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Item 4109 - Apollo Guidance Computer Block II Yul System Revision Readout: 'Retread 44' Catalog 594 (Oct 2020)

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(we are no longer accepting bids on this item)
Minimum Bid: $200.00
Sold Price: $2,068.75 (includes buyer's premium)


Original printout of the assembly listing for the Apollo Guidance Computer program called "Retread 44," 304 pages, July 9, 1965, held within a contemporary 15.25″ x 11.5″ x 1″ binder, marked on the front: "BLK II Program 'Retread,' Silver's Copy, Dick Sheridan." The listing is headed "275690 YUL SYSTEM FOR BLK2: REVISION 0 OF PROGRAM RETRED44 BY NASA 2021100." In very good to fine condition, with general wear and creasing to a few pages.

According to the Virtual AGC Project, which scanned this document for archival purposes, this is the oldest-known still-surviving AGC code. At the time it was written in 1965, its purpose was to port AGC code written for the Command Module's early 'Block I' AGC to the later-model 'Block II' AGC used for the flown Lunar Module missions. The assembler for the AGC code was called "YUL," so named by Hugh Blair-Smith to commemorate the unmet Christmastime delivery date of a prototype guidance computer in 1959. From the Don Eyles Apollo Computer Collection.

Terms and abbreviations used in our descriptions.


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