These tables give the character and internal code associated with each 7-track punching. For a complete specification of Atlas Internal Code, see CS 348A, section 8.2 and Appendix D; it is a 6-bit 2-set code, each character being written as 2 octal digits, and the sets being called inner set and outer set. Carriage control characters (newline and paper throw) do not have internal codes; see CS348A, section 8.3.
Tape punching Upper Case Lower Case
character internal code character internal code
O . SP ** 01 SP ** 01
. O (unassigned) ** 00 (unassigned) ** 01
. O NL NL
O . OO PT PT
.O TB IS 02 TB IS 02
O .O O BS IS 03 BS IS 03
O .OO LC ** 06 LC ** 06
.OOO UC ** 07 UC ** 07
O. (unassigned) OS 10 (unassigned) OS 10
OO. O (unassigned) OS 11 (unassigned) OS 11
OO. O (unassigned) OS 12 (unassigned) OS 12
O. OO (unassigned) OS 13 (unassigned) OS 13
OO.O ST OS 14 ST OS 14
O.O O PN OS 15 PN OS 15
O.OO PF OS 16 PF OS 16
OO.OOO / IS 17 : OS 17
O . 0 IS 20 ' IS 40
OO . O 1 IS 21 [ OS 21
OO . O 2 IS 22 ] OS 22
O . OO 3 IS 23 < IS 32
OO .O 4 IS 24 > IS 33
O .O O 5 IS 25 = IS 34
O .OO 6 IS 26 UL OS 26
OO .OOO 7 IS 27 ' OS 27
OOO. 8 IS 30 ( IS 10
O O. O 9 IS 31 ) IS 11
O O. O 10(α) OS 32 %(2) OS 30
OOO. OO 11(β) OS 33 £(π) IS 13
O O.O ½ OS 34 ? IS 14
OOO.O O + IS 35 & IS 15
OOO.OO - IS 36 * IS 16
O O.OOO . IS 37 , IS 12
Tape punching Upper Case Lower Case
character internal code character internal code
O . (unassigned) OS 37 (unassigned) OS 40
O O . O A IS 41 a OS 41
O O . O B IS 42 b OS 42
O . OO C IS 43 c OS 43
O O .O D IS 44 d OS 44
O .O O E IS 45 e OS 45
O .OO F IS 46 f OS 46
O O .OOO G IS 47 g OS 47
O OO. H IS 50 h OS 50
O O. O I IS 51 i OS 51
O O. O J IS 52 j OS 52
O OO. OO K IS 53 k OS 53
O O.O L IS 54 l OS 54
O OO.O O M IS 55 m OS 55
O OO.OO N IS 56 n OS 56
O O.OOO O IS 57 o OS 57
OOO . P IS 60 p OS 60
OO . O Q IS 61 q OS 61
OO . O R IS 62 r OS 62
OOO . OO S IS 63 s OS 63
OO .O T IS 64 t OS 64
OOO .O O U IS 65 u OS 65
OOO .OO V IS 66 v OS 66
OO .OOO W IS 67 w OS 67
OO O. X IS 70 x OS 70
OOOO. O Y IS 71 y OS 71
OOOO. O Z IS 72 z OS 72
OO O. OO (unassigned) IS 73 (unassigned) OS 73
OOOO.O (unassigned) IS 74 (unassigned) OS 74
OO O.O O (unassigned) IS 75 (unassigned) OS 75
OO O.OO ES IS 76 ES OS 76
OOOO.OOO ER OS 77 ER OS 77
1. Characters in parentheses are alternatives on different sets of equipment.
2. Abbreviations used are:
SP space BS backspace PN punch on NL newline LC lower case PF punch off PT paper throw UC upper case UL underline TB tabulate ST stop ER erase ES escape IS inner set OS outer set
3. The designation (unassigned) indicates that the punching has no printed character associated with it.