SUBMITTAL OF REVISION TO DUAL FORMAT DATA BLOCK READER

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP79B00873A001800020021-1
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 4
• Document Creation Date: December 28, 2016
• Document Release Date: October 24, 2012
• Sequence Number: 21
• Publication Date: June 11, 1971
• Content Type: MEMO

Declassified in Part - Sanitized Copy Approved for Release 2012/10/24: CIA-RDP79B00873AO01800020021-1
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CONFIDENTIAL
11 June 1.971
Submittal of Revision to Dual `Fermat Data Block Reader
(a) Verbal discussion, between customer and dated 25X1
9 June 1971
Enclosure: (1) One (1) copy of. Dual Formal Data Block Reader Proposal
No. ED-CX-14, Rev. 2 dated 6 /11 /71
(2) One (1) copy of Detail Cost Breakdown
In accordance with the discussion of reference (a) we are pleased to submit
enclosure (1) addendum to the duaf format data block reader proposal, previously
submitted on 17 May 1971.
Enclosure (2) is the price increase of attributable to this change. 25X1
This price increase applies to both'Option "'All. and "B" of the May 17, 1971
proposal. The change will have no effect on the program period of performance
previously quoted.
This quotation may be considered firm for a period of ninety .(90) days.
If any questions should arise concorning'the above matter please do not hesitate
to call or write tkie undersigned ati 25X1
Very truly yours,
CO~JFlDfNiIRL
Declassified in Part - Sanitized Copy Approved for Release 2012/10/24: CIA-RDP79B00873AO01800020021-1
 Declassified in Part - Sanitized Copy Approved for Release 2012/10/24: CIA-RDP79B00873A001800020021-1
DUAL FORMAT DATA BLOCK READER
Proposal No. ED-CX-14 Rev. 2
01-
1. Purpose
The. purpose of this amendment is to modify the performance
requirements of the Dual Format Data Block Reader resulting from
changes in the format of the data blocks.
2. New Data Block Format
Each of the two formats will comprise of either 5 or 6 files of 32
dots each, in place of the original 5 files. Dot size, spacing and density
does not change, but the index dot distribution within the data block is
different than the one shown in Figure 3 of proposal ED-CX-14 dated
10/7/69, Data Block location and film size (Figures 1 & 2 of proposal
ED-CX-14) did not change.
3. Required Modifications
The Reader will be capable of reading either 5 or 6 line data blocks
for each of the 9. 5" or 70 mm formats. The change from a 5 to 6 line format
will be under operator control, via front panel selectors. Incorporating
this feature will require the following additional tasks and equipment:
3. 1 Front Panel Control
Front panel selectors will be added to existing units. The selectors
will be designed so that a minimum of manual switching will be required
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Declassified in Part - Sanitized Copy Approved for Release 2012/10/24: CIA-RDP79B00873A001800020021-1
 Declassified in Part - Sanitized Copy Approved for Release 2012/10/24: CIA-RDP79B00873AO01800020021-1
3. 2 Data Block Locator
CONFilENT1AL
There will be no change in the data block locator for the 9. 5"
format. However, since in the 70 mm format the last files are read
first, and since those files are different for the 5 file and 6 file formats,
the locator will be designed to lock on either file under control of the front
panel selector.
3.3 Data Processor
The design of the data processor will be affected both by the
modification of the index bit locations and by the variation in the number
of files. The latter will increase the re=quired capacity of the recognition
logic to include the 6 file formats.
3.4 Error Detector
This section of the reader will be expanded to detect the, additional
files and their content. As the block locator, it too will be affected by the
image reversal in the 70 mm format,
3.5 Programmer
The number of programs controlling the reader is proportional to
the number of different formats. The programmer will therefore be doubled
due to the additional formats.
3.6 Buffer Storage
The control of the buffer storage will be changed to accomodate the
new formats, and still maintain a similarity in output format to minimize
the users computer programs.
Declassified in Part - Sanitized Copy Approved for Release 2012/10/24: CIA-RDP79B00873AO01800020021-1
 Declassified in Part - Sanitized Copy Approved for Release 2012/10/24: CIA-RDP79B00873AO01800020021-1
3.7 Debugging and Testing
CONFIDENTIAL
The time consumed by debugging and testing both at FSDS and at
the customer's facility will be increased due to the additional formats.
All test film will be supplied by the customer.
Declassified in Part - Sanitized Copy Approved for Release 2012/10/24: CIA-RDP79B00873AO01800020021-1