SIMPLIFICATION OF (SANITIZED)CHARACTER MATRIX

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03535A002000010027-8
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 2
• Document Creation Date: December 23, 2016
• Document Release Date: December 4, 2013
• Sequence Number: 27
• Publication Date: April 14, 1959
• Content Type: MEMO

Declassified in Part - Sanitized Copy Approved for Release 2013/12/04 : CIA-RDP78-03535A002000010027:8
FIELD DOCUMENT ROUTING AND ACTION RECORD
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in the proper column. The last routing on this sheet shall be the unit in which the basic document is to be filed.
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sure proper control clearances. THIS DOCUMENT ROUTING AND ACTION RECORD IS TO REMAIN ATTACHED TO THE BASIC RECORD
DOCUMENT AS A PERMANENT RECORD.
FROM DOCUMENT SYMBOL AND NUMBER
R&D Laboratory
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2.
LOCATION
2815
Alcott
Hall
DOCUMENT DATE
DATE
FORW DED
OFFICER
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5.
R&D Lab
6.
ACTION SUSPENSE DATE
COMMENTS
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DOCUMENT PROCESSING DATA
INDEXED
14.
ABSTRACTED
FILE NUMBER
FORM NO.
861 SECRET CONFIDENTIAL UNCLASSIFIED
1 DEC 55 (40)
Declassified in Part - Sanitized Copy Approved for Release 2013/12/04: CIA-RDP78-03535A002000010027-8
Declassified in Part - Sanitized Copy Approved for Release 2013/12/04: CIA-RDP78-03535A002000010027-8
? ?
Office Memorandum ? UNITED STATES GOVERNMENT
TO : The Files
FROM :
SUBJECT: Simplification of
Character Matrix
DATE: 14 April 1959
1. A reassessment of the problem of code generation in the
Portable has indicated that without any
circuit modifications the character matrix in the keyer can be re-
duced from a total of 26 ferrite memory cores to 4 ferrite memory
cores of the same type. At the same time the number of turns of
#40 wire in the matrix would be reduced from 546 turns to 112 turns.
The volume of the matrix would be reduced to 1/12 its present value.
2. The new matrix would take about 1/5 as long to wire as the
old matrix, and with the reduction in the number of perations
involving the hair-fine wire, the construction of the hole
is made considerably more attractive. The thickness o t
package could be reduced by 1/16 to 1/8 of an inch if this
used on all future models.
3. If some further developmental time can be allotted to this
project before any future units are produced, the possibility of
using four tape-wound bobbin cores in place of the four ferrite
cores should be investigated. At least one transistor may thereby
be eliminated, and operating margins improved.
4. It was previously stated that, in order to adapt the
to a full 32-key letters-plus-figures standard teletype capability,
one clock could be eliminated from the circuit and the character
matrix expanded by a factor of three. With the new character matrix,
however, the same clock could be eliminated and a total of only five
cores used in the matrix. No significant circuit modifications would
have to be made in eliminating the clock; of course, sufficient case
area must be provided for the keyboard.
DOCU%?!;-.7-77
NO
0
.20/0
AUTH:
DATE: 9
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- Declassified in Part - Sanitized Copy Approved for Release 2013/12/04: CIA-RDP78-03535A002000010027-8