>You can reduce the error to zero for the usual serial
>rates by using a non-standard clock frequency of 3.6864
>MHz, or 2x or 4x that frequency.

Not quite sure why you class this crystal frequency as "non-standard". It is
a "standard" frequency simply because it is a baud rate generation standard
frequency. I had no trouble finding this crystal in a catalogue available as
an "off the shelf" item.

Another one that falls into this category is 19.6608MHz. You will find that
these two frequencies have a common divisor of 1.2288MHz.

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