"A Hollerith string is a sequence of 12-bit characters; they are encoded as two ASCII characters, containing 6 bits each: the first character contains punches 12, 0, 2, 4, 6, 8 and the second character contains punches 11, 1, 3, 5, 7, 9; interleaving the two characters gives the original 12 bits. To make the characters printable on ASCII terminals, bit 7 is always set to 0, and bit 6 is set to the complement of bit 5. These two bits are ignored when reading Hollerith cards.
A device for translating a multi-bit input code into a desired multi-bit output code including a double-ended decoding circuit which converts the signals representing an input character into a single signal and apparatus which encodes this single signal into the signals representing a corresponding output character.
alphanumeric code: Simply a code that uses both letters of the alphabet and numbers.
12-bit: In binary (base 2) only 0 and 1 are used as count weight. Decimal (base 10) numbers 0 through 9 are used. A 12 bit decimal number is 100 000 000 000 and is read 100 Giga or one hundred thousand million. In binary 12 bit is 1000000000 and each place is a power of 2 so this number is 2^10 = 1024 decimal."
Si quelqu'un a une def en fr ça permettrait au non anglo mais matheux ou informaticiens d'aider.
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