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Paper tape was an early digital computer data storage and input medium consisting of a continuous strip of paper with holes punched in a specific pattern to represent binary data, which was then read by mechanical or optical readers. Used from the 19th century to the mid-20th century in various applications, including teleprinters and early computers, paper tape stored programs and data until it was largely replaced by magnetic tape and other media.

Components and How It Works

Paper Tape: A continuous strip of paper with small, strategically placed holes.

Punched Holes: These perforations serve as the binary digits, or "bits," representing data or instructions. Holes are present for data, while the absence of a hole is also significant.

Sprocket Holes: Additional small holes along the tape provide a mechanism for the tape reader to grip and advance the tape accurately.

Tape Reader: A device that detects the pattern of holes.

Mechanical Readers: Used pins that extended through the holes to trigger electrical connections.

Optical Readers: Utilized a light source and a light sensor to detect holes by sensing light passing through the perforations.