> The crystal he is using is probably cheaper than a 4MHz one because
> it is a TV colour burst frequency for US TV sets

3.579545 is surprisingly common on digital boards with counters like
the 4060, as well as DTMF ICs. Even on complex boards, stuffed full
of exotic chips, where you think no expense is spared, it's still way the
most common in the 4MHz-ish range. I've stripped dozens off a wide
variety of PCBs

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There are some 3.58MHz here with the MC145443 300-baud modem
IC (1995 vintage). I have a feeling these are used for some sort of inter-
board comms and would like to find a use for them in a PIC context,
but they must be a bit old hat now eh ?

http://www.datasheetdir.com/MC145443+Interface

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wbr
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