IBM

PUNCH CARD DECODER

80-Column Hollerith Card — IBM 029 Keypunch — 100% Client-Side

READY

DROP CARD IMAGE HERE

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Card preview

DECODING CARD…

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> DECODED OUTPUT

> CARD GRID

> COLUMN DETAIL

IBM 029 Keypunch Encoding • 80 Columns × 12 Rows • Hollerith Code • Ctrl+S to save for offline use

by exec · built with Claude Code