.
On the' noxl interrupt, the tr.lnsport 1:OVl'r tho dOt>ircd block. 'rhe block
numb('r h in th('  DECtape ! \\;1ctlfm"

r------------------~----~

'lahl(> 1-4

-------------------

~'_L-,j-_,C-~_'-I'~l_O-N-_'------------------------------O--PL-'I-~-~'-rI-o-:-~---------------1
---------------.--------------------------------~.

-

READ DATA

'fhC' movC' [unetlon lS used to re-ulnd tape.

MOVE

SHEET

ENGINEERING SPECIFICATION

CONTINUATION SHEET

Spec1ilcatLOn

TC\ble 1

(

-------~--.------------j

Code 000 of blts 6, 7, anJ 8 inltlatc~
t1lP'" motion in tll<' 9,'lN'lN: di r<'ctio,l,
provid0d ';0 ;lS aha on. 'l'he makr tr, ck.
15 re>ad, but only thp C'nd of tape 1mtruction
1S decodod.
,ncl of tap0 posts an error flag
and cau'>es an lnterrupt to th .... computer.
If thl' tape control 18 uns. locted but not
qtnpppd, It cont1nues to r~n; huwC'ver, the
end of tap!' is nnt dete·ctod. 'The state> of
mode 15 lrr01evant.

(cont)nuca

tran'lferrE:'d prlor to the tran'Jfc-r. Data may
be' trunsi('rrcd tn forward or rcver,><,.
Any number of word~, e'1ual to "r less than a
block may be transferred 1n NM. The D1F 1S
r~ised and an 1nterrupt occurs at the end of
each block. 'l'he D'fF must be cleared before
tht beginnlng of the n0 v t block (l.e. 17 m~ec.)
to avold an etroneou,> tlm1n'J error. When
part1al blocks are tran~ferred data transmlSS10n
w111 end w1th WC overflow (l.e. the word
,,,hlCh aus<'s the .... e overflow),,> the last one
transferred.) However, tho rema1nder of
tht' block 13 read and parity chcckl'd bE:'fore
the DTt and 1nterrupt occur. Tape motlon
contll)tw'> until Lhe (,0 I'lL 1, r .... ::;(.t to 0 by
the l'roqram.
1 f the GO L1 t 15 not re'lct to a 0
or a n0W function 9D~elfl.C'd be foro Lhe end of
th" n(''«~ block, a llmlng error will occur.
READ DATA In ·:~t 1', lntendE'd prlrnarll\ tor
)-i.llql.', 12')-word l>loc~ tri'll)',("r',.
f ,IIW
otll('r lIumLE'r of worrh 1 to b(' tran·,fprr.~d,
It i, d._·rrupt b€'cause
there ),' no olher way to dr>termlnc when to
sLr'r ~h(' • <.Ipe or chan'le Lo anotlt('r functl0n.
r

1--------·------------------------------------------------';'hC' search f\lnctlon is used to search tor
blocks. Wh~n a block number i'l dc-tocted by
the mark track, thf' three-cycle data break
control transfers the number lnto thl' addr~ss
sp<"ctfu:'d by the curr<'nt addrc'l'> r~gi"t('r.
'rhe current address reg1stc::: lS not 1nf'remf>nt0d
6('\ that IlUCC'C'''S lVC> blo<:'k numbors a1waY'l go to
tho 'Him!' addr('d. Thib causes an 1.1lterrU}lt an.l the
program cap idontlfy the block numb('r.
In
continuous modo, no !ntl'rrllpt ocC'urq llntil
tIt' word count reglstor ovorflo#s.

SFARCH

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

L--.--------.--NUMBER

DEC

~lllll

ORA 101

NO

,,-,on

,c.~;;''''".l.~

SHt.ET

..LL

I

NUMBER
.., "j

REV

OF ~

~c..(...~

DEC FORM NO ItS-1022
ORA 108

SHEET

..6L

REII
"')

OF

..§!L

ENGINEERING SPECIFICATION
'ITLl

ENGINEERING SPECIFICATION

CONTINUATION SHUT

TITLE 'feOR Sp{'C'ifiC'ation

TC08 Specification

r-------------------------------,------------~

')'ablp

4

4

r------------------------------,
FUNCTION

1----_._-.-._----------'----_._---.,-- .- . -- ,
lilt' we ()vIHflow OC<'I!t"i;J, il: 1<1 ('E;iI'lrlllial
that the function b(. chanq,lcl or th<- Gn bit n(·t
to o. Oth<:'rwisa lronsi0r begins again (tilt'
IO'f to C'lt11n.' thn D'IT ilOl'licitly 'llH,dt'i<'1l th,'
Ramo !'.. nction aqain) at tht' next block (o"t" noxt
word [01' tIlt' ALL funcUontJ) t:linc() wc .. oonOB
is valid. Any numbtw of wtlnl!-l may bo
tran') fprr~d in eM.
'lo\,'''vC'r, lhe 1>',1' (Inc) 1111
intt'l"f\lpt. o('cur only {'TIl','  M'l'A
(continued)

..----

Wl1l1t\

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

(cont In'lt'd)

hOlma!

