[Gllug] re: nice square pulses

[t.clarke]

I seem to recall reading somewhere that a perfect square wave can be considered
to be a composite of an infinite number of ascending harmonics, and thus travels
very badly down wires at high speed.   I also recall that this is the reason
why RS232C can only reach 115kbps or therabouts, whereas RS422 and later
can manage much higher rates 'cos the waveform is 'non-square'  (ie the rise
and fall times of the voltage at the start/end of the pulses is non-zero).

Tim

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