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On Tue, Jan 19, 2010 at 22:01, Andrii Zvorygin <[log in to unmask]> wrote:
> we have 8 keys,
> 2 sets of 4,
> for 256 combinations,
> can use time delay interrupt,
> or press space once letter selected.

I've seen chording used as a Braille entry method in a DOS Braille
editor -- using sdf for dots 3-2-1 and jkl for dots 4-5-6.

There, no special method was used to enter the character; you simply
pressed the appropriate keys together, and when you released them, the
appropriate character was added to the file. So, for example, sdfl
would give "v" -- dots-1236, looking a bit like an L. (The order of
characters does not matter, of course, and is effectively random; the
set of keys is what is important.)

Cheers,
Philip
-- 
Philip Newton <[log in to unmask]>