~.

tiD

n'''.... functiun is 'lpcdiic,d:

thco tllpo continun" to movl' but. thft writf'ro
ala dinnbled, and an ('rrot will ocC'ur.
i------.---~---------.--.~--~

WRT'l'E ALL

fot1l1<'1ttp/l tnJl.1I

t>MP/lUill1y l'NltHnlj ,Ill data ltal'lt ... rpc()t DI'Cl"I'0
control dONi not di'lt mquinll blllw"Nl (liff"l'I'n\
marks tl'c(1rdC'tl I)n th(' 111111')<; tl."lll!k ~ 1'>C<:<'Pt. tu
('heck for m'll k t.rack ('11 ort! (~ll''l'K).
In

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

In ('ontinuous mod.', thco 0'1'1' i ALL function allow,; information to

be r('o<1 i:rom 'l»u8un11y

---------- -

(lPJ:RA'j'[()N

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

WR 1'1 E OA'lA

.9

RPAD ALL

CONTINUATION SHU"

__

~_-~

_" _"'_

All tho d .. toils oi: tho RF.AD ALL function
d('acrir,tion apply. 'rh(' WR TTE ALL function
ift UIH'd to wr ito an unUtl\!,J 1 f(JI-mat (Huch a~,
block numb<'rs on DECtapc after tlming and
m.11'k trll/:ku hllVtl lH'N! rN"ol:'dNl). n1t'> word
which cause. we to ov<,rflow i'l the last on('
wrttton in NM ('r eM, 'i'lli' t nIl\! "('lItlnut' r( conHnq (Jt
lallt word. A1t(lrnot iVt methodl ,,('t we
to ono gleatcr than dcsirt'd nUlI'bcr of \~ord
tranof(lrfl and ('hnn.,., fUllCt'ioll witnirs 40
microseconds ai:ter WC oVt>rflow.

IIlJdc (NM) the Drr'}' is raised and

CaUses on interrupt ot: tho end of roach 1i-hit
word tran~ft)r. Dtlta transfer qtops t1ft/'r
we ov<'rflow, but t~lw m(lti('n contillUC'fl until
to GO bi t h1 S('It to 0 or a new function is

Non::

'l'ho \fC is in locntion //50
'file <.'1\ itl in loclItion 77!3l

(

I

'-------~--'

speC'ified (in both l~ and eM). If the DTr
is not cleared aftC'r each word trans fer, a
timing error occurs at the end of the n~xt
word (1.0. 33 ml('rOflI'Cond"l latt.'r).

,. ____________________,__'. ____,_~___. . . . . . ._. ______ li

DlC '0"" NO
D"A 10'

NUMBER
"'0 J

'tC.C?

,,-,m

SHEET

ENGINEERING SPECIFICATION
TITLE

...:ll.

',I

I

OF

NUMBER

REV

5?J

DlC

,t.< > v.""

'0"" NO "-IOn

SHEET

ORA 101

ENGINEERING SPECIFICATION

CONTINUATI,)N SHEET

TITLE

'I eml bl"'ci r lea t lon

.11..

OF

2-

CONTINUATION SHEET

'!'COll Sp0C 11 l("lllon

'l'al,le 1-4

r--------------------'-------------,.---- "LAG

Funct ion

----.--.----.---- --------------..------l
RFAD ALL
(Contin.Je>d)

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

ERROR FLAG

I:'or contimlou<' n'ode, the DTI~ 18 rai'lcd and
c~uscs an interrupt at we ovrrtlow orly.
r1' this intt'rn'pt is iqnot('d no 100rt" data
t. :lnllff'rlll ()CCur hu\ tnp" mollon continue') .0

I-"ivo types of errors can be d<'tccb'd in th<'
uso ot:: DEC'tape:
I'lllllng Error

parity Erro.:
SC'l('ct Error

EOT.

End ot: 'rapo
Mark 'l'rack Error

t-----------------.-----.- ... --------.
WRI'L'S DATA

Tho wr Lt'l cnab Ie owi tell on tho TU C} S or 'ru'i6
muat bo In write enable posillon for all
WRITE functions. All the details of thc
RFAD DATA function dpsc~iption apply wLLh
the following ('xceplionfl.

