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IBM’s Harvest (IBM 7950) was a 1960s NSA‑dedicated streaming coprocessor attached to an IBM Stretch mainframe. It ran up to 200× faster than contemporary machines, used a custom bit‑addressable memory model, pipelined parallel streams (P, Q → R), and introduced the world’s first automated tape library. IBM also created a domain‑specific language, Alpha, for cryptanalytic programmers. The article…
