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Overview
A Punch Card Time Recorder is a traditional time-tracking device used by businesses to record employee attendance. It operates by allowing employees to insert a paper card (punch card) into the machine, which then stamps the exact date and time of entry or exit.
Product Name: Punch Card
General Specification
1. Physical Dimensions:
2. Data Encoding:
- Material: Stiff paper or thin cardboard.
- Size: Standard punch cards were typically 7.375 inches (187.325 mm) wide and 3.25 inches (82.55 mm) tall.
- Thickness: Around 0.178 mm to 0.215 mm.
2. Data Encoding:
- Hole positions: Each card has an array of fixed rows and columns where holes can be punched to represent data.
- Columns: Typically, there are 80 columns across the width of the card.
- Rows: Each column had 12 possible positions (usually numbered 0–9 and two additional top positions called "X" and "Y" or 11 and 12).
- Binary system: Holes were punched in a binary fashion (either punched or not punched), encoding data or instructions.
