In computing FOCAL character set refers to a group of 8-bit single byte

character set Character encoding is the process of assigning numbers to graphical characters, especially the written characters of human language, allowing them to be stored, transmitted, and transformed using digital computers. The numerical values that ...

s introduced by Hewlett-Packard since 1979. It was used in several RPN

calculator An electronic calculator is typically a portable electronic device used to perform calculations, ranging from basic arithmetic to complex mathematics. The first solid-state electronic calculator was created in the early 1960s. Pocket-sized ...

s supporting the FOCAL programming language, like the

HP-41C The HP-41C series are programmable, expandable, continuous memory handheld RPN calculators made by Hewlett-Packard from 1979 to 1990. The original model, HP-41C, was the first of its kind to offer alphanumeric display capabilities. Later came ...

/ CV/ CX as well as the later

HP-42S The HP-42S RPN Scientific is a programmable RPN Scientific hand held calculator introduced by Hewlett Packard in 1988. It has advanced functions suitable for applications in mathematics, linear algebra, statistical analysis, computer science an ...

, which was introduced in 1988 and produced up to 1995. As such, it is also used by SwissMicros' DM41/ L, both introduced in 2015, and is implicitly supported by the DM42, introduced in 2017 (although the later calculator utilizes

Free42 The HP-42S RPN Scientific is a programmable RPN Scientific hand held calculator introduced by Hewlett Packard in 1988. It has advanced functions suitable for applications in mathematics, linear algebra, statistical analysis, computer science a ...

, which is based on Unicode internally).

Character set

The character set is derived from

ASCII ASCII ( ), abbreviated from American Standard Code for Information Interchange, is a character encoding standard for electronic communication. ASCII codes represent text in computers, telecommunications equipment, and other devices. Because of ...

, but with the control code range and some high bit characters replaced by various special characters. When Hewlett-Packard introduced the

in 1988, the FOCAL character set was revised to include more characters, including a number of characters already provided by the HP 82240A infrared thermo printer, which had been introduced in 1986, as part of its extended variant of the 1985 revision of the

HP Roman-8 In computing HP Roman is a family of character sets consisting of HP Roman Extension, HP Roman-8, HP Roman-9 and several variants. Originally introduced by Hewlett-Packard around 1978, revisions and adaptations were published several times up ...

character set, although at completely different code points. There is no code point definition for the euro sign in this character set. Translation from HP-42S character set to the

modified HP Roman-8 In computing HP Roman is a family of character sets consisting of HP Roman Extension, HP Roman-8, HP Roman-9 and several variants. Originally introduced by Hewlett-Packard around 1978, revisions and adaptations were published several times up ...

(supported by

HP 82240A HP may refer to: Businesses and organisations * HP Inc., an American technology company ** Hewlett-Packard, the predecessor to HP Inc. * HP Foods ** HP Sauce, formerly made by HP Foods * Handley Page, an aircraft company * Hindustan Petroleu ...

etc.) character set:

Character set

See also

Notes

References

Further reading