For ail "rror" thl" EI' 1& raised, a bit is s('t
In the status roglstcr and an inlorrupt occUJ:S
(if the cnahle-to-l.ntC'rrupt lnt hilfl hN'n set).
'l'he D'1'5F tnatrltction bkips on the incJunivc
OR oi: ~hose error b1tS: henco, C'ach Rtatus
bit must be ch 0 cked to d('t('rffiln~ the kind oi:
t'rror. For all bUl the- l>arity error, tre
1l(')('(-(('<1 t1'.l/l'1!'ort iH 8topppd nnJ tllt' F.P i"<
l' tlntC. of th(' ('rror d('trction.
No nrF (">(,(,lIr'I, }o'o1' 11 p.\rity (lrror, th.· no
),ll rl'millll~ 1 (Lr'" motion I'ontlrl\l('l'\ IU\<.I
I tl<' ~~. \ 1 1:1\ \'IN\ '} tl1\\\ I t (\n' Oil'. \ Y wi th t hc,
f)'l'[.' in ~'M.
Onl\' 1 lnt.·rrupt occur'lf ht"!1cC
I l\.-, proqr"m mU'll chpck t h. 1:1',

In normal moo!', the DTF is set to a ] at the
end of each block. Jf we overflow did not
occur in the block Just

~nd('d

and a npw

function is I'lpt'cifi(>d, the nexL block wU 1
be proct'B:H'd providt:'d tht' lYr!<' l,CHJ hl't:'n clt'ilr('d.
1 t we oVt'ri low did oC'ct.r in t h" bloC'k ]Ullt
("ndNl nnd no n!'w rUnt'tion ill IIpN:'HI.(>cl, t ht:'
tap ... COl\ti I\UI"I1 to mov<' h\\t lho wri t 01:'3 I\\.}
dtBnblvd, and an error will occur. 1~('
r!)m.lindllr ot th(' hlock is wriltl'l1 with
Z(I&:'OOIl,

A parit, ,'rror in eN rl:li-1"1I tIl(' £1" ilt til(' ('lid
of t ,I" block 1n which the l'arlt) occur/o 6-bit "lhift rc(;psters.

FLAG

MARK TRACK

CONTINUATION SHEET

Scl~ctio"l of none or mOrc than ] tran·'port.
Attemrt to write on D~Ctape transport
with WRI'l'E LNABLE/WRI'I'': LOCK switch in
t~e WRITE LOCK position.
Attempt to select unit f':>r any fUllction
with DECtape transport P!:r.tO':'E/OI'I'/LOCAL
sWltch in the orF or LOCAL (off-line)
position.
Attempt to ~Tit~ tlming and mark tracks
I
with the' DECtap~ control switch in any
I
posltion other than writ~ timi"lg and malk :

As the data is shlfted ln, the longitudinal
parlty buffer cal.~ulates the parlty of
each track. When a complete bleck has
been read, this buffer should be all
ones if no error has been detected. If
it 1S not all on~s, then a parlty error flag

J

DEC 'OR. NO
0 .. 10101

IS~E ICg~EI

,..,m

ENGINEERING SPECIFICATION
Teon Sped! icaLion

TITLE

..

1

NUMBER
"cc(~·c.-

REV

"'~

DEC fUR .. NO 111-10::

SHUT

ORA 108

ENGINEERING SPECIFICATION

CONTINUATIO:-.l !.HEET

'l'COH

'>"N'l f

I

*No-tape or tape-run-off-rcel cond1tlons
are not detectable.
ERRO~

TIMING ERROR

I

0"10'08

I
I

Parity Error - 1\ parlty error occurs only
during the READ DATA function for a
hardware computed parity check character
(PeC) fallure.

t Ion

Alternately, lf a wrlt~ operation 15
requlred, the 'fC08 requests a multl
c}cle data chennel break. The compuler
tranrfers lhe word lO be writt~n into
th., DEC! Ilpt' buffl'r, which 15 then
transferred In. a t~e Data R~ffcr nt
the rlqh~ time. rrom the data LU1[rr
lt is shlfted out and wrltten onto lhe
""'po, M"anlolllJe, the 1C08 reque3t'l
another word from lhe comrut~r as 'loon
db th€' DEClapo buffer is ernptl<~d lnto
the Data Euffer, and the TCOS 1S ready
to write tho next plcce of data.

-

,,1-'0:1

1(',\

If th". computer has not responded ln
tlme, a~ error flag is ralsed to show
the tlmlng error.

Tlllllng Error - A tlmlng ~rror (program
ma lfunc t ion) ~s a data mlSS or proqram failure
to clear the DTF status blt. A tlming error
OCClirR also 1 r lhu program Ilwi tchcs to REAl)
or WRI'l'E DATA functlon whlle the> DECtllpe 1'1
currently paqaing over a data IIr!'11 on tapo,

IS~E IC,~~£l
DEC FORM NO

CONTINUATION SHEET

Durlng a Read operatlon the data buffer
accumulates a complete l2-b1t word,
and transfers it to the DECtape buffer
for temporary storage. The Data
Channel flug 15 then ra1sed and a
m\lltl cycle d.lta chennel bl.eak lnltl'lted,
Durlng the break, thl.s word 19 trans ferre,
out of the DJ:Ctape huffcr 1nto the
locatlon sp0clfled by the current
addross rcqi<;ter at Jocatlon 7750. The
would count at locatlon 7751 1S 1ncroment('d, The computer lS allowed a
maXl!',\um of 33 us, to COMplete tIns
operatlon.

