ascii(7) on OpenBSD
The text e1ed1a0a834b, as OpenBSD 7.6, OpenBSD 7.5, OpenBSD 7.4, OpenBSD 7.3, OpenBSD 7.2, OpenBSD 7.1, OpenBSD 7.0, OpenBSD 6.9, OpenBSD 6.8, OpenBSD 6.7, OpenBSD 6.6 shipped it.
octal, hexadecimal and decimal ASCII character sets