> I did some quick calculations and came up with "less than 2.2k" for
> the pull-downs, so I used 1k. Is there any particular reason why you
> mention 470?

Only that you're using them with the MAX232.  If you can do the
whole thing with 10k / 1k) or 15k / 470R that does make purchases
a lot simpler, possibly cheaper if you can conglomerate into a 10+,
25+, whatever break point, and of course lessens the chance of a
stuffing mistake. None of the resistor values appear to be critical,
more ballpark

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