Less common than EBCDIC or ASCII not now used but it was used in early IBM computers for internal storage of characters, although is can be used in bi-sync (see here).
| 0 | 1 | 2 | 3 | |
| 0 | SOH | & | - | 0 |
| 1 | A | J | / | 1 |
| 2 | B | K | S | 2 |
| 3 | C | L | T | 3 |
| 4 | D | M | U | 4 |
| 5 | E | N | V | 5 |
| 6 | F | O | W | 6 |
| 7 | G | P | X | 7 |
| 8 | H | Q | Y | 8 |
| 9 | I | R | Z | 9 |
| A | STX | SP | ESC | SYN |
| B | . | S | , | # |
| C | < | * | % | @ |
| D | BEL | US | ENQ | NAK |
| E | SUB | EOT | ETX | EM |
| F | ETB | DLE | HT | DEL |