trac'k.
5. At'PnlPt "0 perform any function othe_ than
wrl to t lffilng and mark tracks W1 th the
DECtape control flWltch in the wrtte timing
and mark track posltion.
6. Attempt ,to execute unused funct10n (clfic~tiol'\

CONTINUATION SHEET

")or."...

~~~

At tho cnd of a transfer, tho word
count OV('l'f1ow'>, ancl the Dt'Clap'-1 r: tnq
is rL'liscd.

1.2.2.3

The Formatter

~

..*
'"'l

It!;!

.....J

.,.

fIl

..

1'V'-1

10;
o

~

..

..

,-

!II

;

fA

~

~

fIl
III

....
.. fIl
::l III
.. fIl
fIl rt ..
~ fA

S~ction

a reel of DECtapo can Le u~ed in
a system, it must first Le formatted.
This involves writinrJ the proper mark
track codes, numbering the data bloc~s,
and writing in the timing track. A
program called the DEC tape Formatter is
available for do1.nq thiB. '1'ho program
apcciCic8 th~ Writo Timing and ~nrk
Track function and !ran8f~r8 tho
corroct mark tract, code throuqh tho
data chZ'nnol intI') the DECtapc> huffer,
as shown in fi'luro 1_',. Only bit5
0, 3, 6 and q dro uRed, Tho controller
switch must bo on WRTM. 'l'he.,,, l>its
• arc lo~dcd into the plopcr shift
register of th!' Data nuffor, whh:h
then shlfts them into the mark track
wnte head and BO to the tape. In
normal mode the DECtdpe flag is
ralsed after each word i~ transferred to
the mark track. In continuou'l mode,
tho DECtape flag is raillC'd wh(>n th"
Word Count oVArflow5. Ncanwhile,
the- timinq trac!t writ I'r i.~ rN'ording
clock pultll"l' on the limlnq trllck.

III
ftI
::I
ftI
'1

t:

0 III
rt'O
... ;;J

0 ,D
~

11/ ::I

III

rt.
ftI

(t

!II

Q,
(

Q,

..
rt
:,-

'<;

0"

~

~

1Il

,..,

'1

"
f1
11

'"r'I

0"

,...

rt

rt

....

....
0

....

::I

.....
fIl

~''1"

_J

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...

ftI

1\1

g
~
o

~

'1

r.:

~

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(

Q,

,...

;'1

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~

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!

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r:

III

( rt
... 11/

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ENGINEERING SPECIFICATION
TITLE

'ICOH Hl",dt

i('n!

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..

'Ill!' J.lock

tllIt\l)

WHL1'1~ ALI.

morit'

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NUMBER

"\ c. C r (,) • .,;

REV

41J

D'C '011. NO "-'011
DRA 101

SHEET

Baa

ENGINEERING SPECIFIC"TION

CONTINUATI()N !;HEET

TITLE

J'CNl

REV

~J

..:.L

OF

_Or)

CONTINUATION SHUT

'leO!! 8PN'lflt'dllOIl

'r.:"

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','r . tlrt, writ1 en iI,


'f<'

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!}

IN

"t'

....rt

 rt '"3

'l'hell a Pl tc. 10<'81 i.on ¢

is lnitlAt~d, aR explained in
1-4.

&~()

'1

fP

.....,.

wrlttl.rl.

I

9
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rt
11

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o

til

III

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~

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ENGINEERING SPECIFICATION
TlTL!

..

CONTINUATION SHUT

TC08 Sp('cificatlon

TITLE 'l'COS Spocification

Table

-

1

6

INDICATOR
NAME

.,.."

CONTINUATION SHEET

INDICATOR FUNCTI0N

'I'IM

'rhis flag indicates timing errors.

O'lT

This lamp reflects tho state of the OECt~pe
flag • (011 indicates an operation completod).

OF

The Data Flag i~ set when tho controller needs
to transfer a data I"ord through the thra -cycle
break.

WC

The Word Count (lag is zeroed whenever the word
count register overflows.

U+M

