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by drfuchs
3975 days ago
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Close, but that only worked for punched paper tape (which had 7 positions for hole / not-hole per row, with a direct mapping to ASCII). Punch cards used Hollerith code, with 12 positions per column, with a peculiar mapping to EBCDIC, where there would be only one hole in rows 1 to 8, which more or less gave the bottom 3 bits of the character, and a combination of holes in the other 4 rows, giving the other 4 bits. |
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