The telegraphic three-register code MTK-2 was adopted in the USSR in 1963. The code is 5- bit (32 different combinations in total), so 3 different registers (Russian, Latin, digits) are used, switched by control characters RUS, LAT, DIG. There are no letters b and b; instead of the letter H, the number 4 was used.
| Hexadecimal code | Decimal code | Binary code | Letters | Russian letters | Figures |
|---|---|---|---|---|---|
| 0x03 | 3 | 11000 | A | BUT | - |
| 0x19 | 25 | 10011 | B | B | ? |
| 0x0E | 14 | 01110 | C | Ts | : |
| 0x09 | 9 | 10010 | D | D | Who's there? |
| 0x01 | one | 10,000 | E | E | 3 |
| 0x0D | 13 | 10110 | F | F | E |
| 0x1A | 26 | 01011 | G | G | W |
| 0x14 | 20 | 00101 | H | X | U |
| 0x06 | 6 | 01100 | I | AND | eight |
| 0x0B | eleven | 11010 | J | Th | YU |
| 0x0F | 15 | 11110 | K | TO | ( |
| 0x12 | 18 | 01001 | L | L | ) |
| 0x1C | 28 | 00111 | M | M | . |
| 0x0C | 12 | 00110 | N | N | , |
| 0x18 | 24 | 00011 | O | ABOUT | 9 |
| 0x16 | 22 | 01101 | P | P | 0 |
| 0x17 | 23 | 11101 | Q | I | one |
| 0x0A | ten | 01010 | R | R | four |
| 0x05 | five | 10100 | S | WITH | '' |
| 0x10 | sixteen | 00001 | T | T | five |
| 0x07 | 7 | 11100 | U | At | 7 |
| 0x1E | thirty | 01111 | V | F | = |
| 0x13 | nineteen | 11001 | W | AT | 2 |
| 0x1D | 29th | 10111 | X | B | / |
| 0x15 | 21 | 10101 | Y | S | 6 |
| 0x11 | 17 | 10001 | Z | 3 | + |
| 0x08 | eight | 00010 | Carriage return | ||
| 0x02 | 2 | 01000 | Line translation | ||
| 0x1F | 31 | 11111 | Latin letters | ||
| 0x1B | 27 | 11011 | Figures | ||
| 0x04 | four | 00100 | Space | ||
| 0x00 | 0 | 00000 | Russian letters | ||
MTK-2 is based on International Telegraph Code No. 2 ( ITA2 ), recommended by the International Telephony and Telegraphy Advisory Committee in 1932 (not used in international code 00000).
The correspondence between the English and Russian registers adopted in MTK-2 was used to create computer codes KOI-7 and KOI-8 .