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7 bits ASCII localization ASCII: 1967 (USAS X3.4-1967) [3] [7] [6] 7 bits Close to "modern" definition of ASCII Transcode: 1967 7 bits IBM data transmission terminal 2780, 3780: Recommendation V.3 IA5: 1968 7 bits MARC-8: 1968 7 bits Library computer systems Braille ASCII: 1969 6/7 bits Tactile print for blind persons JIS X 0201: 1969 6/7 bits
In particular, the Teletype Model 33 machine assignments for codes 17 (Control-Q, DC1, also known as XON) and 19 (Control-S, DC3, also known as XOFF) became de facto standards. [ 33 ] The programming language BASIC was designed to be written and edited on a low-speed Teletype Model 33.
ASCII was incorporated into the Unicode (1991) character set as the first 128 symbols, so the 7-bit ASCII characters have the same numeric codes in both sets. This allows UTF-8 to be backward compatible with 7-bit ASCII, as a UTF-8 file containing only ASCII characters is identical to an ASCII file containing the same sequence of characters.
Code 127 (DEL, a.k.a. "rubout") is likewise a special case. Its 7-bit code is all-bits-on in binary, which essentially erased a character cell on a paper tape when overpunched. Paper tape was a common storage medium when ASCII was developed, with a computing history dating back to WWII code breaking equipment at Biuro Szyfrów. Paper tape ...
The machine generated the appropriate Morse code point from the key press. An entirely new type of code was developed by Émile Baudot, patented in 1874. The Baudot code was a 5-bit binary code, with the bits sent serially. Having a fixed length code greatly simplified the machine design.
The German standard DIN 66003, also known as Code page 1011 (CCSID 1011; abbreviated CP1011) by IBM, [1] [2] Code page 20106 (abbreviated CP20106) by Microsoft [3] and D7DEC by Oracle, [4] is a modification of 7-bit ASCII with adaptations for the German language, replacing certain symbol characters with umlauts and the eszett.
It contains standard 7-bit ASCII codes, and Japanese characters are indicated by the high bit of the first byte being set to 1. Some code points in this page require a second byte, so characters use either 8 or 16 bits for encoding.
The popular Teletype Model 33 used 7-bit ASCII code (with an eighth parity bit) instead of Baudot. The common modem communications settings, Start/Stop Bits and Parity, stem from the Teletype era. In early operating systems such as Digital's RT-11 , serial communication lines were often connected to teleprinters and were given device names ...