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Tektronix Model 230 'Digital Unit'
The 230 appeared in one of the seminal computer cinema features: "Colossus: The Forbin Project". (Released in 1969)
The 230 'Digital Unit' apparently worked in conjunction with a Tektronix Type 568 oscilloscope, and generated digitized measurement data from the 'scope in BCD format which could be fed to an attached data logger or similar peripherals.
The unit was apparently still in production in 1971 as it appeared in the Tek catalog for that year.