The HARVEST computer (a.k.a. IBM 7950) was a one-of-a-kind cryptanalytic machine designed and built by IBM and the NSA in the late 1950s and early 1960s. In 2010, the NSA declassified a number of documents about HARVEST, revealing more of the machine's design and the planning process that led to it.
I focus more on HARVEST and its technical aspects, particularly its architecture and programming. However, some documents here corroborate other IBM Stretch historical work by Eric Smith and the notes from a Stretch/HARVEST Reunion in 2002.
If you are looking for more details on Stretch, Mark Smotherman's page is a great start.
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The documents are arranged chronologically, and named using the following scheme:
where FILE denotes where this document came from (usually a NARA File Unit Title), and TYPE is either JPEG or TIFF to denote the format of the scanned image. Any unknown or irrelevant values are set to zero. These are not all the available HARVEST documents from NARA. See the File Request Process below for a link to the relevant NARA page.