| bits | letter mode | figure mode |
|---|---|---|
| 00000 | null | null |
| 00001 | E | 3 |
| 00010 | line feed | line feed |
| 00011 | A | - |
| 00100 | space | space |
| 00101 | S | '/bell |
| 00110 | I | 8 |
| 00111 | U | 7 |
| 01000 | c.r. | carriage return |
| 01001 | D | who are you?/$ |
| 01010 | R | 4 |
| 01011 | J | bell/' |
| 01100 | N | , |
| 01101 | F | ! |
| 01110 | C | : |
| 01111 | K | ( |
| 10000 | T | 5 |
| 10001 | Z | + |
| 10010 | L | ) |
| 10011 | W | 2 |
| 10100 | H | £/# |
| 10101 | Y | 6 |
| 10110 | P | 0 |
| 10111 | Q | 1 |
| 11000 | O | 9 |
| 11001 | B | ? |
| 11010 | G | & |
| 11011 | figure shift | undefined |
| 11100 | M | . |
| 11101 | X | / |
| 11110 | V | = or ; |
| 11111 | undefined | letter shift/delete |
E A SIU DRJNFCKTZLWHYPQOBG MXV
3 87 4 5 2 6019
- ' ,!:( +) # ?& ./=
ABCDEFGHIJKLM
the bletchley park single-case codeset has the letters as usual and the following changes:
Symbols in ASCII order: !#&'()+,-./0123456789:=? ABCDEFGHIJKLMNOPQRSTUVWXYZ
Unambiguous symbol set, used in every variant: !&'(),-./:?
(except the Cyrillic variant of course, which lacks !&', and between US and European teletypes the codes for bell and apostrophe are swapped: 01011 for apostrophe in US TTYs).
US teletypes additionally use the semicolon at 11110, where pure ITA2 has the equals sign.
posted 2018-02-19, updated 2022-04-11 | index