By P. E. Gosling

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EBCDIC Punch Code I 12 ,11. 0,3,8. 0,4,8. 0,5,8. 0,6,8. 0,7,8. 2,8. 3,8. 4,8. 5,8. 6,8. 7,8. a b c d e f g 1. 0. 2. 0. 3,12,0. 4. 0. 5,12,0. 6,12,0. 7,12,0. h 8,12. 0. 9,12,0. 1. 12. 11. 2. 12,11,3. 12,11,4. 12. 11, 5. 12,11,6. m n 0 p q r t u v w X y 12,11,7. 12,11,8. 12,11,9. 11,0, 2. 11,0,3. 11,0,4. 5. 6. 11 ,0. 7. 11 ,0,8. ASCII Char. ASCI I Punch Code Codes for Computers and Microprocessors 54 Binary Code 10101001 10101010 10101011 10101100 10101101 10101110 10101111 10110000 10110001 10110010 10110011 10110100 10110101 10110110 10110111 10111000 10111001 10111010 10111011 10111100 10111101 10111110 10111111 11000000 11000001 11000010 II 000011 11000100 11000101 11000110 11000111 11001000 11001001 11001010 11001011 11001100 11001101 11001110 11001111 11010000 11010001 11010010 11010011 11010100 11010101 11010110 ·11010111 11011000 11011001 11011010 11011011 11011100 11011101 11011110 11011111 11100000 11100001 11100010 11100011 11100100 11100101 11100110 11100111 11101000 Decimal Equiv.

With half-duplex two or four wires are needed. (3) Duplex transmission of information in both directions at once. For the procedures of data communication separate rules are drawn up regarding the protocol that must be observed when communications are exchanged. It is for this reason that we have a series of control characters. A list of these characters and their meanings follows. 2 PARITYCHECKING Parity checking is a simple way to detect mistakes in data transmission. If a code contains an even number of 1s we have even parity, as we have already seen with certain punch tape codes.

L--,1--,1 The MSB can be used as a sign bit, as with floating point representation, 0 for positive and 1 for negative. For positive numbers the remaining 15 bits represent the size of the number and for negative numbers the 2's complement is used for the size of the number. We have also seen that a direct binary-octal conversion is very simple and so our 16-bit word can be considered as containing six octal digits. The largest positive number capable of being stored in a 16-bit word arranged in this fashion is I oi1111111III1I111I111I or, in the octal representation 1 o \777771 and this number is, in fact, 32767 10 .

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