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The software is encoded on tape as a sequence of pulses that sound similar to the noises made by a modem. Since the Spectrum has only a rudimentary tape interface, data is recorded using an unusually simple and very reliable modulation: similar to pulse-width modulation but without a constant clock rate. Pulses of different widths (durations ...
Notice that the tab at the start of a line is removed outside <pre>, the eight-character spacing, and how a tab stop is skipped if there are more than eight characters since last one. CSS3 defines tab-size property, which adjusts the number of spaces for the tab character from the default of eight. [ 11 ]
Non-breaking space (°) is a space character that prevents an automatic line break at its position. Pilcrow (¶) is the symbolic representation of paragraphs. Line break (↵) breaks the current line without new paragraph. It puts lines of text close together. Tab character (→) is used to align text horizontally to the next tab stop.
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 became obsolete in the 1970s, so this clever aspect of ASCII ...
The built-in routines for storing and reading data to and from Compact Cassette tapes were made for safe storing rather than speed. Better tape quality in the 1980s made it possible to store data more effectively, reducing loading time and tape length. Such programs existed for several computers, such as the Ohio Scientific Challenger. [20]
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The various looping and conditional constructs (which made TECO Turing-complete) were included in order to provide sufficient descriptive power for the correction tape. The terse syntax minimized the number of keystrokes needed to prepare the correction tape. The correction tape was a program, and required debugging just like any other program.