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Standard Telex ITA-2 →
Russian Baudot
MTK-2 is a variant of the ITA-2 standard,
which adds support for the Cyrillic alphabet.
This is done by introducing a third shift character 'RUS'
— the other two being the Letter- and Figure-shift.
It replaces the NULL code (000·00) of the ITA-2 alphabet, which is no longer
available.
Normal text consists of over 50 different characters (26 letters,
10 numbers, 10 punctuation marks and some control codes).
In the ITA2 standard, 5 bits are used to represent a character, which
means that only 32 different codes can be created (25).
As this is insufficient for normal text, most codes
are used three times (i.e. have 3 different meanings) and special
reserved codes
are used to shift between the sets,
known as Letters (LTRS), Figures (FIGS) and Cyrillic (RUS).
The letters of the Cyrillic alphabet are mapped onto their Latin
equivalent were possible. As Cyrillic has more characters than the Latin
alphabet – typically 33 instead of 26 – five figures have been
replaced by Cyrillic letters. The Russian symbol ' Ъ ' is discarded,
whilst ' Ë ' is replaced by ' E '.
The Cyrillic alphabet is selected with the former NULL code (000·00),
and is deselected by pressing FIGS (110·11) or LTRS (111·11).
CR, LF and SPACE are common to all alphabets.
LTRS-shift is represented by 111·11 (5 holes), so that it can be
used to wipe part of a paper tape, without affecting the rest.
Normally, a paper tape would start with two LTRS characters, to ensure
that the teletype is in Letters-mode.
By convention, the holes (bits) in the tape are called channels
or tracks and the tape is shown as it runs through the reader
away from you.
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| # | Ltr | Fig | Rus | Hex | Bin | Remark |
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| 0 | RUS | 00 | 000·00 | Cyrillic shift |
| 1 | E | 3 | Е | 01 | 000·01 | |
| 2 | LF | 02 | 000·10 | Line Feed (new line) |
| 3 | A | - | А | 03 | 000·11 | |
| 4 | SP | 04 | 001·00 | Space |
| 5 | S | ' | С | 05 | 001·01 | |
| 6 | I | 8 | И | 06 | 001·10 | |
| 7 | U | 7 | У | 07 | 001·11 | |
| 8 | CR | 08 | 010·00 | Carriage Return |
| 9 | D | Ч | Д | 09 | 010·01 | Was: ENC (who are you?) |
| 10 | R | 4 | Р | 0A | 010·10 | |
| 11 | J | Ю | Й | 0B | 010·11 | Was: BELL |
| 12 | N | , | Н | 0C | 011·00 | |
| 13 | F | Э | Ф | 0D | 011·01 | Was: exclamation mark |
| 14 | C | : | Ц | 0E | 011·10 | |
| 15 | K | ( | К | 0F | 011·11 | |
| 16 | T | 5 | Т | 10 | 100·00 | |
| 17 | Z | + | З | 11 | 100·01 | |
| 18 | L | ) | Л | 12 | 100·10 | |
| 19 | W | 2 | В | 13 | 100·11 | |
| 20 | H | Щ | Х | 14 | 101·00 | Was: currency symbol |
| 21 | Y | 6 | Ы | 15 | 101·01 | |
| 22 | P | 0 | П | 16 | 101·10 | |
| 23 | Q | 1 | Я | 17 | 101·11 | |
| 24 | O | 9 | О | 18 | 110·00 | |
| 25 | B | ? | Б | 19 | 110·01 | |
| 26 | G | Ш | Г | 1A | 110·10 | Was: & or @ |
| 27 | FIGS | 1B | 110·11 | Figures (Shift on) |
| 28 | M | . | М | 1C | 111·00 | |
| 29 | X | / | Ь | 1D | 111·01 | |
| 30 | V | ; | Ж | 1E | 111·10 | |
| 31 | LTRS | 1F | 11·111 | Letters (Shift off) |
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© Crypto Museum. Created: Tuesday 20 January 2015. Last changed: Thursday, 25 September 2025 - 09:08 CET.
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