VISUAL READOUT DEVICE (REF. TI PROPOSAL)

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03535A002000010045-8
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 4
• Document Creation Date: December 23, 2016
• Document Release Date: December 4, 2013
• Sequence Number: 45
• Publication Date: May 10, 1960
• Content Type: MEMO

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Declassified in Part - Sanitized Copy Approved for Release 2013/12/04:
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Declassified in Part - Sanitized Copy Approved for -Release 2013/12/04: CIA-RDP78-03535A002000010045-8
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Office Memorandum ? UNITED STATES GOVERNMENT
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FROM :
SUBJECT: Visual Readout Device (Ref. TI Proposal)
DATE: 10 May 1960
1. The coincident current memory _ development
has been confined to approaches which would not preclude use of
as a receiving and readout device, should it later be
desirable to develop a companion unit containing the necessary
binary-to-unit decimal conversion matrix and lamps or other
-(mechanical) indicators, as well as circuitry, such as an 850-
cycle filter, for interconnecting the receiver and keyer unit.
2. The as it now stands contains all the
functional circuitry represented by flip-flops 1-7, start-stop
gate, schmitt trigger, and clock, in Figure 2 of the TI proposal.
Outputs for the information transfer gate and flip-flops 8-12,
contained in the companion device, are available with a choice
of amplitudes and impedance levels. With consideration of de-
tails such as our almost exclusive use of pulse binary devices,
such as cores, in preference to DC binary devices, such as flip-
flops, the off-line keyer could be made to replace directly the
boxes named.
3. The only advantage of using the and a
companion unit for visual readout, instead of an equipment such
as proposed by TI, seems to be leisured copy by the operator. The
setup would yield one character each time the advance 50X1
button is pressed, the character being lighted for as long as the
button is held. Releasing and pressing again would yield the fol-
lowing character. Since the memory is non-destructive, repeated
copy would be possible until the message was deliberately erased.
Transportation with power off does not destroy the message.
50X1
50X1
50X1 ,
50X1
50X1
4. All keyer circuitry now in its final form is "stressed" for
1600 wpm transmission in the event this will become a requirement.
Although 1600 wpm reception would be restricted to (a) sped-up
baudot characters over routes in which multipath is not a problem,
or (b) special models resulting from a separate development program
to adapt the keyer circuit for reception of synchronous non-baudot
characters, it could be thought of as an attribute that the off-line
keyer can be made to accommodate 1600 wpm messages, when used as a
readout device.
DOCUMENT
NO CHANGE r-.1
DEC
CLASS. 13: TS S C
NE--XT REV;EW CATLE: 40/0
CONFIDENT I AL AUTH: HR 70-2
DATE: REVIEWER:404.30=VO
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Declassified in Part - Sanitized Copy Approved for Release 2013/12/04 : CIA-RDP78-03535A002000010045-8
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5. Here are some specific differences between the method
of operation of the in the receive mode and the
method proposed by TI.
a. The clock used in the is a silicon unijunction
relaxation oscillator with an expected over-all sta-
bility of 27. The circuit is arranged so that in all
operating modes, but specifically in receive, an 11
Msec delay (at 60 wpm) exists between excitation and
first firing. In this respect it is identical to the
clock shown in the TI proposal. However, an option
has been provided whereby the clock will not fire
unless the input actually remains in the SPACE state
for a total of about 11 Msec. This adds greatly to
noise discrimination, but assumes rectangularity such
as would be provided by the 850 cy filter described.
After initial firing, only the input state at the time
of strobing is of interest, since the clock continues
to fire for seven pulses in all before being returned
to the initial state. The above option is not a re-
quirement.
b. The function switch on th unit contains a
RECEIVE and a COPY position n addition to TYPE,
SEND, and BACKSPACE. The incoming message is stored
in the RECEIVE position. In case noise or operating
procedures may have caused bogus triggering and par-
tial depletion of memory capacity, a RESET button,
if pressed just prior to start of actual message, re-
turns the keyer circuitry instantly to the first mem-
ory address, permitting full use of the three 40-group
bays. To copy the message, the function switch is
turned to COPY. The same button, which under one plan
rotates with the knob of the function switch, is now
used to ADVANCE the memory one address at a time. A
message is received in three 40-group sections. Dura-
tion of message is indicated by a flashing light. The
operator must move the bay selector switch to a new bay
between sections, and press the RESET button once. The
sections may be copied in the order received.
c. During COPY, the output from the unit to the com-
panion unit consists of pulses on rive wires to the
five flip-flops of the parallel storage register. The
function of the information transfer gate of the TI
proposal is performed at the time the message is re-
ceived. The five flip-flops can receive their informa-
tion (pulse/absence of pulse) simultaneously or 22 Msec
apart, as desired. Both types of output have already
been provided.
50X1
50X1
50X1
50X1
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6. The operating breadboard now contains all functional
circuitry plus one 40-group bay. A test of receiving opera-
tion is not scheduled since no requirement exists and it is
desirable not to delay demonstration of a complete prototype
with TYPE and SEND capability. Subsequent completion of all
other operation modes will not be difficult, since by and
large the circuitry operates in an identical manner
for all.
50X1
50X1
Declassified in Part - Sanitized Copy Approved for Release 2013/12/04: CIA-RDP78-03535A002000010045-8