As an alternative alphanumeric code, consider a code where punched holes in the columns of a card

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As an alternative alphanumeric code, consider a code where punched holes in the columns of a card represent alphanumeric codes. The punched hole represents a €œ1€; all other bits are €œ0€. The Hollerith code shown in Figure E4.2 is an example of such a code. This code has been used to represent a message on the card in Figure E4.3. Each row represents a code level from 0 to 12. Levels 12 and 11, which are not labeled on the card, are the top row and next-to-top rows, respectively. Each column represents a single character, so the card can hold one eighty-column line of text. (This card, prevalent in the 1960s and 1970s as a means of data input, is the reason that text-based displays are still limited to eighty characters per line.) Translate the card in Figure E4.3.

Figure E4.2

Punched Punched Punched Punched Punched Character Character Character Character Character code code code code code 11,3

Figure E4.3

00000 000 00000 00000000 00 00 00000000000000000000000000000000000000000 1 2 3 4 5 6 7 8 9 1011 121314 15 1617 181 29303

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