This i.. the output of the up to speed delay.
When tho light i8 on it indicatos that th~ tapo
is not yet up to speed.

i\

I

g'

i~

.""! .g
...
r,..

~~

i

«I
10<

....
w
:s

~

<1.1

~~

;'

+I

tI

i\}«

1

QI

~

fo<

101

~

.>I.

CJ

:I!

!

~

~
(!j

...

CW

11/

I~ ~
i 1

_" .......

IIJ

'5
;'

.>I.
U

--

~Fl'-e-~

-

-

II'l

f:

I

~

~

,~
~

Vl

~

....

~

'<
Q

~3

If)

to

~t.

~~

~

.at!
! ~

~!

I4

':)

IG

r
L

0

l:i

'1/111

t~
~~

~i

RlV

NUMBER

,cel!

".'OIJ

OIC 'OItM NO
ON. tOI

.r'.

8M!!T _'_'_ 0'

..t.Ji!..

1'~f.1 C~~~II

HUMDt"

,\l.I-' .....

PEe FORM NO

SHEET

nllA 10!!",

a~Dama

ENGINEERING SPECIFICATION
TITLE

0

ta~nca

ENGINEERING SPECIFICATION

CONTINUATION SHEET

Te08 Speclflcatlon

'1'abl('

---

'l'ho rd.ngln 8wildl, WH'l'M/NOHMAtJ,

cllld an array of light "I
the IIpl'lIi\\pr flf til(' 'reoo eOl'\trollt'l.'
lHWd concert! hilnsclf.
'I'ho operation of the transports
1\1.'6

all. with

NAME

is cxphllned in thoir ): C'sp('etiv(' manuals. Tho
'l'COS swth:'1 (locntcd on ·~hl..! left-han:! side of the
loglC panel) puts the contro11('r 1n wrlte timlng and
mark track mode or else in normal, or everv other mode,
depending on the settings, SW'fM or NORMAL r(>spoctivE"1.y.
Table 1 -6 cummarizes the function of each indicator.
Table 1

-

6

lNDICATOR

The

Indicat~r

.... ~_..,....... ..

INI.HCA'l'OI\

whi~'h

-

Er

Panol

USR

The Unit Select R<'gister which sp<'r.!ifies
which transport i~ to be activatc~.

MR

Tho Motion ~(!9bter specifies the three
possible movements of the reol.

FR

This four-bit !'unction Regitlter speocifiol'l Ollt'
of c<'veral possible operations in either of

fORM "'0 '.-Ion

ORA 101

~"............ :>I;"""~~

~--.

""~

'J. 2':..,.:1

~'::::t -"'<=~

-"'-'"

--

INDICA'l'OR F'\JNCTI0N
This flag lS set if anyone of the flV" followlng
error flags come up. Tpesc conditlons stop
transport motion. except for the parlty error
of bit 4, and all cause a program lnterrupt if
the f,cility is enabled.
output from the mark track instructlon
roqlstrr iq te~ted every tlme an in~truC'tlon
If no inslrurtion a~prars, this
OP1H'tllU.
indicatl''J that tho mark tr~t'k h not rt~C'or(l"rl
properly anu thorefon~ an error has occurred.
MK and th"rofor(' f:l' arc R0t.

END

1 f ttl(' instruction rngilltt"l' of th.~ mark traCK
dc('odos un ('nd .:onc incl lca tor. this flag and
IT aro /lC't. A l'Iub!l0qul'nt pl"oqram intorrupt
atitnulatC's the computC'r to determine the cause
of the lntC'rrupt.

SF:

'l'hiB fl1\CJ Inrrnr~ whon rnntro}
at..ltC'. and Statull A function states aro
r0mpAfNl i\nl1 fn\lnc'\ j TW(ln('PI(l\l~.

----

tnnblo the il'lterrupt whon on indicatoR that
the cont-roller elln cauoo a progrllm intorrupt
whon nn t'rror fhg or tho or:Ctap<, flag hI
Sl!'t.

'1'his ('rl'\1' Of'curn if tli(' lOl1gitudlna1 paritr
b\lf4'('l' flhow'> im (,l'rot' at the l'nd of 1'1 blo...·]t; d\lring
a road data function.

-

IS~E
otc

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

Th~

liAR

L

(,

mdtdl

two l\\odf'!!I.

!!:NI

-

MK

INDICM'OR FUNc'rrON

NAME

1

OF .~

.----- --

TITLE 1C08 Sprcificatlon

'I'COS Operator Controls and Indicators

..::L

CONriNUAT10N SHEET

-~

1.3

Rtv

":'

le::EI

NUMBER
,ccf,

~

<) "

I

IS~E I:~~EI

REV

-

DEC fORM NO 11- '()11
OIlA It'll

NlIMB£R
\ ... c~ -..; -.J
,...

~

I

REV

..

TITLE TCOB Specification

'l'ablo

1

-

TITLE 'I'con

--

I

UTI

This Up-to-Speed flip-flop is set as 800n !lS the
tIlpe t\:'a"lIport ralchea In accephbll$ I!Ipflfld.

\If

Thia t'1.~, when
are onabled.

a~t,

I

