"Harvest was one of the first machines designed to apply operations to enormous [streaming] datasets ... one of the first machines built as an add-on—a specialized helper intended to do one job exceptionally well, bolted on to a general computer [a cryptographic coprocessor in today's parlance] ... [and it used] the world's first automated tape library that could robotically fetch any one of hundreds of cassettes of magnetic tape" and it had a customer programming language (Alpha), designed specifically for cryptanalysis.