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CSGAS-70 

• 

IBPARrMDr OF Tm: ARMY 

BA~ ABM! SECURITY AGEICY 

VASBilarol 25, D. C. 

SUBCOMMITTEE REPOm' mo. 21 

~ FOB TD Amil' SECURITY AG'lmC! TEClmICAL ~ 

14 February 1949 

Subject: Initiation ot Pro3ect 29-70..,004, J.S'AF 1, Classification 

aa to TJPe, and Assigmllent ot .Priwi ty Thereto 

0 

1. .REFERDCE: 

IRS frcm Chief, Operations Division to Chief, Research and .Developmsnt 

Division, dated 13 August 1948, Subject: Teletype 'ra:pe Comparator. 

2. DlSCtl3SIOB: 

a. 5anciea Concerned: 

(l) Copiu.nt Agenc;y: );ray Socurity Jlgency 

(2) Directing Agency: Army Security Agency 

(3) Requssting Agency: A:rmy Security Agency 

(4) Participating Age~y: None 

(5) CoorcU~t1ne Aeency: 1'aV7 

(6) other F~t0bable Interested Agencies: mD" 

b. ~oae: 

To develop a teletype tape comparator for CSGAS ... 90. The equipment 

will be built for general crn>tanalytic problems and will be used. in com.paring 

wo telet;n>e tapes. 

c. Deacripti~~ 

Tb.is equit>m&Dt Will CODsiat of a high speed dual tape drive, photoelectric sensing mechanism, memory mechanism for storilDg baud inf'ormatim, combming 

and comparison circuits, translating mechanism for tnmel.ating 6 be.ms into 

one Of 64 characters, electronic counters, intercmmectingplugboe.rds, and a pridier 

for recordiDg the out-put reaul.ts. 

d. Related Material: 

ea DevelOJ)lll!!lt llistoq and Status: 

An experil!QDtal. model Of the JSA7 l equipment bas been built to prme 

tbs theory possible. '!'his uork has been done, under Proci1ect 29 .. 70 ... 001, Applica 0 

ticn Cf Electronics to CeyptoloSJ. Declassified and approved for release 

PY NSA on 08-07-2013 pursuant to E.O. 

COPJFJDENTIAL 13526 
• 

t . !)oripoeed i>a'f'e lOP!!.,llt! 

(l) The pzoopoeei clevelapmsnt vill ccmaist or·t~ tolltmix>S pbaaes: 

{a) Further research atuq 

(b) Continued 't$ste and development at present experimental 

model. 

(c) Constncticn at three service test models. 

(cl) Development will. be comuctacl at Arlrq Security Apncy. 

(2) Tlrr"es serrice t«Pet JllOClels will be ~!reel. The seniee 

teats vill be conducted by CSGAS-70 and 90. 

(3) The aeaignment_of a i ... c priority to thie pro.:Ject is racOUDend6Jd, within the terms at Paragraph 3a(2)(c) of War De-partmnt 

Circular 71, 18 H!w,eh 1°947, be,..l'·'USe ct ita intenaed operational 

use. 

(4) The estimated cost of this project is $65,000. 

(5) It ie estimated that the B&·velcpm&m; will be initiated upon 

a})proval and completed 18 months tbereatter. 

B• !!,curit1 Classif'ication: 

(1) Tha equipment ~ill be eleaeif'iea Confidential. 

(2) This equi'PlllEmt will be considered in the "limited" catsgox•y .. 

(3) OrJPtographic clearancra will not be re,ui ~sd for pal?'SCDml 

ccmcernecl in the dne lopm:Dnt. · 

The Subconmittae rec01.llllltmCis tbat P.rcjsct 29-70-004.11 ISA'I l, be 

e11tablishad~ claei11ified u D&velopmell'lt Type, Sel'TiCe Teat T1P&.11 an& asraigmd e. 

priori t:y of l..C.. · 

4. EIBIBITS: · 

Militarf Cbl!.racteristics 

5.. COOIU>Dlti'?l:Ol!: 

Cooi"lll.inationi wa acoompli1111hed Yith the fcllcwimg .agencies: 

l lnc'll.o 

lbthibit "A" 

me> BOBB 

Cbairlll&D, Cieyptolcsic 

Subcommittee, ASATC 

CONF!DENTlAt 
• 

EXBIBIT "A'' 

Proposed M111'tar7 Cttan.cteriatica tor the PSl3 l 

I. General Intornation 

A. Obj!ct1Te (Operational B.egu:lremsnt) 

. Tb.ere is a m1Utar1 regu1rement tor a &.vice vhich vill compare 

an4 analyze data tram teletype tape &t a hiBb rate at speed. 

B. hnct1onal Cbaracteriatica 

The 4evtoe aball: 

lo J>r1Te two HftD level telatJpe tapes in 8JllChrOD1Blll1 and read 

tba 1Dfoa:'llBt.1on frm 'both tapes b7 means of photoelectric readers at the rate or 

5000 characters Jar aeccnd. 

2. Store thia 1nf'crmat1on tor a length of f'i'fe characters from 

each tape. 

