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Six-bit codes could encode more than 64 characters by the use of [[Shift Out and Shift In characters]], essentially incorporating two distinct 62-character sets and switching between them. For example, the popular [[IBM 2741]] communications terminal supported a variety of character sets of up to 88 printing characters plus control characters.
===Teletypesetter code===
{{main|Teleprinter#Teletypesetter|Telegraph code#TeleTypeSetter}}
A special 6-level extension of the 5-level [[International Telegraph Alphabet]] was used to remotely control [[Linotype machine]]s beginning around 1930. By 1950 it was widely used by [[wire service]]s to send preformatted news stories to participating newspapers. It supported the 90 [[printable character]]s characters of a Linotype machine, plus [[whitespace character]]s.
The TTS code had two pairs of shift codes allowing a total of four shift states. The first operated much like a keyboard's shift key and selected between a lower-case and digits repertoire, and an upper-case and symbols one. A second pair of Linotype-specific "lower rail" and "upper rail" shift codes would select an alternate (usually italic) font.
===BCD six-bit code===
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