> I have found that good quality decade resistance substitution
> boxes and decade capacitance substitution boxes in
> conjunction with a good scope will resolve most RC circuit
> concerns very quickly.

Granted, but not everyone has access to those. Looking
through data books of other micros I use, RC seems to be
quite a neglected feature. Only the book for the Motorola
68HH705K1 (which I used a lot before the F84) goes into
RC in any detail, including an RC v freq graph. No other
Mot I'm aware of has RC. The Zilog Z8 books merely say
that RC or even LC can be used, AVRs I'm familiar with
don't have either RC or internal oscs (except for WDT). I
wonder how many people actually even consider RC as
an option and needlessly spend money on crystals or
resonators. If they were more aware of RC and had an
accurate way (on paper) of determining values perhaps
RC would be first choice. I have to admit I myself tend to
reach for the crystal box rather easily

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