'l'hils mOOM tho sW'rM/NORM1I.I ••wi tch h
tittlit'l11 and mark track modo (SW'l'M).

~n

Th~fta

STATE

These bits make up the state generator, a ring
counter, which steps from an Ldle ~tate through
fivo other states and back to idle, a~ a block
passes tho tape heads.

SHE£T

mmaDma

F

-

BH

The Window Register is a simple shift teglster
which receives the instt"tlot!nn (,'Q(k~ frOlIl ttw
l1\ark trJ.ck ar.d u~cs the codos to cet the State
Generator.

:

I

I

It~

..1Z..

OF

NUMBER

REV

..s....

"tee,", -v
DEC FOAM NO 'IS-'''II
ORA IDe

SHEET

ENGINEERING SPECIFICATION

CONTINUATION SHt.ET

'l'C08

D

l

OF

51

CONTINUATION SHEET

,

Tho following is on ('xample of progr<1mming the 'l'COS.
'I'he program l.'3 wr1tten 1n PDP-8 Assembler languages.
Problem I Find
number lS 3.

810ck Hark is the first bl.t to which the state
generator moves. It is sot wh~n forward
block makr is in the data buffer.

SRCIt,
The Reverse CheCKSum state oecurs wh~n the
Reverse pec MarK cell is er.counter~d.

Th~ Data State stal'ts with the first blOCK that
contains data (Tho Reverse Final Mark) and
finishes wh~n the ncxt-to-l~st data block (tho
profinal Mark) Passos the road h~ads.)

given block, number 5.

a

INSTRUCTION

rJ
ION
CLA
TAD
DTeA
D'I'XA
JMP I

Tne transport

REMARKS
/Turn on PI
/Statu8 A code for search,etc
/C1Nlr StatuA A
/Load Status A
/Roturn

3614

SRCI:I

1,
F

CK

The FLnal State occurs during the last cell
which contalns data (the Final Mark.)

TAPE,

CI~

,\1.0
SZJ\

I

NUMBER

'c:.CI> "".,d

..lL

/Error, DEC tape flag was not
set. Another systt'm flag
caused the PI

JII'RB
DCA 'rf}olp

-

SHEET

/Skip on flag

M'S~

JMP + 2
.7MB TAPE
HLT

I

The idle stat(!.

IS~E 1~~~El
DtC .011. NO 11-1",1

FLAG

The Checksum State occurs when the pce Mark
cell p~sse9 the heads. Durmg this state,
the checksum iE depositpd in thp pce Mark, if
thn TCOS is writing, lt ~h~ck9 fer a parity
error, if tho TCOS 1S in a read operation.

I

1

Dn4101

.(~'!!

...1:L

Speclficatlon

TAG
ftC

tlw flip-flope which t'vn!!t1tut~ the
th~ timing generator.

of

'I'hese lights r ... flect the statesof tho 12-oit

WOTCATOR rtJNCTTON

NAME

I

.~

IH"O

6

6rCATOR

I

ThOll"

I

TITLE

1

CO, Cl

a thrue-bit switched
tail counter composed of bits MeoO, HeOl, MC02.

WINDOW

Speci fication
Table

The!'!e thrN' bitH r~prf'.(jnt

I------------------------~

NUMBER

·v'r,

DIC '0". NO
nAt flU11.

ENGINEERING SPECIFICATION

MC

1------------------------------,-------------__________

!

LP8

IS~f.I~~?f.l

6

OECtapfI bllffN.'.

writt}

state of the

th~

-

!NDTCA'l'OR FUNC1'TON

v'm

I
I

nix indiCAtors rerl~ct
Longitudinal Parity Buffer.

1

NAME

c~unt~r9

i

TITLE TCOS

iOIl

JN~lCA'~---------------'~------~--~------~--------;

indicates that the writer!
~

Wl'M

CONTINUATION SHEET

I

rND'ICA'1'OR r'UNC'l'ION

NAME

13pori fiC'11

'rAble

6
I

ItmrCATOR

,-

ENGINEERING SPECIFICATION

CONTINUATION SHEET

OF

0001

LILT
etA
'l'AD
A.'l0
f>ZA
JMP
JMP

•
'l'f;~P

1000

ERROR
BLKNO

/Rond ~tatuf1 B
/Storo It. <.Iway
/MasK for flnc;
/Flag is on
INO flag - something wrong
/Rcturn status B
/Test for error flag
/Go to error subroutl.ne
/GO to subroutl.ne to get blOCK

REV

5cJ

DEC 'ORM NO 'IS-lOll
ORA 101

SHEET

.!:!..L.

OF ~

ENGINEERING SPECIFICATION

ENGINEERING SPECIFICATION

CONTINUATION SHEET

TITLE

TC08 Speciflcation

TITLE

BLKNO,

CLA
TAD I CA
TAD 7773
SNA
JMS WRT
CLA
TAD 5
CIA
TAD :i: CA
CIA
DCA WC
CLA
TAD 0100
DTXA
ION
JMP 1 SRCH

CONTtNUATtON SHEET

TCOS Spccitlcatlon

1.6.1

/Get block number
/Tcst for block '>
/This is block 5-start writl.n
