1、International Standard - only one of the positions 1, 2, 3, 4, 5, 6, 7 may be punched, which together with the NO PUNCH condition gives eight possibilities. These rules provide for 256 hole patterns (32 x 8). 4 Specification 4.1 Implementation of the 8-Bit coded character set Table 1 specifies for e
2、ach of the 256 8-bit combinations the corresponding hole-pattern. The columns and rows are numbered in binary and decimal notation. Each position in table 1 is identified by its column and row number (for example 06/11) and by the corresponding bit combination (for example 0110 1011, where the most
3、signifi- cant bit is on the left). 4.2 Implementation of the 7-Bit coded character set The hole-patterns shown in the first half of table 1 (i.e. columns 00 to 07) apply to the 128 7-bit combinations, which are obtained ignoring the most significant eighth bit (bs). Punching r positions Top 1 -12- -
4、ll- _ _ _ o- _ I_ _ _ _ 2- _ _ _ 3- _ _ _ 4- _ _ _ 5- _ _ _ 6-m- Punching _ _ _ 7- / columns _ _ _ 8-e- _ gee- 1 2 3 4 5 6 7 8 9 10 11 12 13 . . . -Bottom Figure - Layout of punching positions 2 IS0 6666-1960 (E) TI rF t- k 0 4 0 + 0 0- : 0- 0- 0- 0 C 0 c 0 C 1 O0 D” A -I- -!- 0 I 0- O0 I 0 0- O0 1
5、C 0- t OC c t 0- -T OC ri 9” d IS0 6666-1960 (El Annex (Not part of the International Standard) For ease of reference, and with a view to helping the reader, the correspondence defined in table 1 between 256 8-bit combinations and 256 hole-patterns, is shown hereafter in another form in table 2. The
6、 layout of table 2 is as follows : - the columns, the left half of the rows and the right half of the rows are labelled with card hole-patterns. - the entries in the table represent the column/row position of a bit-combination of the 8-bit code table. Table 2 - Bit-combinations assigned to card hole
7、 patterns n 12 n II c 0 0 12 n I1 02j 6 02/13 1 03/ 0 02/ 0 07,ll 1 1 IO7/12 1 07/13 1 ll/lO 12/10 13/ 1 lO/ 9 09/15 lO/lO ll/ 2 lO/ll ll/ 3 10/12 ll/ 4 10/13 llj 5 lo/l4 ll/ 6 10/15 ll/ 7 13/ 8 ll/ll 11/12 - 1 l/13 1 l/14 1 l/15 12/ 0 12/ 1 06/10 1 07/14 / 13/ 9 C 1 II c 3 C 4 _ c 5 iI C 7 04/ 1 04
8、/10 04/ 2 04/11 04/ 3 04/12 04/ 4 04/13 04/ 5 04/14 04/ 6 04/15 04/ 7 05/ 0 04/ 8 05/ 1 02/15 03/ 1 06/ 1 05/ 3 03/ 2 OS/ 2 05/ 4 03/ 3 OS/ 3 05/ 5 03/ 4 06/ 4 05/ 6 03/ 5 06/ 5 05/ 7 03/ 6 06/ 6 05/ 8 03/ 7 06/ 7 05/ 9 03/ 8 06/ 8 06/11 1 07/ 3 1 13/10 06/12 ) 07/ 4 1 13/l 1 06/13 1 07/ 5 1 13/12 I
9、 I I I 06/14 1 07/ 6 1 13/13 06/15 1 071 7 ( 13/14 08/ 6 07/ 0 1 07/ 8 ( 13/15 0 a I n 9 nn 8 2 I ia 3 nc 07/ 1 1 07/ 9 1 14/ 0 12/ 2 09/ 0 15/o 04/ 9 05/ 2 I 05/10 03/ 9 06/ 9 07/ 2 07/l 0 14/ 1 -I I I 1-1 08/l 3 Ol/ 9 1 08/ 9 I%/oo/ o 05/11 05/13 I 05/12 I03/10 ) 12/ 4 1 12/11 1 13/ 2 / 14/ 2 08/1
10、4 09/ 2 (08/10109/l; 14;8- I 02/14 02/ 4 I 02/12 Io2/ 3 1 12/ 5 1 12/12 1 13/ 3 1 14/ 3 OO/ll 08/15 08/11 09/11 14/ 9 14/15 15/ 5 I I I I I I 15/11 15/12 nn a 4 F nci a 5 03/12 02/10 I 02/ 5 04/ 0 / 12/ 6 1 12/13 1 13/ 4 1 14/ 4 00/12 01/12 08/12 Ol/ 4 14/10 , 15/ 0 15/ 6 1 1 ( 1 I I 02/ 8 02/ 9 I 05/15 DO/13 01/13 oo/ 5 Ol/ 5 14/11 15/ 1 15/ 7 I I I I I I 15/13 , 9 a cn 02/l 1 I 03/l 1 02/ 1 05/14 I 03/14 03/13 1 ( 12/ 8 1 12/15 1 13/ 6 1 14/ 6 15/ 2 15/ 8 I 15/14 D!d a 7 03/15 Io2/ 2 1 12/ 9 1 13/ 0 1 13/ 7 1 14/ 7 15/15
