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Standard for bit-paired keyboard layout From Wikipedia, the free encyclopedia
ECMA-23 is a standard for a bit-paired keyboard layout adopted in 1969 and revised in 1975. As a bit-paired layout, shifted keys correspond to toggling bits in the ASCII keycode. This is most visible in the digits on the top row, where shifting 6789 give &'(), and ;+, :* and -= are paired.
The ECMA-23 layout has two options, being the same as the ISO 2530 or the ANSI-X4.14 bit-paired layout.
In the UK, ECMA-23 layout keyboards were used on most 8-bit computers such as the Acorn BBC computers and the earlier Atom and Systems, the Amstrad CPC series, and (to an extent) the ZX Spectrum. While bit-paired layouts have generally given way to typewriter layouts it remains as the Japanese keyboard layout.
The most common layouts are:
Acorn Atom and Acorn System[1] | ECMA23/ANSI | : ^ \ [ ] shuffled |
RS2376 keyboard[2] | ECMA23/ISO | character 96 generated with Shift-@ |
BBC Microcomputer series[3] | ECMA23/ANSI | character 96 as £ generated with Shift-_ |
Amstrad CPC[4] | ECMA23/ANSI | :* and ;+ swapped, \ moved, Shift-\ and Shift-@ swapped, DELETE in the ← Backspace location |
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