/Not block 5
/Get a 5
/Make 2' s compliment of 5
/Add pr~sent block
12's cOmpliment it
IPut result in WC

Delays and clock
1. 6. 1. 1

The pos ts on the G888 readt~r wrl tors
should ~ be adJusted. They are pre-set
1n Module Productlon.

1.6.1.2

Set the XSTA Dy to 5 us. ThlS delay will
be ~rlggered by the folloW1IIg program:
.llil~'§'

1)000
0001
0002

IGet next Status A
/X'OR lnto Status A, CM
ITurn PI
IGo back to main program

IN~~

~~

7604

LOdd AC from 5R
Load 3tatu!.> A
Jump to Zero

6766

5000

The output of the delay ~b on p1.n D18T2.
Adjust the bottom pot of the M302 1.n
016 so that t~e output sl~nal has ~
posltlve durat10n of 5 m1croseconds.

1.6.2

1.6.1.3

The Status A reglster car. also be
tested w1th th1S program. By plac1ng
the data sWltches to A "1", the
correspondlng Status A bits will be set
to A "I".

1.6.1.4

To check tape motion, set switches 0,
1, and 2 to select a lransport and J
and 4 to determlJlc direction and motion.

Sotti~q

1.6.2.1

the Clock
The M401 clock will be cnat-led by the
fo1\owlng procedure. Do not atte~pt
to ground any slgnals wlth Jumps: or
modules may be destroyed. Toggle In
the followlng prograM.

NUMBER

..

'.-'(1;';

DEC fOR .. NO
DIIA loa

ENGINEERING SPECIFICATION
TITLE

Te08 SPCCl.flcatlon
1.5

..!:!L

SHEET

CONTINUATION

OF

DEC 'ORM NO
ORA toe

StJ

\c.I:~ ·v-.r~

'.-'D11

SHEET

ENGINEERING· SPECIFICATION

~HE!T

0000
0001
0002
0003
0004

of two fl,ountlnq ..,anels of M 'wrl('S
10'1 1 <:, an tll 51' Dy is on pin D14/1Z.
AdjuBt the botlom pot on the M307 and D14
for a posltive signal with a duratlon of
70 micro'l~\'onds on this pin.

Cross Talk Delays
1.6.5.1

f-o--.

----- -

L~ad th~

1. 6.4.1

4

3

1.6.3.1

Power

1

------

The Unit or Motion Delay

Dissipation

1

Ole fOlIM 1110 .I-Iltll
OR'loa

SHEET

Power Re'luil;'cments
1.6.3

4

£L

T;\e output of the ClOCK is on pln D1502.
AdJust the pot on the M40l 1n Dl~ so that
~he pulse reprctlt10n rate at this pin
is 8.~3 micro~econds.

Table 1-7 luts thE' primary power requir(>!ONlts
for a DECtolPC system.

I

OF

Rf'loove the tape from the transport and
place It on 11ne wr1tp. enable. Turn
the sWltch WRTWNORMAL to WRTM. Set
the data sWltchf's 4, 5, 6 and 7 to a
one (1): h1t Load Address and start. A
WRTM functlon w1ll be executed on unlt
elght (8), and the clock wl11 run.

The OECtape

1.5.3

CONTI~'UATION

lNS~

Hardware
T\w TeOH

..!t.:L

REV

~T_I_TL_E___T_C~0_8~s~p~e~C_l~f_l~c~a_t_l~o_n____________________________________________ _____

Equlpmcnt OeSCrtptlon
1. 5.1

I

NUMBER

v·y'..I

~c.(";.

"c...:-;-.t,;I
DEC 'O"M 1110
ORA IU'

t.~,on

SHEET

,~

..!:!.::L

OF

_£P_

ENGINEERING SPECIFICATION

CONTINUATION SHEET
TlTLI

1.6.5.2

1.7

TeOS Rpecification

TITlE

Te08 Specification
Tho TPl XTLK Dy output is at pin A14T2.
Adjust the b?ttom pot of the M302 in
location A14 so that this pin glves a
posltive signal with a duration of 10
microseconds.

..

CONTINUATION SHEET

Table 1-9 Summary of Functions

IFUNCTION

Summary of Statlstics

NORM.~L

MODE (NM)

CON'l'INIJOUS MODE (CM)

Tho following tables summarize the errors, functions, ~la9s and critical timinn specifications
of a DECtape system.

I

~.

Table 1-8 Summary of Errors

Move

No Interrupt
CA*, Ignored
WC** I Ignored

Same as NM

DTF: Interrupt at each

DTr: Interrupt at each

~rF'

1. Search

block mark
--r-UN-c-T-I-O-N----'----E-RR-o-R-(~I-N-N-O-RMA-":"L~OR:--C~O~N1'~I~~U~(\:':"U~S-M~O~D:-::E~)--1

toJo incremented
rncr~mented at
each blocl~ mark

CAl

we,
Move

Select Error
EOT·

Search

Select Error
EOT*
