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BLKLDR 1 is from the IMLAC; IML DEVICE archive file dated 1976-11-02. The archive was found in three identical copies on ToTS tapes 7006990, 701351, and 90606; they were extracted by Brad Parker. The BLKLDR 1 timestamp inside the archive is 1975-01-26. Tape database records from DM show a BLKLDR 4 dated 1974-08-19. To build the IMLAC; IMLAC BLKLDR file, it's first assembled with MIDAS. Regular IMTRAN writes the block loader format, but the block loader itself is in the "special TTY" boostrap format. IMTRAN is runtime patched to skip the block framing.