3. Compare the etora4 1ntomat1on in "farious 'combinations tor 

co1nc1dence or non-co1nc1deuee. compal'ing as 1ncli'1'1dual unite or as sums or 

differences. 

4. Pr0'9'1de elnen electronic counter• (capa.cit7 0000-9999) fer 

counting the oatputs or the coinc1denee circuits. 

5D Pro'v1de tvc 6/9' tre.ulatara for tbe output of tvo, and 

circuits :For·compatins and 8lJ&lJ'z1DS the output at the two tramlatcra. 

6. Have available a set at svitchea vhicbwill be the equi"alent 

ot arJe I.eve 1 at a compare:t1ve1.J sbart third tape. 

7. Prar1de a maximum ot plugg1Dg tac111t1ee to increase the 

T81'88t111 t7 ct the device. 

8. Be ca}l8ble at ut111zine the dig1 tal recorder now under 

dnelopment or other ra.p1d means of recording the reed11188 on tbe counters. 

c. Tenetat1ve TeobnicalConaideratiOIDS 

1. General: 

With the exception or the input 8Jld. output meehaniams, the 

equipaent shall be completely else'tronio. A combination at Yaouum tubes and. 

t!Qratrans shall be uaed to make up the tubs complement. 

CONFiD6NTIAL 
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2. • lnpmt. 

fte input a!lallbe from a mechanical tape drive which ie 

under cleTelopDBDt at tbe pJNJaent time. 

3. Oa.tput 

It ia propose4 that the output be piat into tbe 41ai tal 

rec0l"4er which 1e nov llDClel' development. FCJJt sreater Teraatil1t7 an attempt ' 

ab&ll be mde to use IBM recol'tilJ8 equ1pmeat:!Jt'tbe event that a aat1atact0l7 

digital recorder ia not completed. 

~. Counters 

The chief' tecJ:mical problem at the present tims is to develop 

a aat1afactorJ counter vhich vill bave long operational lif'e alli be capable 

ot Clr1•1ns tbs reco~1D@ mecbaniem. 

D. Tm ot Installation .... 

Thia equipment shall be deaigned ae a f'ixec1l iutallation. 

B. Proposed General LoeatiO!l, of Equip!!!! 

Jle8aqurtera, Art41 Securi t7 "8eDD7 

'I'. 0I.1m1tins Ve1g!!t and Volume Factors 

'.rbeae factOr& are not critical; hOS"&ver, the vol.wle aball be 

kept as Bllall,as poaeible. 

" 

G. l>es1rable Lite !xpactency of Equipent t:Jith Reuaaable MainteD&Dce 

5 Yeara .. 

II. Pel"f'Ol"llBDCeBequ1remente 

A. +ccurac1 

'?he equipment 1111.lst be l~ accurate vhila it is in operation. 

B. Breakclown T1• 

Egu1pment shall be desisned- so all parte are interchanaeable to 

miDimize dela18 due to breakdowns. 

c. l'l.G1bil1 t1 

See Section I, Parasrat>b. B (7) a 

CONFIDENTIAL 
Ill. Operation • &Dd Maintenance COlll814ent1m:as 

A. 9ferat5 Time . 

The equipmmt &ball be ctes1gnad tor oontinuou use; hovfift', it 

ia expected lihat it will be operatecl about eight houra per aa,. 

J .. !!umber of ()peratora and BSt1matea·SJrill and 1fumber ot Maintenance 

PereOIJl'lel. 

l. Operators: 

One seti-aldlle4 per machine. 

2. Maintanance: 

The equipment v111 'be •intainecl 'bJ replar 1abon.tcr1 

peraonnel with complete laborator7 test equipmmt. 

c. Prov1ei0118 tor J'ield Ma1ntcmance 

See :far Ill B(2). 

IY. P'i11aica.l Charactenatics 

A. !'over Reguiremnta 

' 

. '!'he equipment aball operate :frail the regular ac pover U.ma (117 

.,olta ~ l~, 60 c10lea). . 

B. .A4aptabilit1 t() Modit:lcation 

. . 

The e4uipment shall be essil1 modi.ti·"""- tor use on 81l7 priobl.em 

1D ita seneral field. 

c. !uMednese, Tempera.ture :1%tre•14. Ventilation, Bumtclitz2 Pressure e~c. ' 

Sball be capable ot operating in a roomv1tb controlled humiclity 

and temperature. ft& temperature 1fill var1 betve~ 75<>.r anc1 850J' and the 

hum1c11t7 between 50 and 6°" .. 

D. !9.ui)!!!t Am!!plll8Dt for Operators Bttic1enc1 imd Comfort I 

As ett1oient aa poaaible ccn111atant v1tb. flmctional charaoter1etice. 

B. ~l Teat !ctuipent. 

Tube tester am teat csc1lloaecpe aball be bllilt into equipmsnt. 

P.. Transportabill t1 and Arq spcial Paelryil!g &9uinenta ... 

Air tramportatib1Uit1 is not requ1re4 or dea1recl. Ho special pao~ requiremante o · 

c.· Deetl"UCticm Reguiremmta 

Bo special meana at aeetructicn requ1red. 

CONflDENTIAt.