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meta bit

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meta bit n.

The top bit of an 8-bit character, which is on in character values 128--255. Also called high bit, alt bit. Some terminals and consoles (see space-cadet keyboard) have a META shift key. Others (including, mirabile dictu, keyboards on IBM PC-class machines) have an ALT key. See also bucky bits.

Historical note: although in modern usage shaped by a universe of 8-bit bytes the meta bit is invariably hex 80 (octal 0200), things were different on earlier machines with 36-bit words and 9-bit bytes. The MIT and Stanford keyboards (see space-cadet keyboard) generated hex 100 (octal 400) from their meta keys.

The Jargon File

Cartoons

The crunchly saga

The infamous Crunchly cartoons by The Great Quux are woven into the lexicon, each next to an appropriate entry. To read them in the sequence in which they were written, chase pointers from here using the ‘next cartoon’ information in the captions.