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Questions tagged [ascii]

For questions about the 7-bit ASCII character set, including its control codes. Not for binary-coded-decimal (even if some Intel instructions call it "adjust for ASCII").

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3answers
255 views

What characters which were in use at the time were excluded from ASCII?

The American Standard Code for Information Interchange is a 7-bit character encoding. Work on the standard began in 1960 and the first edition was published in 1963. The standard attempted to ...
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2answers
2k views

Why are the symbols on the number keys of PC & Mac keyboards different to ASCII keyboards?

On a US-layout PC keyboard, the symbols above the number keys are as follows: Whereas the keyboard on an Apple II is different: Note, for example, the '(' and ')' symbols are now above 8 and 9, and '...
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4answers
6k views

History of Ctrl-S and Ctrl-Q for flow control

Which OS was the first to use Ctrl-S and Ctrl-Q on the console for pause and continue? I first discovered Ctrl-S in IBM PC DOS 1.1.
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1answer
337 views

What's the deal with System/360's “USASCII” mode?

The original System/360 architecture had a bit in the Program Status Word that would select an "USASCII" mode rather than the usual EBCDIC. Setting this bit changed how the BCD arithmetic operations ...
32
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5answers
4k views

Executable ASCII files before x86?

I've known about a technique allowing to bootstrap arbitrary 16-bit x86 code from a subset of instructions representable as printable ASCII bytes since the early 1990s. The first example of an ASCII ...
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2answers
281 views

What file systems / encapsulation formats used ASCII?

Most of the ASCII character codes make sense in the context of data transmission, e.g. ␄, ␗, ␖ (end of transmission, end of transmission block, synchronisation). However, there are also codes such as ␜...