At 03:29 PM 7/11/00 +1000, you wrote:
>G'day Tony,
>
>I've "heard" 10% of frequency.  However I've also met devices which
>could not cope with more than about 5% in one particular direction.
>I vaguely recall a specification ... but if it exists it also implies
>that there are implementations which do not comply.  ;-}

The 10% comes about in that if you're 10% off on bit timing, then by the
end of 10 bits, you're off by a whole bit.
Fatal error.

The receiving device also has it's own idea of what 9600 baud (or whatever)
is, and may be of by a suprising amount.

I don't think there's so much a specification as just the limitations of
physics.
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