| Non printable ASCII character |
| Unaltered ASCII character |
| Modified ASCII character |
| Single-byte half-width katakana |
| First byte of a double-byte character, used by JIS X 0208 |
| Not used as first byte, unallocated space in JIS X 0208 |
| First byte of a double-byte IBM extension character |
| First byte of a double-byte IBM-designated user defined character |
| Not used as first byte |
| Second byte of a double-byte character whose first half of the JIS sequence was odd |
| Second byte of a double-byte character whose first half of the JIS sequence was even |
| Unused as second byte of a double-byte character |