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.
We use cookies on this site to improve your experience. By using this site, you accept our use of cookies. To learn more, please see our Privacy Policy.