'fiminq Error
Ml< TRK Error

~. Read

DTF, Interrupt at end

of each bloc.k

DatA

Select
EOT*
'l'lming
Parity
Ml< TR1<

Read Data

,

CAl InC'rement.cd at
each word transfer
WCI Incremented at
each word transfer

I

Error
3. Read

Error
ErrOr
Error

Read All

Select Error
EOT*
Ti,."inq Error
Ml< TRK Error

Iwrite Data

Select Error
EOT*
Tlming Error
Ml< TRK Et'ror

1

r'

J)1'1"1

All
CAl

Interrupt at cach
word tranafer
Inorementcd at each
word transf(>1'

block m~rK if ~C has
overflowed
Not incremented
Incremc!nted at each
bloC'k mark

CAl

WAt

DTFI Interrupt at end of

block If we has
overflowl'd.
CAl Incremented at
each word transfer
WC: Increl1ented at each
word transfl'r.

IYIt', Interrupt at WC
~AI

overflow
Incremented at each
word transfer.
I

-End of Tape

...

o[e '01111 ..0
ORA totA

ENGINEERING SPECIFICATfON
TITLE

TC08

Speclficatlon

IS~E IC~~El
SHEET

..!t.:5.

DEC FORM NO "-Ion

OF ~

ORA 101

ENGINEERING SPECIFICATION

CONTINUATION bHE&!T

TITLE

TC08

I

NUMBER
REV
,<-v.' '" .> ~
SHEET .£!l. OF .5£

CONTINUATION ShEET

Spcclilcatlon

'l'aLIe 1-9

Table I-f{

lo'ttt-.C'I'lON

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

..

~"Ne,',ON

j

EH,!{OH (IN NOll./,·AL OR CONTINtlOUS 1>10D£)

I

_----------

I

NORMAL MODE (NM)

Incremented at each
word tJ:dnsfcr

we,

\

Write All.

:

Select Error

\4.

Write

5.

Write

CON'l'lNUOUS MODE (CHI

WCI

Incremented at each
,",ord lransfer

Same as 2.

Same as Read Data

Same

Same

Data

EOT*
Timlng Error
MK

i

TkK l'!t:ror

I

lb.

I
I

Scleet trror

& Mark Traoks

Timing Error

Slime as !lend 1\11

Mark

tlnullcd,,·1t

*Current 1\ddress (CA) 15 in location 77~1
"Word Count (\'1e) is In locat~on 77 c O
·**If u~pd hy rnIRt~ke. thu control qlv~u 0

I

Sul~~t

!

-

OIlA lUI

Read All

I

*End of tapti

I

t.~r. (~o~t:1

~s

'l'rackel

7.

ole '01111 NO "~'''n

Write l'Flme as 3.
'riming
Ii<

I

Wrih Tillliht;J

fl9 3,

1\11

,

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ENGINEERING SPECIFICATION
TITLE

Tena

ENGINEERING SPECIFICATION

CONTINUATION SHEET

TITLE

Spec1ficatlon

Table

1

-

10

TIME

Table 1-10

microseco~ds

Ti.1De to answer data channel
request

Up to 33

Wor& Transfer Rate

1 12-blt ~~rd every :33
microseconds

OPEP.ATIO~

OTF to beg1nnlng of next data

OO'F Occurrer.ce:

Start T1Zlle

375 mill!seconds

(~2~)

Stop Tune

375 m1lliseconds

(~ 2~~)

TLrn Around Time

375 ml1liseconds

(~ 2~)

Search - Read Data Functl.on
cha~ge for present
block

Up to 400 m1croseconds

I
I

Search - Write Data Functl.C'ln
change for present
block

I

Read

- Search Functl.on change
fer next block number

Up

Write

- Search Functlcn change
for next block number

Up to 1000 m1croseconds

---

-

Up to

~o

Read All: ~"M
Wrl.te All:
!~
Wrlte T1ming & Mark Tracks:

Never
Every 54 m1111seconds
(we) X53 mll11seconds
(No. of blocks)
X53 m1111seconds

I

I
i

Every 33 nlcroseconds

I

NM

Read All:
CM
Wrlte All: CM
Wrlte TlmLng & Mark Tracks: eM

1000 microseconds

(we) 33 ml.croseconds

-------------------------

I

NUMBER

ORAt08

Move: !;:M. eM
Search:
~~1
Read Data: M
Wrlte Data: ~""M
Search: eM
Read Da ta: O~
Wr1te Data: CM

400 m1corseconds

,CCT -_
OEC fOR. NO '5-'022

1.7 Jlllillseconds

plock

1 129 Block every 25
mil I 1seconds

I

Te08 Sp€c1flcatlon

Summary of TunUlg

OPERATrO~l

I

CONTINUATION SHEET

SHEET

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NUMBER

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DEC FORM NO '6-'022
ORA t08

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